Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2024

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from to

Commission File Number: 001-34949

ARBUTUS BIOPHARMA CORPORATION

(Exact Name of Registrant as Specified in Its Charter)


British Columbia, Canada						98-0597776
(State or Other Jurisdiction of						(I.R.S. Employer
Incorporation or Organization)						Identification No.)

701 Veterans Circle, Warminster, PA 18974

(Address of Principal Executive Offices and Zip Code)

267-469-0914

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Shares, without par value	ABUS	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

Accelerated filer

Non-accelerated filer

Smaller reporting company

Emerging growth company

☐

☒

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No ☒

As of November 5, 2024, the registrant had 189,491,685 common shares, without par value, outstanding.

ARBUTUS BIOPHARMA CORPORATION


		Page

PART I. FINANCIAL INFORMATION		1
ITEM 1.	FINANCIAL STATEMENTS (UNAUDITED)	1
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	18
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	35
ITEM 4.	CONTROLS AND PROCEDURES	35

PART II. OTHER INFORMATION		37
ITEM 1.	LEGAL PROCEEDINGS	37
ITEM 1A.	RISK FACTORS	39
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	39
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	39
ITEM 4.	MINE SAFETY DISCLOSURES	39
ITEM 5.	OTHER INFORMATION	39
ITEM 6.	EXHIBITS	40

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS (UNAUDITED)

ARBUTUS BIOPHARMA CORPORATION

Condensed Consolidated Balance Sheets

(Unaudited)

(In thousands of U.S. Dollars, except share amounts)


	September 30, 2024		December 31, 2023
Assets
Current assets:
Cash and cash equivalents	$	31,846	$	26,285
Investments in marketable securities, current	95,948		99,718
Accounts receivable	1,608		1,776
Prepaid expenses and other current assets	3,375		4,248
Total current assets	132,777		132,027
Property and equipment, net of accumulated depreciation of $12,663 (December 31, 2023: $11,900)	3,556		4,674
Investments in marketable securities, non-current	2,964		6,284
Right of use asset	1,144		1,416

Total assets	$	140,441	$	144,401
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable and accrued liabilities	$	7,544	$	10,271
Deferred license revenue, current	10,911		11,791
Lease liability, current	468		425
Total current liabilities	18,923		22,487
Liability related to sale of future royalties	5,315		6,953

Contingent consideration	8,335		7,600
Lease liability, non-current	978		1,343
Total liabilities	33,551		38,383
Stockholders’ equity
Common shares
Authorized: unlimited number without par value
Issued and outstanding: 189,438,135 (December 31, 2023: 169,867,414)	1,407,595		1,349,821
Additional paid-in capital	81,425		81,270
Deficit	(1,334,040)		(1,276,652)
Accumulated other comprehensive loss	(48,090)		(48,421)
Total stockholders’ equity	106,890		106,018
Total liabilities and stockholders’ equity	$	140,441	$	144,401

See accompanying notes to the condensed consolidated financial statements.

ARBUTUS BIOPHARMA CORPORATION

Condensed Consolidated Statements of Operations and Comprehensive Loss

(Unaudited)

(In thousands of U.S. Dollars, except share and per share amounts)


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Revenue
Collaborations and licenses	$	767	$	3,935	$	2,861	$	13,329
Non-cash royalty revenue	572		723		1,736		2,667
Total Revenue	1,339		4,658		4,597		15,996
Operating expenses
Research and development	14,273		20,169		45,227		56,136
General and administrative	4,537		5,842		17,396		17,374
Change in fair value of contingent consideration	344		205		735		(158)
Restructuring	3,625		—		3,625		—
Total operating expenses	22,779		26,216		66,983		73,352
Loss from operations	(21,440)		(21,558)		(62,386)		(57,356)
Other income
Interest income	1,747		1,494		5,121		4,223
Interest expense	(29)		(46)		(107)		(415)
Foreign exchange gain/(loss)	5		6		(16)		11

Total other income	1,723		1,454		4,998		3,819


Net loss	$	(19,717)	$	(20,104)	$	(57,388)	$	(53,537)
Loss per share
Basic and diluted	$	(0.10)	$	(0.12)	$	(0.31)	$	(0.32)
Weighted average number of common shares
Basic and diluted	188,997,194		167,512,708		184,244,819		165,085,243

Comprehensive loss
Unrealized gain on available-for-sale securities	$	218	$	584	$	331	$	1,604
Comprehensive loss	$	(19,499)	$	(19,520)	$	(57,057)	$	(51,933)

See accompanying notes to the condensed consolidated financial statements.

ARBUTUS BIOPHARMA CORPORATION

Condensed Consolidated Statements of Stockholders’ Equity

(Unaudited)

(In thousands of U.S. Dollars, except share amounts)


	Common Shares
	Number of Shares	Share Capital		Additional Paid-In Capital		Deficit		Accumulated Other Comprehensive Loss		Total Stockholders' Equity
Balance December 31, 2023	169,867,414	$	1,349,821	$	81,270	$	(1,276,652)	$	(48,421)	$	106,018
Stock-based compensation expense	—	—		2,014		—		—		2,014
Issuance of common shares pursuant to the Open Market Sale Agreement	8,666,077	21,765		—		—		—		21,765
Issuance of common shares pursuant to exercise of options	1,126,691	4,268		(1,814)		—		—		2,454
Issuance of common shares pursuant to ESPP	121,563	271		(60)		—		—		211
Issuance of common shares upon vesting of RSUs	410,482	1,190		(1,190)		—		—		—
Unrealized gain on available-for-sale securities	—	—		—		—		50		50
Net loss	—	—		—		(17,875)		—		(17,875)
Balance March 31, 2024	180,192,227	$	1,377,315	$	80,220	$	(1,294,527)	$	(48,371)	$	114,637
Stock-based compensation expense	—	—		3,180		—		—		3,180
Issuance of common shares pursuant to the Open Market Sale Agreement	7,833,922	22,359		—		—		—		22,359
Issuance of common shares pursuant to exercise of options	712,895	3,660		(1,649)		—		—		2,011
Unrealized gain on available-for-sale securities	—	—		—		—		63		63
Net loss	—	—		—		(19,796)		—		(19,796)
Balance June 30, 2024	188,739,044	$	1,403,334	$	81,751	$	(1,314,323)	$	(48,308)	$	122,454
Stock-based compensation expense	—	—		2,160		—		—		2,160
Issuance of common shares pursuant to exercise of options	593,321	3,996		(2,406)		—		—		1,590
Issuance of common shares pursuant to ESPP	105,770	265		(80)		—		—		185
Unrealized gain on available-for-sale securities	—	—		—		—		218		218
Net loss	—	—		—		(19,717)		—		(19,717)
Balance September 30, 2024	189,438,135	$	1,407,595	$	81,425	$	(1,334,040)	$	(48,090)	$	106,890

See accompanying notes to the condensed consolidated financial statements.

ARBUTUS BIOPHARMA CORPORATION

Condensed Consolidated Statements of Stockholders’ Equity

(Unaudited)

(In thousands of U.S. Dollars, except share amounts)


	Common Shares
	Number of Shares	Share Capital		Additional Paid-In Capital		Deficit		Accumulated Other Comprehensive Loss		Total Stockholders' Equity
Balance December 31, 2022	157,455,363	$	1,318,737	$	72,406	$	(1,203,803)	$	(50,488)	$	136,852
Stock-based compensation expense	—	—		2,131		—		—		2,131
Issuance of common shares pursuant to the Open Market Sale Agreement	7,423,622	19,862		—		—		—		19,862
Issuance of common shares pursuant to exercise of options	101,356	457		(198)		—		—		259
Issuance of common shares pursuant to ESPP	151,852	397		(101)		—		—		296
Unrealized gain on available-for-sale securities	—	—		—		—		854		854
Net loss	—	—		—		(16,339)		—		(16,339)
Balance March 31, 2023	165,132,193	$	1,339,453	$	74,238	$	(1,220,142)	$	(49,634)	$	143,915
Stock-based compensation expense	—	—		2,964		—		—		2,964
Issuance of common shares pursuant to the Open Market Sale Agreement	1,790,546	4,742		—		—		—		4,742

Unrealized loss on available-for-sale securities	—	—		—		—		166		166
Net loss	—	—		—		(17,094)		—		(17,094)
Balance June 30, 2023	166,922,739	$	1,344,195	$	77,202	$	(1,237,236)	$	(49,468)	$	134,693
Stock-based compensation expense	—	—		2,483		—		—		2,483
Issuance of common shares pursuant to the Open Market Sale Agreement	633,922	1,396		—		—		—		1,396

Issuance of common shares pursuant to ESPP	138,586	424		(139)		—		—		285
Unrealized loss on available-for-sale securities	—	—		—		—		584		584
Net loss	—	—		—		(20,104)		—		(20,104)
Balance September 30, 2023	167,695,247	$	1,346,015	$	79,546	$	(1,257,340)	$	(48,884)	$	119,337

See accompanying notes to the condensed consolidated financial statements.

ARBUTUS BIOPHARMA CORPORATION

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(In thousands of U.S. Dollars)


	Nine Months Ended September 30,
	2024		2023
OPERATING ACTIVITIES
Net loss	$	(57,388)	$	(53,537)
Non-cash items:
Depreciation	1,047		1,045
Loss on impairment of lab equipment	167		—
Gain on sale of property and equipment	—		(20)
Stock-based compensation expense	7,354		7,578
Change in fair value of contingent consideration	735		(158)
Non-cash royalty revenue	(1,736)		(2,667)
Non-cash interest expense	98		412
Net accretion and amortization of investments in marketable securities	(2,212)		(1,577)
Net change in operating items:
Accounts receivable	168		(819)
Prepaid expenses and other assets	1,145		(2,040)
Accounts payable and accrued liabilities	(2,727)		(6,223)
Change in deferred license revenue	(880)		(10,349)
Other liabilities	(306)		(289)
Net cash used in operating activities	(54,535)		(68,644)
INVESTING ACTIVITIES
Purchase of investments in marketable securities	(98,318)		(56,490)
Proceeds from sale of property and equipment	—		20
Disposition of investments in marketable securities	107,951		86,026
Acquisition of property and equipment	(96)		(1,008)
Net cash provided by investing activities	9,537		28,548
FINANCING ACTIVITIES
Issuance of common shares pursuant to the Open Market Sale Agreement	44,124		26,000
Issuance of common shares pursuant to exercise of stock options	6,055		259
Issuance of common shares pursuant to ESPP	396		581
Net cash provided by financing activities	50,575		26,840
Effect of foreign exchange rate changes on cash and cash equivalents	(16)		11
Increase/(decrease) in cash and cash equivalents	5,561		(13,245)
Cash and cash equivalents, beginning of period	26,285		30,776
Cash and cash equivalents, end of period	$	31,846	$	17,531

See accompanying notes to the condensed consolidated financial statements.

ARBUTUS BIOPHARMA CORPORATION

Notes to Condensed Consolidated Financial Statements

(Tabular amounts in thousands of U.S. Dollars, except share and per share amounts)

1. Nature of business and future operations

Description of the Business

Arbutus Biopharma Corporation (“Arbutus” or “the Company”) is a clinical-stage biopharmaceutical company leveraging its extensive virology expertise to develop novel therapeutics with distinct mechanisms of action, which can potentially be combined to provide a functional cure for patients with chronic hepatitis B virus (cHBV) infection. The Company believes the key to success in developing a functional cure involves suppressing hepatitis B virus deoxyribonucleic acid, reducing hepatitis B surface antigen and boosting HBV-specific immune responses. The Company’s pipeline of internally developed, proprietary compounds includes an RNAi therapeutic, imdusiran (AB-729), and an oral PD-L1 inhibitor, AB-101. Imdusiran has generated meaningful clinical data demonstrating an impact on both surface antigen reduction and reawakening of the HBV-specific immune response. Imdusiran is currently in two Phase 2a combination clinical trials. AB-101 is currently being evaluated in a Phase 1a/1b clinical trial.

The Company continues to protect and defend its intellectual property, which is the subject of the Company’s ongoing lawsuits against Moderna Therapeutics, Inc. (Moderna) and Pfizer Inc. and BioNTech SE (collectively, Pfizer/BioNTech) for their use of the Company’s patented lipid nanoparticle (LNP) technology in their COVID-19 vaccines. With respect to the Moderna lawsuit, the claim construction hearing occurred on February 8, 2024. On April 3, 2024, the court provided its claim construction ruling in which it construed the disputed claim terms and agreed with the Company’s position on most of the disputed claim terms. On August 5, 2024, the Company and Genevant Sciences Ltd. (Genevant), along with Moderna, filed a Stipulation to Extend Time with the court that requested an amended case schedule to accommodate certain outstanding discovery from Moderna and third parties. The court approved the amended case schedule and the start of the trial was moved from April 21, 2025 to September 24, 2025, subject to the court’s availability. The lawsuit against Pfizer/BioNTech is ongoing and a date for a claim construction hearing has been scheduled for December 18, 2024.

Liquidity

At September 30, 2024, the Company had an aggregate of $130.8 million in cash, cash equivalents and investments in marketable securities. The Company had no outstanding debt as of September 30, 2024. The Company believes it has sufficient cash resources to fund its operations for at least the next 12 months.

The success of the Company is dependent on obtaining the necessary regulatory approvals to bring its products to market and achieve profitable operations. The Company’s research and development activities and the commercialization of its products are dependent on its ability to successfully complete these activities and to obtain adequate financing through a combination of financing activities and operations. It is not possible to predict either the outcome of the Company’s existing or future research and development programs or the Company’s ability to continue to fund these programs in the future.

2. Significant accounting policies

Basis of presentation and principles of consolidation

These unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles for interim financial statements and accordingly, do not include all disclosures required for annual financial statements. These statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. These unaudited condensed consolidated financial statements include the accounts of Arbutus Biopharma Corporation and its one wholly-owned subsidiary, Arbutus Biopharma, Inc., and reflect, in the opinion of management, all adjustments and reclassifications necessary to fairly present the Company’s financial position as of September 30, 2024 and December 31, 2023, the Company’s results of operations for the three and nine months ended September 30, 2024 and 2023, and the Company’s cash flows for the nine months ended September 30, 2024 and 2023. Such adjustments are of a normal recurring nature. The results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results for the full year. These unaudited condensed consolidated financial statements follow the same significant accounting policies as those described in the notes to the audited consolidated financial statements of the Company for the year ended December 31, 2023, except as described below under the section entitled “Recent Accounting Pronouncements.”

All intercompany balances and transactions have been eliminated.

Net loss per share

Net loss per share is calculated based on the weighted average number of common shares outstanding. Diluted net loss per share does not differ from basic net loss per share for the three and nine months ended September 30, 2024 and 2023, since the effect of including potential common shares would be anti-dilutive. For the nine months ended September 30, 2024, potential common shares of 18.7 million pertaining to outstanding stock options and unvested restricted stock units were excluded from the calculation of net loss per share. A total of approximately 21.0 million outstanding stock options were excluded from the calculation for the nine months ended September 30, 2023.

Revenue from collaborations and licenses

The Company generates revenue through certain collaboration agreements and license agreements. Such agreements may require the Company to deliver various rights and/or services, including intellectual property rights or licenses and research and development services. Under such agreements, the Company is generally eligible to receive non-refundable upfront payments, funding for research and development services, milestone payments and royalties.

The Company’s collaboration agreements fall under the scope of Accounting Standards Codification (ASC) Topic 808, Collaborative Arrangements (ASC 808), when both parties are active participants in the arrangement and are exposed to significant risks and rewards. For certain arrangements under the scope of ASC 808, the Company analogizes to ASC Topic 606, Revenue from Contracts with Customers (ASC 606), for some aspects, including for the delivery of a good or service (i.e., a unit of account).

ASC 606 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers under a five-step model: (i) identify contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when or as a performance obligation is satisfied.

In contracts where the Company has more than one performance obligation to provide its customer with goods or services, each performance obligation is evaluated to determine whether it is distinct based on whether (i) the customer can benefit from the good or service either on its own or together with other resources that are readily available and (ii) the good or service is separately identifiable from other promises in the contract. The consideration under the contract is then allocated between the distinct performance obligations based on their respective relative stand-alone selling prices. The estimated stand-alone selling price of each deliverable reflects the Company’s best estimate of what the selling price would be if the deliverable was regularly sold on a stand-alone basis and is determined by reference to market rates for the good or service when sold to others or by using an adjusted market assessment approach if the selling price on a stand-alone basis is not available.

The consideration allocated to each distinct performance obligation is recognized as revenue when control is transferred to the customer for the related goods or services. Consideration associated with at-risk substantive performance milestones, including sales-based milestones, is recognized as revenue when it is probable that a significant reversal of the cumulative revenue recognized will not occur. Sales-based royalties received in connection with licenses of intellectual property are subject to a specific exception in the revenue standards, whereby the consideration is not included in the transaction price and recognized in revenue until the customer’s subsequent sales or usages occur.

Deferred Revenue

When consideration is received or is unconditionally due from a customer, collaborator or licensee prior to the Company completing its performance obligation to the customer, collaborator or licensee under the terms of a contract, deferred revenue is recorded. Deferred revenue expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a current liability. Deferred revenue not expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a long-term liability. In accordance with ASC Topic 210-20, Balance Sheet - Offsetting (ASC 210-20) the Company’s deferred revenue is offset by a contract asset as further discussed in Note 9.

Segment information

The Company operates as a single segment.

Recent accounting pronouncements

In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07), which requires disclosure of significant segment expenses and other segment items on an annual and interim basis under ASC 280. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. Early adoption is permitted and the amendments in this ASU should be applied on a retrospective basis to all periods presented. The Company has not yet determined the impact ASU 2023-07 may have on the Company’s financial statement disclosures.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU 2023-09), which improves income tax disclosures by requiring: (1) consistent categories and greater disaggregation of information in the rate reconciliation, and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The ASU indicates that all entities will apply the guidance prospectively with an option for retroactive application to each period presented in the financial statements. The Company has not yet determined the impact ASU 2023-09 may have on the Company’s financial statement disclosures.

The Company has reviewed all other recently issued standards and has determined that such standards will not have a material impact on the Company’s financial statements or do not otherwise apply to the Company’s operations.

3. Fair value measurements

The Company measures certain financial instruments and other items at fair value.

To determine the fair value, the Company uses the fair value hierarchy for inputs used in measuring fair value that maximize the use of observable inputs and minimize the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use to value an asset or liability and are developed based on market data obtained from independent sources. Unobservable inputs are inputs based on assumptions about the factors market participants would use to value an asset or liability. The three levels of inputs that may be used to measure fair value are as follows:

•Level 1 inputs are quoted market prices for identical instruments available in active markets.

•Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability either directly or indirectly. If the asset or liability has a contractual term, the input must be observable for substantially the full term. An example includes quoted market prices for similar assets or liabilities in active markets.

•Level 3 inputs are unobservable inputs for the asset or liability and will reflect management’s assumptions about market assumptions that would be used to price the asset or liability.

Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy.

The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the immediate or short-term maturity of these financial instruments.

To determine the fair value of the contingent consideration (Note 8), the Company uses a probability weighted assessment of the likelihood the milestones would be met and the estimated timing of such payments, and then the potential contingent payments are discounted to their present value using a probability adjusted discount rate that reflects the early stage nature of the development program, the time to complete the program development, and overall biotech indices. The Company determined the fair value of the contingent consideration was $8.3 million as of September 30, 2024 and the increase of $0.7 million from December 31, 2023 has been recorded as a component of total operating expenses in the statements of operations and comprehensive loss for the nine months ended September 30, 2024. The assumptions used in the discounted cash flow model are level 3 inputs as defined above. The Company assessed the sensitivity of the fair value measurement to changes in these unobservable inputs, and determined that changes within a reasonable range would not result in a materially different assessment of fair value.

The following tables present information about the Company’s assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques used to determine such fair value:


	Level 1		Level 2		Level 3		Total
As of September 30, 2024	(in thousands)
Assets
Cash and cash equivalents	$	31,846	$	—	$	—	$	31,846
Investments in marketable securities, current	—		95,948		—		95,948
Investments in marketable securities, non-current	—		2,964		—		2,964
Total	$	31,846	$	98,912	$	—	$	130,758
Liabilities
Contingent consideration	—		—		8,335		8,335
Total	$	—	$	—	$	8,335	$	8,335


	Level 1		Level 2		Level 3		Total
As of December 31, 2023	(in thousands)
Assets
Cash and cash equivalents	$	26,285	$	—	$	—	$	26,285
Investments in marketable securities, current	—		99,718		—		99,718
Investments in marketable securities, non-current	—		6,284		—		6,284
Total	$	26,285	$	106,002	$	—	$	132,287
Liabilities
Contingent consideration	—		—		7,600		7,600
Total	$	—	$	—	$	7,600	$	7,600

The following table presents the changes in fair value of the Company’s contingent consideration:


	Liability at beginning of the period		Change in fair value of liability		Liability at end of the period
	(in thousands)
Nine Months Ended September 30, 2024	$	7,600	$	735	$	8,335
Nine Months Ended September 30, 2023	$	7,531	$	(158)	$	7,373

See Note 4 for additional information regarding the fair value of the Company’s investments in marketable securities.

4. Investments in marketable securities

Investments in marketable securities consisted of the following:


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of September 30, 2024	(in thousands)
Cash equivalents
Money market	$	25,948	$	—	$	—	$	25,948

Total	$	25,948	$	—	$	—	$	25,948
Investments in marketable short-term securities

US corporate bonds	43,477		23		(9)		43,491
US treasury bills	52,408		49		—		52,457


Total	$	95,885	$	72	$	(9)	$	95,948
Investments in marketable long-term securities

US corporate bonds	2,932		32		—		2,964


Total	$	2,932	$	32	$	—	$	2,964

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of December 31, 2023	(in thousands)
Cash equivalents
Money market fund	$	18,029	$	—	$	—	$	18,029
Total	$	18,029	$	—	$	—	$	18,029
Investments in marketable short-term securities
US government agency bonds	$	17,918	$	—	$	(44)	$	17,874
US corporate bonds	71,045		30		(189)		70,886
Yankee bonds	2,000		—		(17)		1,983
US government bonds	$	9,001	$	—	$	(26)	$	8,975
Total	$	99,964	$	30	$	(276)	$	99,718
Investments in marketable long-term securities

US corporate bonds	6,273		18		(7)		6,284


Total	$	6,273	$	18	$	(7)	$	6,284

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.

The contractual term to maturity of the $95.9 million of short-term marketable securities held by the Company as of September 30, 2024 is less than one year. As of September 30, 2024, the Company held $3.0 million of long-term marketable securities with contractual maturities of more than one year, but less than five years. As of December 31, 2023, the Company’s

$99.7 million of short-term marketable securities had contractual maturities of less than one year, while the Company’s $6.3 million of long-term marketable securities had maturities of more than one year, but less than five years.

At September 30, 2024 and December 31, 2023, the Company had 7 and 27, respectively, available-for-sale investment debt securities in an unrealized loss position without an allowance for credit losses. Unrealized losses on the Company’s investments in debt securities have not been recognized into income as the issuers’ bonds are of high credit quality and the decline in fair value is largely due to market conditions and/or changes in interest rates. The Company does not intend to sell and it is more likely than not that the Company will not be required to sell the securities prior to the anticipated recovery of their amortized cost basis. The issuers continue to make timely interest payments on the bonds. The fair value is expected to recover as the bonds approach maturity.

Accrued interest receivable on investments in marketable securities of $0.3 million at both September 30, 2024 and December 31, 2023 is included in prepaid expenses and other current assets.

The Company had realized gains of less than $0.1 million for the three and nine months ended September 30, 2024 and zero and less than $0.1 million realized gains for same periods in 2023, respectively.

See Note 3 for additional information regarding the fair value of the Company’s investments in marketable securities.

5. Investment in Genevant

In April 2018, the Company entered into an agreement with Roivant Sciences Ltd. (Roivant), its largest shareholder, to launch Genevant, a company focused on a broad range of RNA-based therapeutics enabled by the Company’s LNP and ligand conjugate delivery technologies. The Company licensed rights to its LNP and ligand conjugate delivery platforms to Genevant for RNA-based applications outside of HBV, except to the extent certain rights had already been licensed to other third parties (the Genevant License). The Company retained all rights to its LNP and conjugate delivery platforms for HBV.

Under the Genevant License, as amended, if a third party sublicensee of intellectual property licensed by Genevant from the Company commercializes a sublicensed product, the Company becomes entitled to receive a specified percentage of certain revenue that may be received by Genevant for such sublicense, including royalties, commercial milestones and other sales-related revenue, or, if less, tiered low single-digit royalties on net sales of the sublicensed product. The specified percentage is 20% in the case of a mere sublicense (i.e., naked sublicense) by Genevant without additional contribution and 14% in the case of a bona fide collaboration with Genevant.

Additionally, if Genevant receives proceeds from an action for infringement by any third parties of the Company’s intellectual property licensed to Genevant, the Company would be entitled to receive, after deduction of litigation costs, 20% of the proceeds received by Genevant or, if less, tiered low single-digit royalties on net sales of the infringing product (inclusive of the proceeds from litigation or settlement, which would be treated as net sales).

The Company accounts for its interest in Genevant as equity securities without readily determinable fair values. Accordingly, an estimate of the fair value of the securities is based on the original cost less previously recognized equity method losses, less impairments, plus or minus changes resulting from observable price changes in orderly transactions for identical or a similar Genevant securities. As of September 30, 2024, the carrying value of the Company’s investment in Genevant was zero and the Company owned approximately 16% of the common equity of Genevant.

6. Accounts payable and accrued liabilities

Accounts payable and accrued liabilities are comprised of the following:


	September 30, 2024		December 31, 2023
	(in thousands)
Trade accounts payable	$	2,315	$	3,223
Research and development accruals	1,367		2,884
Professional fee accruals	709		815
Payroll accruals	2,588		3,349
Restructuring liabilities	565		—
Total accounts payable and accrued liabilities	$	7,544	$	10,271

7. Sale of future royalties

On July 2, 2019, the Company entered into a Purchase and Sale Agreement (the Agreement) with the Ontario Municipal Employees Retirement System (OMERS), pursuant to which the Company sold to OMERS part of its royalty interest on future global net sales of ONPATTRO® (Patisiran) (ONPATTRO), an RNA interference therapeutic currently being sold by Alnylam Pharmaceuticals, Inc. (Alnylam).

ONPATTRO utilizes the Company’s LNP technology, which was licensed to Alnylam pursuant to the Cross-License Agreement, dated November 12, 2012, by and between the Company and Alnylam (the LNP License Agreement). Under the terms of the LNP License Agreement, the Company is entitled to tiered royalty payments on global net sales of ONPATTRO ranging from 1.00% to 2.33% after offsets, with the highest tier applicable to annual net sales above $500 million. This royalty interest was sold to OMERS, effective as of January 1, 2019, for $20 million in gross proceeds before advisory fees. OMERS will retain this entitlement until it has received $30 million in royalties, at which point 100% of such royalty interest on future global net sales of ONPATTRO will revert to the Company. OMERS has assumed the risk of collecting up to $30 million of future royalty payments from Alnylam and the Company is not obligated to reimburse OMERS if they fail to collect any such future royalties.

The $30 million in royalties to be paid to OMERS is accounted for as a liability, with the difference between the liability and the gross proceeds received accounted for as a discount. The discount, as well as $1.5 million of transaction costs, will be amortized as interest expense based on the projected balance of the liability as of the beginning of each period. As of September 30, 2024, the Company estimated an effective annual interest rate of approximately 2.0%. Over the course of the Agreement, the actual interest rate will be affected by the amount and timing of royalty revenue recognized and changes in the timing of forecasted royalty revenue. On a quarterly basis, the Company will reassess the expected timing of the royalty revenue, recalculate the amortization and effective interest rate and adjust the accounting prospectively as needed.

The Company recognizes non-cash royalty revenue related to the sales of ONPATTRO during the term of the Agreement. As royalties are remitted to OMERS from Alnylam, the balance of the recognized liability is effectively repaid over the life of the Agreement. From the inception of the royalty sale through September 30, 2024, the Company has recorded an aggregate of $24.4 million of non-cash royalty revenue for royalties earned by OMERS. There are a number of factors that could materially affect the amount and timing of royalty payments from Alnylam, none of which are within the Company’s control.

During the nine months ended September 30, 2024, the Company recognized non-cash royalty revenue of $1.7 million and related non-cash interest expense of less than $0.1 million. During the nine months ended September 30, 2023, the Company recognized non-cash royalty revenue of $2.7 million and related non-cash interest expense of $0.4 million.

The table below shows the activity related to the net liability for the nine months ended September 30, 2024 and 2023:


	Nine Months Ended September 30,
	2024		2023
	(in thousands)
Net liability related to sale of future royalties - beginning balance	$	6,953	$	10,365
Non-cash royalty revenue	(1,736)		(2,667)
Non-cash interest expense	98		412
Net liability related to sale of future royalties - ending balance	$	5,315	$	8,110

In addition to the royalty from the LNP License Agreement, the Company is also receiving a second royalty interest ranging from 0.75% to 1.125% on global net sales of ONPATTRO, with 0.75% applying to sales greater than $500 million, originating from a settlement agreement and subsequent license agreement with Acuitas Therapeutics, Inc. (Acuitas). The royalty from Acuitas has been retained by the Company and was not part of the royalty sale to OMERS.

8. Contingencies and commitments

Stock Purchase Agreement with Enantigen

In October 2014, Arbutus Inc., the Company’s wholly-owned subsidiary, acquired all of the outstanding shares of Enantigen Therapeutics, Inc. (Enantigen) pursuant to a stock purchase agreement. The amount paid to Enantigen’s selling shareholders could be up to an additional $102.5 million in sales performance milestones in connection with the sale of the first commercialized product by the Company for the treatment of HBV, regardless of whether such product is based upon assets acquired under this agreement, and a low single-digit royalty on net sales of such first commercialized HBV product, up to a maximum royalty payment of $1.0 million that, if paid, would be offset against the Company’s milestone payment obligations. Certain other development milestones related to the acquisition were tied to programs which are no longer under development by the Company, and therefore the contingency related to those development milestones is zero.

The contingent consideration is a financial liability and is measured at its fair value at each reporting period, with any changes in fair value from the previous reporting period recorded in the statements of operations and comprehensive loss (see Note 3).

The fair value of the contingent consideration was $8.3 million as of September 30, 2024.

9. Collaborations, contracts and licensing agreements

Collaborations

Qilu Pharmaceutical Co., Ltd.

In December 2021, the Company entered into a technology transfer and licensing agreement (the License Agreement) with Qilu Pharmaceutical Co., Ltd. (Qilu), pursuant to which the Company granted Qilu a sublicensable, royalty-bearing license, under certain intellectual property owned by the Company, which is non-exclusive as to development and manufacturing and exclusive with respect to commercialization of imdusiran, including pharmaceutical products that include imdusiran, for the treatment or prevention of hepatitis B in China, Hong Kong, Macau and Taiwan (the Territory).

In partial consideration for the rights granted by the Company, Qilu paid the Company a one-time upfront cash payment of $40.0 million, net of withholding taxes, on January 5, 2022, and agreed to pay the Company milestone payments totaling up to $245.0 million, net of withholding taxes, upon the achievement of certain technology transfer, development, regulatory and commercialization milestones. Qilu paid $4.4 million of withholding taxes to the Chinese taxing authority on the Company’s behalf, related to the upfront cash payment. In addition, Qilu agreed to pay the Company double-digit royalties into the low twenties percent based upon annual net sales of imdusiran in the Territory. The royalties are payable on a product-by-product and region-by-region basis, subject to certain limitations.

committee has been established between the Company and Qilu to coordinate and review the development, manufacturing and commercialization plans. Both parties also have entered into a supply agreement and related quality agreement pursuant to which the Company will manufacture or have manufactured and supply Qilu with all quantities of imdusiran necessary for Qilu to develop and commercialize in the Territory until the Company has completed manufacturing technology transfer to Qilu and Qilu has received all approvals required for it or its designated contract manufacturing organization to manufacture imdusiran in the Territory.

Concurrent with the execution of the License Agreement, the Company entered into a Share Purchase Agreement (the Share Purchase Agreement) with Anchor Life Limited, a company established pursuant to the applicable laws and regulations of Hong Kong and an affiliate of Qilu (the Investor), pursuant to which the Investor purchased 3,579,952 of the Company’s common shares at a purchase price of USD $4.19 per share, which was a 15% premium on the thirty-day average closing price of the common shares as of the close of trading on December 10, 2021 (the Share Transaction). The Company received $15.0 million of gross proceeds from the Share Transaction on January 6, 2022. The common shares sold to the Investor in the Share Transaction represented approximately 2.5% of the common shares outstanding immediately prior to the execution of the Share Purchase Agreement.

The License Agreement falls under the scope of ASC 808 as both parties are active participants in the arrangement and are exposed to significant risks and rewards. While this arrangement is in the scope of ASC 808, the Company analogizes to ASC 606 for some aspects of this arrangement, including for the delivery of a good or service (i.e., a unit of account). In accordance with the guidance, the Company identified the following commitments under the arrangement: (i) rights to develop, use, sell, have sold, offer for sale and import any product comprised of Licensed Product (as defined in the License Agreement) (the Qilu License) and (ii) drug supply obligations and manufacturing technology transfer (the Manufacturing Obligations). The Company determined that these two commitments are not distinct performance obligations for purposes of recognizing revenue as the manufacturing process is highly specialized and Qilu would not be able to benefit from the Qilu License without the Company’s involvement in the manufacturing activities until the transfer of the manufacturing know-how is complete. As such, the Company will combine these commitments into one performance obligation to which the transaction price will be allocated to and will recognize this transaction price associated with the bundled performance obligation over time using an inputs method based on labor hours expended by the Company on its Manufacturing Obligations.

The Company determined the initial transaction price of the combined performance obligation to be $50.4 million, which includes the $40.0 million upfront fee, $4.4 million of withholding taxes paid by Qilu on behalf of the Company, the premium paid for the Share Transaction of $4.1 million. The Company determined the milestone payments to be variable consideration subject to constraint at inception. At the end of each subsequent reporting period, the Company will reevaluate the probability of achievement of the future development, regulatory, and sales milestones subject to constraint and, if necessary, will adjust its estimate of the overall transaction price. Any such adjustments will be recorded on a cumulative catch-up basis, which would affect revenues and earnings in the period of adjustment.

The following table outlines the transaction price and the changes to the related liability balance:


	Transaction Price		Cumulative Collaboration Revenue Recognized		Deferred License Revenue
	(in thousands)
Combined performance obligation	$	50,445	$	37,561	$	12,884
Less contract asset					(1,973)
Total deferred license revenue					10,911

The Company recognized $0.1 million and $0.9 million of revenue based on labor hours expended by the Company on its Manufacturing Obligations during the three and nine months ended September 30, 2024, respectively, and $3.2 million and $10.3 million during the three and nine months ended September 30, 2023, respectively.

As of September 30, 2024, the balance of the deferred license revenue was $12.9 million, which, in accordance with ASC 210-20, was partially offset by the contract asset associated with the manufacturing cost reimbursement of $2.0 million, resulting in a net deferred license revenue liability of $10.9 million.

The Company incurred $0.6 million of incremental costs in obtaining the Qilu License, which the Company capitalized in other current assets and other assets and amortizes as a component of general and administrative expense commensurate with the recognition of the combined performance obligation. The Company recognized amortization expense of less than $0.1 million for both the three and nine months ended September 30, 2024 and amortization expense of less than $0.1 million for the three months ended September 30, 2023 and $0.1 million for the nine months ended September 30, 2023.

The Company reevaluates the transaction price and the total estimated labor hours expected to be incurred to satisfy the performance obligations and adjusts the deferred revenue at the end of each reporting period. Such changes will result in a change to the amount of collaboration revenue recognized and deferred revenue.

Barinthus Biotherapeutics plc

In July 2021, the Company entered into a clinical collaboration agreement with Barinthus Biotherapeutics plc (Barinthus), formerly Vaccitech plc, to evaluate imdusiran followed by Barinthus’ VTP-300, an HBV antigen specific immunotherapy, and ongoing nucleos(t)ide analogue therapy in patients with cHBV. This clinical trial was amended and is now dosing patients in an additional treatment arm that includes an approved PD-1 monoclonal antibody inhibitor, nivolumab (Opdivo®).

The Company is responsible for managing this Phase 2a proof-of-concept clinical trial, subject to oversight by a joint development committee comprised of representatives from the Company and Barinthus. The Company and Barinthus retain full rights to their respective product candidates and will split all costs associated with the clinical trial. The Company incurred $0.5 million and $1.7 million of expenses, net of Barinthus’s 50% share, during the three and nine months ended September 30, 2024, respectively, and $0.7 million and $1.6 million during the three and nine months ended September 30, 2023 respectively, and reflected those costs in research and development in the statements of operations and comprehensive loss.

Royalty Entitlements

Alnylam Pharmaceuticals, Inc. and Acuitas Therapeutics, Inc.

The Company has two royalty entitlements to Alnylam’s global net sales of ONPATTRO.

In 2012, the Company entered into the LNP License Agreement with Alnylam that entitles Alnylam to develop and commercialize products with the Company’s LNP technology. Alnylam launched ONPATTRO, the first approved application of the Company’s LNP technology, in 2018. Under the terms of this license agreement, the Company is entitled to tiered royalty payments on global net sales of ONPATTRO ranging from 1.00% - 2.33% after offsets, with the highest tier applicable to annual net sales above $500 million. This royalty interest was sold to OMERS, effective as of January 1, 2019, for $20 million in gross proceeds before advisory fees. OMERS will retain this entitlement until it has received $30 million in royalties, at which point 100% of this royalty entitlement on future global net sales of ONPATTRO will revert back to the Company. OMERS has assumed the risk of collecting up to $30 million of future royalty payments from Alnylam and the Company is not obligated to reimburse OMERS if they fail to collect any such future royalties. If this royalty entitlement reverts to the Company, it has the potential to provide an active royalty stream or to be otherwise monetized again in full or in part. From the inception of the royalty sale through September 30, 2024, an aggregate of $24.4 million of royalties have been earned by OMERS.

The Company also is receiving a second royalty interest of 0.75% to 1.125% on global net sales of ONPATTRO, with 0.75% applying to sales greater than $500 million, originating from a settlement agreement and subsequent license agreement with Acuitas. This royalty entitlement from Acuitas has been retained by the Company and was not part of the royalty entitlement sale to OMERS.

Revenues are summarized in the following table:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands)				(in thousands)
Revenue from collaborations and licenses
Acuitas Therapeutics, Inc.	$	644	$	714	$	1,981	$	2,980
Qilu Pharmaceutical Co., Ltd.	123		3,221		880		10,349

Non-cash royalty revenue
Alnylam Pharmaceuticals, Inc.	572		723		1,736		2,667
Total revenue	$	1,339	$	4,658	$	4,597	$	15,996

10. Shareholders’ equity

Authorized share capital

The Company’s authorized share capital consists of an unlimited number of common shares and preferred shares, without par value, and 1,164,000 Series A participating convertible preferred shares, without par value.

Open Market Sale Agreement

The Company has an Open Market Sale AgreementSM with Jefferies LLC (Jefferies) dated December 20, 2018, as amended by Amendment No. 1, dated December 20, 2019, Amendment No. 2, dated August 7, 2020 and Amendment No. 3, dated March 4, 2021 (as amended, the Sale Agreement), under which the Company may issue and sell common shares, from time to time.

On December 23, 2019, the Company filed a shelf registration statement on Form S-3 with the Securities and Exchange Commission (the SEC) (File No. 333-235674) and accompanying base prospectus, which was declared effective by the SEC on January 10, 2020 (the January 2020 Registration Statement), for the offer and sale of up to $150.0 million of the Company’s securities. The January 2020 Registration Statement also contained a prospectus supplement for an offering of up to $50.0 million of the Company’s common shares pursuant to the Sale Agreement. This prospectus supplement was fully utilized during 2020. On August 7, 2020, the Company filed a prospectus supplement with the SEC (the August 2020 Prospectus Supplement) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the January 2020 Registration Statement. The August 2020 Prospectus Supplement was fully utilized during 2020. The January 2020 Registration Statement expired in January 2023.

On August 28, 2020, the Company filed a shelf registration statement on Form S-3 with the SEC (File No. 333-248467) and accompanying base prospectus, which was declared effective by the SEC on October 22, 2020 (the October 2020 Registration Statement), for the offer and sale of up to $200.0 million of the Company’s securities. On March 4, 2021, the Company filed a prospectus supplement with the SEC (the March 2021 Prospectus Supplement) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the October 2020 Registration Statement. The March 2021 Prospectus Supplement was fully utilized during 2021. On October 8, 2021, the Company filed a prospectus supplement with the SEC (the October 2021 Prospectus Supplement) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the October 2020 Registration Statement. The October 2020 Registration Statement expired in October 2023 with $29.3 million that was not utilized under the October 2021 Prospectus Supplement.

On November 4, 2021, the Company filed a shelf registration statement on Form S-3 with the SEC (File No. 333-260782) and accompanying base prospectus, which was declared effective by the SEC on November 18, 2021 (the November 2021 Registration Statement), for the offer and sale of up to $250.0 million of the Company’s securities.

On March 3, 2022, the Company filed a prospectus supplement with the SEC (the March 2022 Prospectus Supplement) for an offering of up to an additional $100.0 million of its common shares pursuant to the Sale Agreement under: (i) the January 2020 Registration Statement; (ii) the October 2020 Registration Statement; and (iii) the November 2021 Registration Statement, of which only the November 2021 Registration Statement remains active.

During the three months ended September 30, 2024, the Company did not issue any common shares pursuant to the Sale Agreement. During the nine months ended September 30, 2024, the Company issued 16,499,999 common shares pursuant to the Sale Agreement, resulting in net proceeds of approximately $44.1 million. During the three and nine months ended September 30, 2023, the Company issued 633,922 and 9,848,090 common shares pursuant to the Sale Agreement, respectively, resulting in net proceeds of $1.4 million and $26.0 million, respectively.

As of September 30, 2024, there was approximately $25.4 million of common shares remaining available in aggregate under the March 2022 Prospectus Supplement, pursuant to the November 2021 Registration Statement.

Stock-based compensation

The table below summarizes information about the Company’s stock-based compensation for the three and nine months ended September 30, 2024 and 2023 and the expense recognized in the condensed consolidated statements of operations:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)
Stock options
Options granted during period	—		784,240		4,163,000		5,082,640
Weighted average exercise price	$	—	$	2.25	$	2.49	$	2.78
Restricted stock units (RSUs)
Restricted stock units granted during period	—		—		1,316,200		1,344,550
Grant date fair value	$	—	$	—	$	2.40	$	2.90
Stock compensation expense
Research and development	$	847	$	1,002	$	3,007	$	2,854
General and administrative	1,313		1,481		4,347		4,724
Total stock compensation expense	$	2,160	$	2,483	$	7,354	$	7,578

11. Restructuring

On July 29, 2024, the Company’s Board of Directors approved a plan, effective August 1, 2024, to streamline the organization to focus its efforts on advancing the clinical development of imdusiran and AB-101, and therefore ceased all discovery efforts and discontinued its IM-PROVE III clinical trial. In taking these steps to streamline the organization, the Company implemented a 40% reduction in its workforce, primarily affecting the discovery and general and administrative functions. As a result, the Company incurred a one-time restructuring charge in the third quarter of 2024 of $3.6 million, which includes approximately $2.9 million of cash severance and continued benefits paid, a non-cash impairment charge for laboratory equipment of $0.2 million and $0.5 million of cash payments to vendors for close-out activities in connection with the cessation of discovery efforts and the discontinuation of the IM-PROVE III clinical trial.

As of September 30, 2024, there were $0.6 million of accrued restructuring costs for contract close-out activities and severance payments included in accounts payable and accrued liabilities.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion and analysis by our management of our financial position and results of operations in conjunction with our audited consolidated financial statements and related notes thereto included as part of our Annual Report on Form 10-K for the year ended December 31, 2023 and our unaudited condensed consolidated financial statements for the three and nine months ended September 30, 2024. Our consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles and are presented in U.S. dollars.

REFERENCES TO ARBUTUS BIOPHARMA CORPORATION

Throughout this Quarterly Report on Form 10-Q (Form 10-Q), the “Company,” “Arbutus,” “we,” “us,” and “our,” except where the context requires otherwise, refer to Arbutus Biopharma Corporation and its consolidated subsidiary, and “our Board of Directors” refers to the board of directors of Arbutus Biopharma Corporation.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Form 10-Q contains “forward-looking statements” or “forward-looking information” within the meaning of applicable United States and Canadian securities laws (we collectively refer to these items as “forward-looking statements”). Forward-looking statements are generally identifiable by use of the words “believes,” “may,” “plans,” “will,” “anticipates,” “intends,” “budgets,” “could,” “estimates,” “expects,” “forecasts,” “projects” and similar expressions that are not based on historical fact or that are predictions of or indicate future events and trends, and the negative of such expressions. Forward-looking statements in this Form 10-Q, including the documents incorporated by reference, include statements about, among other things:

•our strategy, future operations, preclinical studies, clinical trials, prospects and the plans of management;

•the potential for our product candidates to achieve their desired or anticipated outcomes;

•the expected cost, timing and results of our clinical development plans and clinical trials, including our clinical collaborations with third parties;

•the development and commercialization of a curative combination regimen for chronic hepatitis B infection, a disease of the liver caused by the hepatitis B virus;

•the potential of our product candidates to improve upon the standard of care and contribute to a functional curative combination treatment regimen;

•obtaining necessary regulatory approvals;

•obtaining adequate financing through a combination of financing activities and operations;

•the expected returns and benefits from strategic alliances, licensing agreements, and research collaborations with third parties, and the timing thereof;

•our expectations regarding our technology licensed to third parties, and the timing thereof;

•our anticipated revenue and expense fluctuation and guidance;

•our expectations regarding the timing of announcing data from our ongoing clinical trials;

•our expectations regarding current patent disputes and litigation;

•our expectation of a net cash burn between $63 million and $67 million in 2024; and

•our belief that we have sufficient cash resources to fund our operations into the fourth quarter of 2026,

as well as other statements relating to our future operations, financial performance or financial condition, prospects or other future events. Forward-looking statements appear primarily in the sections of this Form 10-Q entitled “Part I, Item 1-Financial Statements (Unaudited),” and “Part I, Item 2-Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Forward-looking statements are based upon current expectations and assumptions and are subject to a number of known and unknown risks, uncertainties and other factors that could cause actual results to differ materially and adversely from those expressed or implied by such statements. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in this Form 10-Q and our Annual Report on Form 10-K for the year ended December 31, 2023 (the Form 10-K), and in particular the risks and uncertainties discussed under “Item 1A-Risk Factors” of this Form 10-Q and the Form 10-K. As a result, you should not place undue reliance on forward-looking statements.

Additionally, the forward-looking statements contained in this Form 10-Q represent our views only as of the date of this Form 10-Q (or any earlier date indicated in such statement). While we may update certain forward-looking statements from time to time, we specifically disclaim any obligation to do so, even if new information becomes available in the future. However, you are advised to consult any further disclosures we make on related subjects in the periodic and current reports that we file with the Securities and Exchange Commission (the SEC).

The foregoing cautionary statements are intended to qualify all forward-looking statements wherever they may appear in this Form 10-Q. For all forward-looking statements, we claim protection of the safe harbor contained in the Private Securities Litigation Reform Act of 1995.

This Form 10-Q also contains estimates, projections and other information concerning our industry, our business, the markets for certain diseases, including data regarding the estimated size of those markets, and the incidence and prevalence of certain medical conditions. Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties and actual events or circumstances may differ materially from events and circumstances reflected in this information. Unless otherwise expressly stated, we obtained this industry, business, market and other data from reports, research surveys, studies and similar data prepared by market research firms and other third parties, industry, medical and general publications, government data and similar sources.

OVERVIEW

Arbutus Biopharma Corporation (“Arbutus”, the “Company”, “we”, “us”, and “our”) is a clinical-stage biopharmaceutical company leveraging its extensive virology expertise to develop novel therapeutics with distinct mechanisms of action, which can potentially be combined to provide a functional cure for patients with chronic hepatitis B virus (cHBV) infection. We believe the key to success in developing a functional cure involves suppressing hepatitis B virus deoxyribonucleic acid (HBV DNA), reducing hepatitis B surface antigen (HBsAg) and boosting HBV-specific immune responses. Our pipeline of internally developed, proprietary compounds includes an RNAi therapeutic, imdusiran (AB-729), and an oral PD-L1 inhibitor, AB-101. Imdusiran has generated meaningful clinical data demonstrating an impact on both surface antigen reduction and reawakening of the HBV-specific immune response. Imdusiran is currently in two Phase 2a combination clinical trials. AB-101 is currently being evaluated in a Phase 1a/1b clinical trial. 

We continue to protect and defend our intellectual property, which is the subject of our ongoing lawsuits against Moderna Therapeutics, Inc. (Moderna) and Pfizer Inc. and BioNTech SE (collectively, Pfizer/BioNTech) for their use of our patented lipid nanoparticle (LNP) technology in their COVID-19 vaccines. With respect to the Moderna lawsuit, the claim construction hearing occurred on February 8, 2024. On April 3, 2024, the court provided its claim construction ruling in which it construed the disputed claim terms and agreed with our position on most of the disputed claim terms. On August 5, 2024, we and Genevant Sciences Ltd. (Genevant), along with Moderna, filed a Stipulation to Extend Time (the Stipulation) with the court that requested an amended case schedule to accommodate certain outstanding discovery from Moderna and third parties. The court approved the amended case schedule and the start of the trial was moved from April 21, 2025 to September 24, 2025, subject to the court’s availability. The lawsuit against Pfizer/BioNTech is ongoing and a date for a claim construction hearing has been scheduled for December 18, 2024.

Strategy

Our strategy is to advance our therapeutic product candidates with complementary mechanisms of action into late-stage clinical trials with the goal of developing a functional cure for people with cHBV infection.

We believe that a combination of compounds that can suppress HBV DNA replication and HBsAg expression as well as boost patients’ HBV-specific immune response could address the most important elements to achieving a functional cure. Functional cure is defined as sustained HBsAg loss and HBV DNA less than the lower limit of quantification (<LLOQ) 24 weeks off treatment, with or without anti-HBsAg antibodies. We are developing imdusiran as a cornerstone in a combination therapy that also includes antivirals and immunologics. We believe that a combination therapy delivered over a finite treatment period that results in a significant increase in the functional cure rate (i.e., a cure rate of at least 20%) would be a meaningful advancement for patients with cHBV infection.

Our HBV product pipeline includes the following:

•Imdusiran is our proprietary, conjugated GalNAc, subcutaneously-delivered RNAi therapeutic product candidate that suppresses all HBV antigens, including HBsAg expression, which is thought to be a key prerequisite to enable reawakening of a patient’s immune system to respond to HBV. Over 250 patients with cHBV infection have been dosed with imdusiran in our Phase 1 and ongoing Phase 2a clinical trials. Clinical data generated thus far has shown imdusiran to be generally safe and well-tolerated, while also providing meaningful reductions in HBsAg and HBV DNA.

•AB-101 is our proprietary oral PD-L1 inhibitor that has the potential to reawaken patients’ HBV-specific immune response by inhibiting PD-L1. AB-101 is currently in a Phase 1a/1b clinical trial (AB-101-001) evaluating the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of single- and multiple-ascending oral doses in healthy subjects and patients with cHBV infection. Parts 1 and 2 of this clinical trial enrolled sequential cohorts of healthy subjects receiving single and multiple doses, respectively, of AB-101 at increasing dose levels. The data showed that AB-101 was generally well-tolerated with evidence of dose-dependent receptor occupancy. We have moved into Part 3 of this clinical trial which evaluates repeat dosing of AB-101 in patients with cHBV, and we expect to report preliminary data in the first half of 2025.

Our strategy is to position imdusiran as a potential cornerstone therapeutic in combination with AB-101 or other agents with potentially complementary mechanisms of action. We are currently conducting two Phase 2a clinical trials combining imdusiran with other agents. The intent of these trials is to initially lower HBsAg levels with imdusiran and then administer a complementary agent, in this case an immune modulator or a therapeutic vaccine, to further lower HBsAg levels and promote

anti-HBV immunity. We believe that if we can lower HBsAg and promote immunity, we may achieve sustained HBsAg loss and HBV DNA <LLOQ, potentially leading to a functional cure.

Our imdusiran development program includes the following Phase 2a clinical trials:

•Imdusiran in combination with Peg-IFNα-2a and ongoing standard-of-care NA therapy in patients with cHBV infection (IM-PROVE I). Preliminary data reported from this IM-PROVE I trial suggest that the addition of a short course of Peg-IFNα-2a to imdusiran treatment was generally safe, well-tolerated and, in some patients, resulted in HBsAg loss at end-of-treatment and sustained HBsAg loss 24 weeks after completing imdusiran and Peg-IFNα-2a treatment. We intend to present additional follow-up data as a late-breaker poster presentation at the upcoming AASLD - The Liver Meeting in November 2024.

•Imdusiran in combination with VTP-300, Barinthus Biotherapeutics plc’s (Barinthus and formerly Vaccitech plc), HBV antigen specific immunotherapy, and ongoing standard-of-care NA therapy in patients with cHBV infection (IM-PROVE II). Preliminary data reported from this IM-PROVE II clinical trial showed that dosing with imdusiran and then VTP-300 achieved statistical significance in lowering HBsAg levels after the end of the treatment period. We are also dosing patients in an additional cohort of this clinical trial that, in addition to imdusiran and VTP-300, includes up to two low doses of nivolumab (Opdivo®), an approved PD-1 monoclonal antibody inhibitor. We intend to present preliminary end-of-treatment data from this additional cohort as a poster presentation at the upcoming AASLD - The Liver Meeting in November 2024.

On July 29, 2024, our Board of Directors approved a plan, effective August 1, 2024, to streamline the organization to focus our efforts on advancing the clinical development of imdusiran and AB-101, and therefore ceased all discovery efforts and discontinued our IM-PROVE III clinical trial. In taking these steps to streamline the organization, we implemented a 40% reduction in our workforce, primarily affecting the discovery and general and administrative functions. As a result, we incurred a one-time restructuring charge in the third quarter of 2024 of approximately $3.6 million, which includes approximately $2.9 million of cash severance and continued benefits payments, a non-cash impairment charge for laboratory equipment of approximately $0.2 million and approximately $0.5 million of cash payments to vendors for close-out activities in connection with the cessation of discovery efforts and the discontinuation of our IM-PROVE III clinical trial. With these organizational changes and our ongoing cost management efforts, we expect our current cash, cash equivalents and investments in marketable securities will be sufficient to fund our operations into the fourth quarter of 2026.

Our Product Candidates

Our pipeline consists of two product candidates that are designed to suppress HBV DNA, reduce HBsAg and/or boost HBV-specific immune responses, as follows:

We continue to explore expansion opportunities for our pipeline through development activities and potential strategic alliances.

RNAi therapeutic (imdusiran, AB-729)

RNAi therapeutics represent a significant advancement in drug development. RNAi therapeutics utilize a natural pathway within cells to silence genes by eliminating the disease-causing proteins that they code for. We are developing an RNAi therapeutic that is designed to reduce HBsAg expression and other HBV antigens in people with cHBV infection. Reducing HBsAg is widely believed to be a key prerequisite to enable a patient’s immune system to reawaken and respond against the virus.

Imdusiran (AB-729) is a subcutaneously-delivered single-trigger RNAi therapeutic targeted to hepatocytes using our proprietary covalently conjugated GalNAc delivery technology. Imdusiran reduces all HBV antigens and inhibits viral replication.

Data from our Phase 1a/1b clinical trial evaluating single and multiple doses of imdusiran in healthy subjects and patients with cHBV (AB-729-001) showed that repeat dosing of 60mg and 90mg of imdusiran at different dosing intervals was well-tolerated and resulted in robust and comparable HBsAg declines and supported our view that 60mg every 8 weeks was an appropriate dose to move forward in our Phase 2a clinical trials.

IM-PROVE I Phase 2a proof-of-concept clinical trial evaluating imdusiran in combination with Peg-IFNα-2a

We have completed enrollment in a randomized, open label, multicenter Phase 2a proof-of-concept clinical trial investigating the safety and antiviral activity of imdusiran in combination with a short course of Peg-IFNα-2a and ongoing NA therapy in 43 stably NA-suppressed, HBeAg negative, non-cirrhotic patients with cHBV infection. The primary objective of this trial is to initially lower HBsAg levels with imdusiran and then administer Peg-IFNα-2a as an immunomodulator to promote anti-HBV immune reawakening. We believe that if we can lower HBsAg and promote immune reawakening, we may achieve sustained HBsAg loss and HBV DNA <LLOQ, potentially leading to a functional cure. After 24-weeks of dosing with imdusiran (60mg every 8 weeks, 4 doses), patients were randomized into one of four arms to receive a short course of Peg-IFNα-2a plus ongoing NA therapy for either 12 or 24 weeks, with or without an additional two doses of imdusiran. After completion of the assigned Peg-IFNα-2a treatment period, all patients remained on NA therapy for the initial 24-week follow-up period, and then discontinued NA treatment, provided they met protocol-defined stopping criteria. Patients who stopped NA therapy entered an intensive follow-up period for 48 weeks.

At the European Association for the Study of the Liver (EASL) Congress in June 2024, we presented data from this clinical trial that suggests that the addition of Peg-IFNα-2a to imdusiran treatment was generally safe, well-tolerated and, in some patients, resulted in HBsAg loss at end-of-treatment and sustained HBsAg loss 24 weeks after completing imdusiran and Peg-IFNα-2a treatment.

Select key data from this Phase 2a clinical trial that was presented at EASL 2024 include:

•33% of patients in Cohort A1 who received 48 weeks of imdusiran (60mg every 8 weeks, 6 doses) combined with 24 weeks of Peg-IFNα-2a and their ongoing NA therapy achieved HBsAg loss at the end-of-treatment (EOT) that was maintained in 100% of these patients 24 weeks after completing imdusiran and Peg-IFNα-2a treatment.

•HBsAg loss was achieved and maintained in 67% of patients with HBsAg less than 1,000 IU/mL at baseline in Cohort A1.

•A total of six patients who received 24 weeks of Peg-IFNα-2a (n=4 Cohort A1; n=2 Cohort A2) seroconverted with HBsAg loss. At the time the data was reported, all six of these patients had stopped NA therapy, with two of those patients reaching 12 weeks off all therapy with sustained undetectable HBV DNA levels and HBsAg loss. The remaining four patients were at various timepoints less than 12 weeks off therapy with undetectable HBV DNA levels and HBsAg loss.

These data from the IM-PROVE I trial suggest that the combination of imdusiran and 24 weeks of Peg-IFNα-2a was generally safe and well-tolerated. There were no serious adverse events related to imdusiran or Peg-IFNα-2a, and no adverse events leading to discontinuation. The most common imdusiran-related treatment emergent adverse events (TEAEs) were transient ALT elevations and injection site bruising. The Peg-IFNα-2a-related TEAEs were consistent with the known safety profile of Peg-IFNα-2a.

We intend to present additional follow-up data as a late-breaker poster presentation at the upcoming AASLD - The Liver Meeting in November 2024.

IM-PROVE II Phase 2a proof-of-concept clinical trial evaluating imdusiran in combination with Barinthus’ VTP-300

Through a clinical collaboration agreement with Barinthus that we entered into in July 2021, we have completed enrollment in IM-PROVE II, a Phase 2a proof-of-concept clinical trial evaluating the safety, antiviral activity and immunogenicity of Barinthus’ VTP-300, an HBV antigen specific immunotherapy, administered after imdusiran in patients with cHBV infection. The initial trial design enrolled 40 NA-suppressed, HBeAg negative or positive, non-cirrhotic cHBV infected patients. The primary objective of this trial was to initially lower HBsAg levels with imdusiran and then administer VTP-300 as an immunomodulator to promote anti-HBV immune reawakening. We believe that if we can lower HBsAg and promote immune reawakening, we may achieve sustained HBsAg loss and HBV DNA <LLOQ, potentially leading to a functional cure. All patients received imdusiran (60mg every 8 weeks, 4 doses) plus NA therapy for 24 weeks. After week 24, treatment with imdusiran was stopped. Patients continued only on NA therapy and were randomized to receive VTP-300 or placebo at week 26 and week 30. At week 48, all patients were evaluated for eligibility to discontinue NA therapy and are followed for an additional 24 to 48 weeks.

Preliminary data were presented at the EASL Congress in June 2024 from 38 of 40 patients in the IM-PROVE II clinical trial that were on stable NA therapy throughout the treatment period, received imdusiran (60mg every 8 weeks, 4 doses) over 24 weeks and were then randomized to receive either VTP-300 (treatment arm) or placebo at Weeks 26 and 30. The data showed that at 24-weeks post-treatment with imdusiran and VTP-300, statistical significance (p<0.05) was achieved in HBsAg levels between the treatment arm (n=5) and placebo (n=6). In addition, more patients maintained HBsAg thresholds of <100 IU/mL and <10 IU/mL when administered VTP-300 versus placebo. Treatment with imdusiran and VTP-300 was generally safe and well-tolerated. There were no serious adverse events, Grade 3 or 4 adverse events or discontinuations due to adverse events.

Additionally, we amended the IM-PROVE II clinical trial protocol to include another cohort that received imdusiran, VTP-300 and low dose nivolumab (Opdivo®), an approved PD-1 inhibitor. In this additional cohort, patients received imdusiran (60mg every 8 weeks, 4 doses) plus NA therapy for 24 weeks, followed by administration of VTP-300 plus up to two low doses of nivolumab while remaining on NA therapy. At week 48, all patients will be evaluated for eligibility to discontinue NA therapy, and will be followed for an additional 24 to 48 weeks. We intend to present preliminary end-of-treatment data from this additional cohort as a poster presentation at the upcoming AASLD - The Liver Meeting in November 2024.

The IM-PROVE II clinical trial is being managed by us, subject to oversight by a joint development committee comprised of representatives from both companies. We and Barinthus retain full rights to our respective product candidates and will split all costs associated with the clinical trial. Pursuant to the agreement, the parties may undertake a larger Phase 2b clinical trial depending on the results of the initial Phase 2a clinical trial.

IM-PROVE III Phase 2a proof-of-concept clinical trial to evaluate imdusiran in combination with durvalumab

We have terminated our Phase 2a clinical trial evaluating the safety, tolerability and antiviral activity of imdusiran and NA therapy in combination with intermittent low doses of durvalumab, an approved anti-PD-L1 monoclonal antibody, in patients with cHBV infection (IM-PROVE III) prior to dosing any participants. This decision was based on a prioritization of resources and the projected availability of clinical data from this trial.

Oral PD-L1 Inhibitor (AB-101)

PD-L1 inhibitors complement our pipeline of agents and could potentially be an important part of a combination therapy for the treatment of HBV by reawakening the immune system. Highly functional HBV-specific T-cells within our immune system are believed to be required for long-term HBV viral resolution. However, HBV-specific T-cells become functionally defective, and greatly reduced in their frequency during cHBV infection. One approach to boost HBV-specific T-cells is to prevent PD-L1 proteins from binding to PD-1 and thus inhibiting the HBV-specific immune function of T-cells. Immune checkpoints such as PD-1/PD-L1 play an important role in the induction and maintenance of immune tolerance and in T-cell activation.

AB-101 is our proprietary oral small-molecule PD-L1 inhibitor candidate that we believe will allow for controlled checkpoint blockade while minimizing the systemic safety issues typically seen with checkpoint inhibitor antibody therapies. AB-101 is differentiated from monoclonal antibody checkpoint inhibitors such as durvalumab (anti-PD-L1) and nivolumab (anti-PD-1) because it is liver centric, has a much shorter duration of effect which may provide dosing and safety advantages, and has a novel mechanism of action as it binds to PD-L1 on the surface of cells causing dimerization and internalization of the PD-L1 protein followed by degradation within hours.

Preclinical data indicates that AB-101 mediates activation and reinvigoration of HBV-specific T-cells from cHBV infected patients. In June 2022, we presented a poster at the 2022 EASL ILC highlighting data from a study that was designed to assess

the preclinical activity of AB-101 and the compound’s ability to reinvigorate patient HBV-specific T-cells. Studies were conducted using a transgenic MC38 tumor mouse model and peripheral blood mononuclear cells (PBMCs) from cHBV infected patients. The data presented showed that once daily oral administration of AB-101 resulted in profound tumor reduction that was associated with T-cell activation. In addition, AB-101 activates and reinvigorates HBV-specific T-cells in vitro. Additionally, preclinical data in an HBV mouse model were presented at the 2022 AASLD Liver Meeting showing that monotherapy with AB-101 reduced PD-L1 in liver immune cells, confirming liver target engagement of the compound. Combination treatment with AB-101 and an HBV-targeting GalNAc-siRNA agent resulted in activation and increased frequency of HBV-specific T-cells and greater anti-HBsAg antibody production. This favorable preclinical profile supports further development of AB-101 as a therapeutic modality for cHBV infection treatment. We believe AB-101, when used in combination with imdusiran or other approved and investigational agents, could potentially lead to a functional cure in HBV chronically infected patients.

In April 2023, we received verbal communication from the FDA that the AB-101 IND application had been placed on clinical hold. For purposes of clarity, the Phase 1 clinical trial had not been initiated and we had not dosed any patients with AB-101. In May 2023, we received the clinical hold letter from the FDA, which raised questions about certain preclinical data and aspects of the clinical trial design. We thus decided to pursue other regulatory pathways outside of the US while evaluating our path forward with the FDA. In July 2023, the New Zealand Medicine Safety Authority (Medsafe) approved our clinical trial application (CTA) for a Phase 1 clinical trial in New Zealand for AB-101, and we believe the protocol approved by Medsafe adequately addresses the clinical trial design and safety monitoring issues raised by the FDA. We included the clinical hold letter from the FDA as part of our CTA application with Medsafe. Subsequent to its approval in New Zealand, our CTA for this Phase 1 clinical trial with AB-101 was approved in several additional countries outside of the U.S.

Phase 1a/1b clinical trial to evaluate safety, tolerability and PK/PD of AB-101 (AB-101-001)

We are currently dosing study subject in our Phase 1a/1b clinical trial for AB-101 (AB-101-001). The AB-101-001 clinical trial is designed to investigate the safety, tolerability and PK/PD of single and multiple-ascending oral doses of AB-101 for up to 28 days in healthy subjects and patients with cHBV infection. The trial consists of three parts starting with single ascending doses in healthy subjects, followed by multiple ascending doses in healthy subjects and culminating with multiple doses in patients with cHBV infection. Safety and PK/PD assessments are performed prior to dose escalation in all parts of the clinical trial.

Part 1 of this clinical trial enrolled four sequential cohorts of eight healthy subjects each (6 active: 2 placebo) receiving a single dose of AB-101 at increasing dose levels. The data showed that AB-101 was well-tolerated with evidence of dose-dependent receptor occupancy. In the 25mg cohort, all five evaluable subjects showed evidence of receptor occupancy between 50-100%.

Part 2 of this clinical trial has enrolled to date two sequential cohorts of ten healthy subjects each receiving 10 mg or 25 mg of AB-101 (8 active: 2 placebo) daily for seven days. AB-101 was generally well-tolerated after repeat dosing with evidence of dose-dependent receptor occupancy. In the 25mg cohort, all subjects showed evidence of receptor occupancy, with seven of the eight subjects demonstrating receptor occupancy greater than 70% during the seven-day dosing period.

We have moved into Part 3 of this clinical trial which evaluates repeat dosing of AB-101 for 28 days in patients with cHBV and we expect to report preliminary data in the first half of 2025.   

Other Collaborations, Royalty Entitlements and Intellectual Property Litigation

Collaboration with Qilu Pharmaceutical Co., Ltd. (Qilu)

In December 2021, we entered into a technology transfer and license agreement (the License Agreement) with Qilu, pursuant to which we granted Qilu a sublicensable, royalty-bearing license, under certain intellectual property owned by us, which is non-exclusive as to development and manufacturing and exclusive with respect to commercialization of imdusiran, including pharmaceutical products that include imdusiran, for the treatment or prevention of hepatitis B in China, Hong Kong, Macau and Taiwan (the Territory).

In partial consideration for the rights granted by us, Qilu paid us a one-time upfront cash payment of $40 million on January 5, 2022 and agreed to pay us milestone payments totaling up to $245 million, net of withholding taxes, upon the achievement of certain technology transfer, development, regulatory and commercialization milestones. Qilu also agreed to pay us double-digit royalties into the low twenties percent based upon annual net sales of imdusiran in the Territory. The royalties are payable on a product-by-product and region-by-region basis, subject to certain limitations.

Qilu is responsible for all costs related to developing, obtaining regulatory approval for, and commercializing imdusiran for the treatment or prevention of hepatitis B in the Territory. Qilu is required to use commercially reasonable efforts to develop, seek regulatory approval for, and commercialize at least one imdusiran product candidate in the Territory. A joint development committee has been established between us and Qilu to coordinate and review the development, manufacturing and commercialization plans. Both parties also have entered into a supply agreement and related quality agreement pursuant to which we will manufacture or have manufactured and supply Qilu with all quantities of imdusiran necessary for Qilu to develop and commercialize in the Territory until we have completed manufacturing technology transfer to Qilu and Qilu has received all approvals required for it or its designated contract manufacturing organization to manufacture imdusiran in the Territory.

Concurrent with the execution of the License Agreement, we entered into a Share Purchase Agreement (the Share Purchase Agreement) with Anchor Life Limited, a company established pursuant to the applicable laws and regulations of Hong Kong and an affiliate of Qilu (the Investor), pursuant to which the Investor purchased 3,579,952 of our common shares at a purchase price of USD $4.19 per share, which was a 15% premium on the thirty-day average closing price of our common shares as of the close of trading on December 10, 2021 (the Share Transaction). We received $15.0 million of gross proceeds from the Share Transaction on January 6, 2022. The common shares sold to the Investor in the Share Transaction represented approximately 2.5% of our common shares outstanding immediately prior to the execution of the Share Purchase Agreement.

Alnylam Pharmaceuticals, Inc. (Alnylam) and Acuitas Therapeutics, Inc. (Acuitas)

We have two royalty entitlements to Alnylam’s global net sales of ONPATTRO.

In 2012, we entered into a license agreement with Alnylam that entitles Alnylam to develop and commercialize products with our LNP delivery technology. Alnylam’s ONPATTRO, which represents the first approved application of our LNP technology, was approved by the FDA and the European Medicines Agency (EMA) during the third quarter of 2018 and was launched by Alnylam immediately upon approval in the United States. Under the terms of this license agreement, we are entitled to tiered royalty payments on global net sales of ONPATTRO ranging from 1.00% - 2.33% after offsets, with the highest tier applicable to annual net sales above $500 million. This royalty interest was sold to the Ontario Municipal Employees Retirement System (OMERS), effective as of January 1, 2019, for $20 million in gross proceeds before advisory fees. OMERS will retain this entitlement until it has received $30 million in royalties, at which point 100% of this royalty entitlement on future global net sales of ONPATTRO will revert to us. OMERS has assumed the risk of collecting up to $30 million of future royalty payments from Alnylam and we are not obligated to reimburse OMERS if they fail to collect any such future royalties. If this royalty entitlement reverts to us, it has the potential to provide an active royalty stream or to be otherwise monetized again in full or in part. From the inception of the royalty sale through September 30, 2024, an aggregate of $24.4 million of royalties have been earned by OMERS.

We also have rights to a second royalty interest ranging from 0.75% to 1.125% on global net sales of ONPATTRO, with 0.75% applying to sales greater than $500 million, originating from a settlement agreement and subsequent license agreement with Acuitas. This royalty entitlement from Acuitas has been retained by us and was not part of the royalty entitlement sale to OMERS.

Genevant Sciences, Ltd.

In April 2018, we entered into an agreement with Roivant Sciences Ltd. (Roivant), our largest shareholder, to launch Genevant, a company focused on a broad range of RNA-based therapeutics enabled by our LNP and ligand conjugate delivery technologies. We licensed rights to our LNP and ligand conjugate delivery platforms to Genevant for RNA-based applications outside of HBV, except to the extent certain rights had already been licensed to other third parties (the Genevant License). We retained all rights to our LNP and conjugate delivery platforms for HBV.

Under the Genevant License, as amended, if a third party sublicensee of intellectual property licensed by Genevant from us commercializes a sublicensed product, we become entitled to receive a specified percentage of certain revenue that may be received by Genevant for such sublicense, including royalties, commercial milestones and other sales-related revenue, or, if less, tiered low single-digit royalties on net sales of the sublicensed product. The specified percentage is 20% in the case of a mere sublicense (i.e., naked sublicense) by Genevant without additional contribution and 14% in the case of a bona fide collaboration with Genevant.

Additionally, if Genevant receives proceeds from an action for infringement by any third parties of our intellectual property licensed to Genevant, we would be entitled to receive, after deduction of litigation costs, 20% of the proceeds received by

Genevant or, if less, tiered low single-digit royalties on net sales of the infringing product (inclusive of the proceeds from litigation or settlement, which would be treated as net sales).

In July 2020, Roivant recapitalized Genevant through an equity investment and conversion of previously issued convertible debt securities held by Roivant. We participated in the recapitalization of Genevant with an equity investment of $2.5 million. In connection with the recapitalization, the three parties entered into an Amended and Restated Shareholders Agreement that provides Roivant with substantial control of Genevant. We have a non-voting observer seat on Genevant’s Board of Directors.

As of September 30, 2024, we owned approximately 16% of the common equity of Genevant and the carrying value of our investment in Genevant was zero. Our entitlement to receive future royalties or sublicensing revenue from Genevant was not impacted by the recapitalization.

Moderna Inter Partes Review Petition

On February 21, 2018, Moderna Therapeutics, Inc. (Moderna) filed a petition requesting the United States Patent and Trademark Office to institute an Inter Partes Review of Arbutus United States Patent 9,404,127 (the ’127 Patent). In its petition, Moderna sought to invalidate all claims of the patent based on Moderna’s allegation that the claims are anticipated and/or obvious. We filed a response to Moderna’s petition on June 14, 2018. On September 12, 2018, the Patent Trial and Appeal Board (the PTAB) rendered its decision to institute Inter Partes Review of the ‘127 Patent. The ‘127 Patent represents only a fraction of our extensive LNP patent portfolio.

With respect to the ‘127 Patent, the PTAB held all claims as invalid on September 10, 2019, by reason of anticipatory prior art. However, this decision was vacated and sent back (remanded) to the PTAB for a rehearing, pending the U.S. Supreme Court’s (Supreme Court) decision whether to grant certiorari in a different case, United States v. Athrex, Inc. (US v. Athrex), the holding of which could impact the findings in the ‘127 Patent matter. The Supreme Court granted certiorari in US v. Athrex on October 13, 2020 (i.e., agreed to review the decision appealed from a lower court). Until the Supreme Court rendered its opinion in US v. Athrex, the ‘127 Patent hearing remained in abeyance, with no decision reached as to the validity of its claims. The Supreme Court decided on the US v. Athrex case on June 21, 2021, following which the Federal Circuit reinstated the appeal sua sponte, requiring the parties to brief how the case should proceed in light of the Supreme Court’s opinion or for the Appellant to waive the challenge. We elected to waive the challenge and proceed with the appeal at the Federal Circuit. The opening brief was filed on October 25, 2021. Moderna’s responsive brief was filed on February 24, 2022 and our reply brief was filed on April 26, 2022. An oral hearing for this matter was held on November 4, 2022. On April 11, 2023, the Federal Circuit rendered its opinion, affirming the PTAB’s finding that all claims of the ‘127 Patent are invalid by reason of anticipation.

Moderna and Merck European Opposition

On April 5, 2018, Moderna and Merck, Sharp & Dohme Corporation (Merck) filed Notices of Opposition to Arbutus’ European patent EP 2279254 (the ’254 Patent) with the European Patent Office (EPO), requesting that the ‘254 Patent be revoked in its entirety for all contracting states. We filed a response to Moderna and Merck’s oppositions on September 3, 2018. A hearing was conducted before the Opposition Division of the EPO on October 10, 2019. At the conclusion of the hearing, the EPO upheld an auxiliary request adopting the amendment, as put forth by us, of certain claims of the ‘254 Patent. In February 2020 Moderna and Merck filed Notices of Appeal challenging the EPO’s grant of the auxiliary request. Merck filed its notice of appeal on February 24, 2020 and Moderna on February 27, 2020. Both Merck and Moderna perfected their appeals by filing Grounds of Appeal on April 30, 2020. We filed our responses to the appeals on September 18, 2020. On March 22, 2022, Moderna filed further written submissions to which we and Genevant responded in August 2022. On April 18, 2023, we and Genevant withdrew our auxiliary request, however, the original (main) request remains in the action. We and Moderna informed the Board of Appeals that we would not object to a remittance of the matter without a hearing to the Opposition Division of the EPO. The hearing in this matter before the Board of Appeals was subsequently cancelled and resubmitted to the Opposition Division (i.e., lower board) of the EPO. On October 31, 2023, the Opposition Division issued a summons for oral proceedings and provided its preliminary and non-binding opinion on the subject matter to be discussed at the hearing. On November 3, 2023, we responded to the summons and on January 15, 2024, Moderna and Merck filed their reply to the written opinion of the Opposition Division, as well as to our written submission of November 3, 2023. We responded to Moderna and Merck’s reply on April 5, 2024. Oral proceedings were held on June 6, 2024, and the Opposition Division upheld the ‘254 Patent but declined our and Genevant’s request to broaden certain claims in the ‘254 Patent. Both parties have given notice of their intent to appeal the Opposition Division’s decision, and the deadline for filing for their respective grounds for appeal is November 25, 2024.

While we are the patent holder, the ‘127 Patent, the ‘254 Patent, the other patents in our LNP portfolio have been licensed to Genevant and are included in the rights licensed by us to Genevant under the Genevant License.

Patent Infringement Litigation vs. Moderna

On February 28, 2022, we and Genevant filed a lawsuit in the U.S. District Court for the District of Delaware against Moderna, Inc. and a Moderna affiliate (collectively, Moderna) seeking damages for infringement of U.S. Patent Nos. 8,058,069, 8,492,359, 8,822,668, 9,364,435, 9,504,651, and 11,141,378 in the manufacture and sale of MRNA-1273, Moderna’s vaccine for COVID-19. The patents relate to nucleic acid-lipid particles and lipid vesicles, as well as compositions and methods for their use. The lawsuit does not seek an injunction or otherwise seek to impede the sale, manufacture or distribution of MRNA-1273. However, we seek fair compensation for Moderna’s use of our patented technology that was developed with great effort and at great expense, without which Moderna’s COVID-19 vaccine would not have been successful. On May 6, 2022, Moderna filed a partial motion to dismiss the claims “relating to Moderna’s sale and provision of COVID-19 vaccine doses to the U.S. Government.” On November 2, 2022, the court issued an Order denying Moderna’s motion. On November 30, 2022, Moderna filed its Answer to the Complaint and Counterclaims. We and Genevant filed our Answer to Moderna’s Counterclaims on December 21, 2022. On February 14, 2023, the U.S. Department of Justice filed a Statement of Interest in the action. On February 16, 2023, the court held an Initial Pretrial Conference after which it issued an Order, dated February 16, 2023, ordering that within 14 days of the issuance of the Order, the parties and the U.S. Government were to submit letters regarding the impact of the Governments’ Statement of Interest on the scheduling of the matter. On March 10, 2023, the court reaffirmed its denial of Moderna’s motion to dismiss. On March 16, 2023, the court held a Rule 16 scheduling conference, and on March 21, 2023, the court issued a scheduling order in the matter without setting a trial date. On June 9, 2023, the court granted the parties’ request to extend the time for claim construction briefing. The claim construction hearing was held on February 8, 2024. On April 3, 2024, the court issued its opinion regarding the claims construction. The court agreed with both of our positions regarding the Composition of Total Lipid (‘069) Patent that: (i) the claimed molar percentage (mol. %) ranges can be met by any particle and is not limited to “finished” particles that are not subjected to further process steps; and (ii) that the claimed mol. % ranges include standard variation based on the number of significant figures recited in the claim. The court also agreed with our position regarding the Cationic Lipid with Protonatable Tertiary Amine (‘378) Patent that there is no limitation as to the mol. % of the claimed cationic lipid. Regarding the Encapsulation of mRNA (‘651) Patent, the court held that “wherein at least 70% / at least 80% / about 90% of the mRNA in the formulation is fully encapsulated in the lipid vesicles” means “wherein at least 70% / at least 80% / about 90% of the mRNA is fully, as distinct from partially, contained inside the lipid vesicles”. On August 5, 2024, we and Genevant, along with Moderna, filed the Stipulation with the court that requested an amended case schedule to accommodate certain outstanding discovery from Moderna and third parties. The court approved the amended case schedule and the start of the trial was moved from April 21, 2025 to September 24, 2025, subject to the court’s availability.

Patent Infringement Litigation vs. Pfizer and BioNTech

On April 4, 2023, we and Genevant filed a lawsuit in the U.S. District Court for the District of New Jersey against Pfizer Inc. (Pfizer) and BioNTech SE (BioNTech) seeking damages for infringement of U.S. Patent Nos. 9,504,651; 8,492,359; 11,141,378; 11,298,320; and 11,318,098 in the manufacture and sale of any COVID-19 mRNA-LNP vaccines. The patents relate to nucleic acid-lipid particles and their composition, manufacture, delivery and methods of use. The lawsuit does not seek an injunction or otherwise seek to impede the sale, manufacture or distribution of any COVID-19 mRNA-LNP vaccines. However, we seek fair compensation for Pfizer’s and BioNTech’s use of our patented technology that was developed with great effort and at great expense, without which their COVID-19 mRNA-LNP vaccines would not have been successful. On July 10, 2023, Pfizer and BioNTech filed their answer to the complaint, affirmative defenses and counterclaims. We and Genevant filed our answer to these counterclaims on August 14, 2023. A scheduling conference was held on August 28, 2023 and the court issued a Letter Order on September 7, 2023 setting certain court dates. Subsequently, the claim construction hearing was scheduled for December 18, 2024. Scheduling of subsequent case dates, including the date for trial, will be set at a later time that is yet to be determined. Document and written discovery in the action is ongoing.

Acuitas Declaratory Judgment Lawsuit

On March 18, 2022, Acuitas filed a lawsuit against us and Genevant in the U.S. District Court for the Southern District of New York, asking the court to enter declaratory judgment that Arbutus patent Nos. 8,058,069, 8,492,359, 8,822,668, 9,006,417, 9,364,435, 9,404,127, 9,504,651, 9,518,272, and 11,141,378 do not infringe Pfizer and BioNTech’s COVID-19 vaccine, COMIRNATY, which uses an mRNA lipid provided, under license, by Acuitas. Acuitas also seeks a declaration that each of the listed patents is invalid. On June 24, 2022, we and Genevant sought a pre-motion conference concerning our anticipated motion to dismiss all of Acuitas’ claims due to lack of subject matter jurisdiction. The request for a pre-motion conference was

granted, but the case was subsequently re-assigned to a new judge who entered an order directing: (i) Acuitas to inform the court whether it intended to file an amended complaint; (ii) that Acuitas must file any amended complaint by a certain date; and (iii) that if Acuitas did not file an amended complaint, we and Genevant must file our motion to dismiss by a certain date. Acuitas filed its amended complaint on September 6, 2022. On October 4, 2022, we and Genevant filed our motion to dismiss the Acuitas action for lack of subject matter jurisdiction based on the lack of a case or controversy. Acuitas filed its opposition to the motion to dismiss on November 1, 2022, and we and Genevant filed our reply brief on November 16, 2022 at which point the motion was fully briefed. A status conference for the action was set for August 9, 2023, however on August 4, 2023, Acuitas voluntarily dismissed its complaint in the Southern District of New York and refiled a virtually identical complaint in the District Court of New Jersey (D. N.J.) where the Pfizer/BioNTech matter is currently pending, except that the 9,404,127 patent is not at issue in the New Jersey action, and Acuitas also added two additional patents to its New Jersey declaratory judgment action (U.S. Patent Nos. 11,298,320 and 11,318,098) that were not at issue in its New York action. On September 15, 2023, we and Genevant filed a letter with the court seeking a premotion conference for a motion to dismiss and subsequently filed our and Genevant’s motion to dismiss on October 13, 2023. Acuitas filed its opposition on November 1, 2023 and we and Genevant filed our reply on November 16, 2023. Acuitas filed a request to commence discovery on November 18, 2023, to which we and Genevant responded on November 20, 2023. On May 20, 2024, the court granted our and Genevant’s motion to dismiss, so we believe this matter is now concluded.

CRITICAL ACCOUNTING POLICIES AND SIGNIFICANT JUDGEMENTS AND ESTIMATES

This management’s discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which have been prepared in accordance with United States generally accepted accounting principles. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We believe there have been no significant changes in our critical accounting policies and estimates as discussed in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the year ended December 31, 2023.

RECENT ACCOUNTING PRONOUNCEMENTS

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board or other standard setting bodies that are adopted by us as of the specified effective date. Unless otherwise discussed, we believe that the impact of recently issued standards that are not yet effective will not have a material impact on our financial position or results of operations upon adoption.

Please refer to Note 2 to our condensed consolidated financial statements included in “Part I, Item 1-Financial Statements (Unaudited)” of this Form 10-Q for a description of recent accounting pronouncements applicable to our business.

RESULTS OF OPERATIONS

The following summarizes the results of our operations for the periods shown:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands)
Total revenue	$	1,339	$	4,658	$	4,597	$	15,996
Operating expenses	22,779		26,216		66,983		73,352
Loss from operations	(21,440)		(21,558)		(62,386)		(57,356)
Other income	1,723		1,454		4,998		3,819
Net loss	$	(19,717)	$	(20,104)	$	(57,388)	$	(53,537)

Revenue

Revenues are summarized in the following tables:


	Three Months Ended September 30,
	2024		% of Total		2023		% of Total
	(in thousands, except percentages)
Revenue from collaborations and licenses
Royalties from sales of ONPATTRO	$	644	48	%	$	714	15	%
Qilu Pharmaceutical Co., Ltd.	123		9	%	3,221		69	%

Non-cash royalty revenue
Royalties from sales of ONPATTRO	572		43	%	723		16	%
Total revenue	$	1,339	100	%	$	4,658	100	%


	Nine Months Ended September 30,
	2024		% of Total		2023		% of Total
	(in thousands, except percentages)
Revenue from collaborations and licenses
Royalties from sales of ONPATTRO	$	1,981	43	%	$	2,980	19	%
Qilu Pharmaceutical Co., Ltd.	880		19	%	10,349		65	%

Non-cash royalty revenue
Royalties from sales of ONPATTRO	1,736		38	%	2,667		17	%
Total revenue	$	4,597	100	%	$	15,996	100	%

Total revenue decreased $3.3 million and $11.4 million for the three and nine months ended September 30, 2024, respectively, compared to the same periods in 2023, due primarily to: i) a decrease in license revenue recognized related to our progress towards the satisfaction of our performance obligations with respect to the technology transfer and licensing agreement with Qilu; and ii) a decrease in license royalty revenue from Alnylam and Acuitas due to lower sales of ONPATTRO in 2024 compared to 2023.

Operating expenses

Operating expenses are summarized in the following tables:


	Three Months Ended September 30,
	2024		% of Total		2023		% of Total
	(in thousands, except percentages)
Research and development	$	14,273	63	%	$	20,169	77	%
General and administrative	4,537		20	%	5,842		22	%
Change in fair value of contingent consideration	344		2	%	205		1	%
Restructuring	3,625		16	%	—		—	%
Total operating expenses	$	22,779	100	%	$	26,216	100	%



	Nine Months Ended September 30,
	2024		% of Total		2023		% of Total
	(in thousands, except percentages)
Research and development	$	45,227	68	%	$	56,136	77	%
General and administrative	17,396		26	%	17,374		24	%
Change in fair value of contingent consideration	735		1	%	(158)		—	%
Restructuring	3,625		5	%	—		—	%
Total operating expenses	$	66,983	100	%	$	73,352	100	%

Research and development

Research and development expenses consist primarily of personnel expenses, fees paid to clinical research organizations and contract manufacturers, consumables and materials, consulting, and other third party expenses to support our clinical and preclinical activities, as well as a portion of stock-based compensation and general overhead costs.

Research and development expenses decreased $5.9 million and $10.9 million for the three and nine months ended September 30, 2024, respectively, compared to the same periods in 2023. The decreases were due primarily to the discontinuation of our coronavirus and AB-161 programs in September 2023, along with related headcount reductions, as part of our efforts to focus our pipeline on our lead HBV product candidates. In connection with our cessation of all discovery efforts in August 2024, we expect our research expenses to continue to be reduced in future periods.

A significant portion of our research and development expenses are not tracked by project as they benefit multiple projects or our technology platform and because our most-advanced programs are not yet in late-stage clinical development.

General and administrative

General and administrative expenses decreased $1.3 million for the three months ended September 30, 2024, as compared to the same period in 2023, due primarily to decreased employee compensation-related expenses associated with a reduction in headcount in connection with the prioritization of our HBV pipeline in September 2023. Total general and administrative expenses remained substantially similar for the nine months ended September 30, 2024 compared to the same period in 2023, with higher litigation-related legal fees offset by a reduction in employee compensation-related expenses and insurance premiums.

Change in fair value of contingent consideration

Contingent consideration is a liability related to our acquisition of Enantigen Therapeutics, Inc. in October 2014. In general, as time passes and assuming no changes to the assumptions related to the contingency, the fair value of the contingent consideration increases as the progress of our programs get closer to triggering contingent payments based on certain sales milestones of our first commercial product for cHBV. As imdusiran continues to progress through Phase 2a proof-of-concept clinical trials, we will adjust our assumptions regarding probability of success commensurate with the progression of the program, which will increase the fair value of the liability.

Restructuring

During the three months ended September 30, 2024, we ceased all discovery efforts and discontinued our IM-PROVE III clinical trial to streamline the organization to focus our efforts on advancing the clinical development of imdusiran and AB-101. In taking these steps, we implemented a 40% reduction in our workforce, primarily affecting the discovery and general and administrative functions. As a result, we incurred a one-time restructuring charge in the third quarter of 2024 of approximately $3.6 million, which includes approximately $2.9 million of cash severance and continued benefits payments, a non-cash impairment charge for laboratory equipment of approximately $0.2 million and approximately $0.5 million of cash payments to vendors for close-out activities in connection with the cessation of discovery efforts and the discontinuation of our IM-PROVE III clinical trial.

Other income (loss)

The components of our other income (loss) are summarized in the following table:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands)
Interest income	$	1,747	$	1,494	$	5,121	$	4,223
Interest expense	(29)		(46)		(107)		(415)
Foreign exchange gain/(loss)	5		6		(16)		11
Total other income	$	1,723	$	1,454	$	4,998	$	3,819

Interest income

The increase in interest income for the three and nine months ended September 30, 2024 compared to the same periods in 2023 was due primarily to higher interest earned on our cash and investment balances due to a general increase in market interest rates. We anticipate a decrease in interest income in immediate future periods due to lower interest earned on our cash and investment balances due to a general decrease in market interest rates.

Interest expense

Interest expense for the three and nine months ended September 30, 2024 and 2023 consisted primarily of non-cash amortization of discount and issuance costs related to the sale of a portion of our ONPATTRO royalty interest to OMERS in July 2019. The decrease is related to the declining balance of the unamortized discount and issuance costs.

LIQUIDITY AND CAPITAL RESOURCES

The following table summarizes our cash flow activities for the periods indicated:


	Nine Months Ended September 30,
	2024		2023
	(in thousands)
Net loss	$	(57,388)	$	(53,537)
Non-cash items	5,453		4,613
Change in deferred license revenue	(880)		(10,349)
Net change in operating items	(1,720)		(9,371)
Net cash used in operating activities	(54,535)		(68,644)
Net cash provided by investing activities	9,537		28,548
Issuance of common shares pursuant to the Open Market Sale Agreement	44,124		26,000
Cash provided by other financing activities	6,451		840
Net cash provided by financing activities	50,575		26,840
Effect of foreign exchange rate changes on cash and cash equivalents	(16)		11
Increase/(decrease) in cash and cash equivalents	5,561		(13,245)
Cash and cash equivalents, beginning of period	26,285		30,776
Cash and cash equivalents, end of period	$	31,846	$	17,531

Since our incorporation, we have financed our operations through sales of equity, debt, revenues from research and development collaborations and licenses with corporate partners, royalty monetization, interest income on funds available for investment, and government contracts, grants and tax credits.

For the nine months ended September 30, 2024, $54.5 million of cash was used in operating activities compared to $68.6 million used in operating activities for the nine months ended September 30, 2023, a change of $14.1 million. The change was due primarily to a decrease in research and development expenses related to our HBV pipeline prioritization in September 2023 and the timing of payments to vendors.

For the nine months ended September 30, 2024, net cash provided by investing activities was $9.5 million, resulting primarily from maturities of investments in marketable securities of $108.0 million, partially offset by additional investments in marketable securities of $98.3 million. For the nine months ended September 30, 2023, net cash provided by investing activities was $28.5 million, which resulted primarily from maturities of investments in marketable securities of $86.0 million, partially offset by additional investments in marketable securities of $56.5 million.

For the nine months ended September 30, 2024, net cash provided by financing activities was $50.6 million, which was primarily related to $44.1 million in proceeds from sales of common shares under the Sale Agreement and $6.1 million in proceeds from the issuance of common shares pursuant to the exercise of stock options. For the nine months ended September 30, 2023, net cash provided by financing activities was $26.8 million, which included $26.0 million in proceeds from sales of common shares under the Sale Agreement.

Sources of Liquidity

As of September 30, 2024, we had cash, cash equivalents and investments in marketable securities of $130.8 million. We had no outstanding debt as of September 30, 2024.

Open Market Sale Agreement

We have an Open Market Sale AgreementSM with Jefferies dated December 20, 2018, as amended by Amendment No. 1, dated December 20, 2019, Amendment No. 2, dated August 7, 2020 and Amendment No. 3, dated March 4, 2021 (as amended, the Sale Agreement), under which we may offer and sell common shares, from time to time.

On December 23, 2019, we filed a shelf registration statement on Form S-3 with the SEC (File No. 333-235674) and accompanying base prospectus, declared effective by the SEC on January 10, 2020 (the January 2020 Registration Statement),

for the offer and sale of up to $150 million of our securities. The January 2020 Registration Statement also contained a prospectus supplement for an offering of up to $50.0 million of our common shares pursuant to the Sale Agreement. This prospectus supplement was fully utilized during 2020. On August 7, 2020, we filed a prospectus supplement with the SEC (the August 2020 Prospectus Supplement) for an offering of up to an additional $75.0 million of our common shares pursuant to the Sale Agreement under the January 2020 Registration Statement. The August 2020 Prospectus Supplement was fully utilized during 2020. The January 2020 Registration Statement expired in January 2023.

On August 28, 2020, we filed a shelf registration statement on Form S-3 with the SEC (File No. 333-248467) and accompanying base prospectus, declared effective by the SEC on October 22, 2020 (the October 2020 Registration Statement), for the offer and sale of up to $200 million of our securities. On March 4, 2021, we filed a prospectus supplement with the SEC in connection with the offering of up to an additional $75.0 million of our common shares pursuant to the Sale Agreement under the October 2020 Registration Statement, which we fully utilized during 2021. On October 8, 2021, we filed a prospectus supplement with the SEC for the offer and sale of up to an additional $75.0 million of our common shares pursuant to the Sale Agreement under the October 2020 Registration Statement.

On November 4, 2021, we filed a shelf registration statement on Form S-3 with the SEC (File No. 333-260782) and accompanying base prospectus, declared effective by the SEC on November 18, 2021 (the November 2021 Registration Statement), for the offer and sale of up to $250 million of our securities.

On March 3, 2022, we filed a prospectus supplement with the SEC (the March 2022 Prospectus Supplement) for the offer and sale of up to an additional $100.0 million of our common shares pursuant to the Sale Agreement under: (i) the January 2020 Registration Statement; (ii) the October 2020 Registration Statement; and (iii) the November 2021 Registration Statement, of which only the November 2021 Registration Statement remains active.

In October 2023, the October 2020 Registration Statement expired with $29.3 million that was not utilized under the October 2021 Prospectus Supplement, leaving $75.0 million remaining available under the March 2022 Prospectus Supplement pursuant to the November 2021 Registration Statement.

During the nine months ended September 30, 2024, we issued 16,499,999 common shares pursuant to the Sale Agreement resulting in net proceeds of approximately $44.1 million. For the nine months ended September 30, 2023, we issued 9,848,090 common shares pursuant to the Sale Agreement, resulting in net proceeds of approximately $26.0 million. As of September 30, 2024, there was approximately $25.4 million available under the March 2022 Prospectus Supplement.

Royalty Entitlements

We have a royalty entitlement on ONPATTRO, a drug developed by Alnylam that incorporates our LNP technology and was approved by the FDA and the EMA during the third quarter of 2018 and was launched by Alnylam immediately upon approval in the United States. In July 2019, we sold a portion of this royalty interest to OMERS, effective as of January 1, 2019, for $20 million in gross proceeds before advisory fees. OMERS will retain this entitlement until it has received $30 million in royalties, at which point 100% of such royalty interest on future global net sales of ONPATTRO will revert to us. OMERS has assumed the risk of collecting up to $30 million of future royalty payments from Alnylam and we are not obligated to reimburse OMERS if they fail to collect any such future royalties. From the inception of the royalty sale through September 30, 2024, we have recorded an aggregate of $24.4 million of non-cash royalty revenue for royalties earned by OMERS. If this royalty entitlement reverts to us, it has the potential to provide an active royalty stream or to be otherwise monetized again in full or in part. In addition to the royalty from the Alnylam LNP license agreement, we are also receiving a second, lower royalty interest on global net sales of ONPATTRO originating from a settlement agreement and subsequent license agreement with Acuitas. The royalty from Acuitas has been retained by us and was not part of the royalty sale to OMERS.

In December 2021, we entered into a technology transfer and exclusive licensing agreement with Qilu pursuant to which we granted Qilu an exclusive (with certain exceptions), sublicensable, royalty-bearing license, under certain intellectual property owned by us, to develop, manufacture and commercialize imdusiran for the treatment or prevention of cHBV in the Territory. In partial consideration for the rights granted by us, Qilu paid us a one-time upfront cash payment of $40 million and made an equity investment in us of $15.0 million, both received in January 2022, and agreed to pay us milestone payments totaling up to $245 million, net of withholding taxes, upon the achievement of certain technology transfer, development, regulatory and commercialization milestones. Qilu also agreed to pay us double-digit royalties into the low twenties percent based upon annual net sales of imdusiran in the Territory.

Cash requirements

We believe that our $130.8 million of cash, cash equivalents and investments in marketable securities as of September 30, 2024 will be sufficient to fund our operations for at least the next twelve months and into the fourth quarter of 2026. We expect a net cash burn between $63 million and $67 million in 2024. In the future, substantial additional funds will be required to continue with the active development of our pipeline products and technologies. In particular, our funding needs may vary depending on a number of factors including:

•revenue earned from our legacy collaborative partnerships and licensing agreements, including potential royalty payments from Alnylam’s ONPATTRO;

•revenue earned from ongoing collaborative partnerships, including milestone and royalty payments;

•the potential requirement to make milestone payments related to our legacy agreements;

•the extent to which we continue the development of our product candidates, add new product candidates to our pipeline, or form collaborative relationships or licensing arrangements to advance our product candidates;

•delays in the development of our product candidates due to clinical findings;

•our decisions to in-license or acquire additional products, product candidates or technology for development;

•our ability to attract and retain development or commercialization partners, and their effectiveness in carrying out the development and ultimate commercialization of one or more of our product candidates;

•whether batches of product candidates that we manufacture fail to meet specifications resulting in clinical trial delays and investigational and remanufacturing costs;

•the decisions, and the timing of decisions, made by health regulatory agencies regarding our technology and product candidates;

•competing products, product candidates and technological and market developments; and

•costs associated with prosecuting and enforcing our patent claims and other intellectual property rights, including litigation and arbitration arising in the course of our business activities.

We intend to seek funding to maintain and advance our business from a variety of sources including public or private equity or debt financing, potential monetization transactions, collaborative or licensing arrangements with pharmaceutical companies and government grants and contracts. There can be no assurance that funding will be available at all or on acceptable terms to permit further advancement of our development programs.

If adequate funding is not available, we may be required to delay, reduce or eliminate one or more of our development programs or reduce expenses associated with our non-core activities. We may need to obtain funds through arrangements with collaborators or others that may require us to relinquish most or all of our rights to product candidates at an earlier stage of development or on less favorable terms than we would otherwise seek if we were better funded. Insufficient financing may also mean failing to prosecute our patents or relinquishing rights to some of our technologies that we would otherwise develop or commercialize.

OFF-BALANCE SHEET ARRANGEMENTS

We do not have any off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to investors.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information under this item is not required to be provided by smaller reporting companies.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2024. The term “disclosure controls and procedures”, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act), means controls and other procedures of a company that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure, particularly during the period in which this Quarterly Report on Form 10-Q was being prepared. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their desired objectives, and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of September 30, 2024, our principal executive officer and principal financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting (as defined in Rules 13a–15(f) and 15d–15(f) under the Exchange Act) during the three months ended September 30, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Patent Infringement Litigation vs. Pfizer and BioNTech

Patent Infringement Litigation vs. Moderna

Acuitas Declaratory Judgment Lawsuit

On March 18, 2022, Acuitas Therapeutics Inc. (Acuitas) filed a lawsuit against us and Genevant in the U.S. District Court for the Southern District of New York, asking the court to enter declaratory judgment that Arbutus patent Nos. 8,058,069, 8,492,359, 8,822,668, 9,006,417, 9,364,435, 9,404,127, 9,504,651, 9,518,272, and 11,141,378 do not infringe Pfizer and BioNTech’s COVID-19 vaccine, COMIRNATY, which uses an mRNA lipid provided, under license, by Acuitas. Acuitas also

seeks a declaration that each of the listed patents is invalid. On June 24, 2022, we and Genevant sought a pre-motion conference concerning our anticipated motion to dismiss all of Acuitas’ claims due to lack of subject matter jurisdiction. The request for a pre-motion conference was granted, but the case was subsequently re-assigned to a new judge who entered an order directing: (i) Acuitas to inform the court whether it intended to file an amended complaint; (ii) that Acuitas must file any amended complaint by a certain date; and (iii) that if Acuitas did not file an amended complaint, we and Genevant must file our motion to dismiss by a certain date. Acuitas filed its amended complaint on September 6, 2022. On October 4, 2022, we and Genevant filed our motion to dismiss the Acuitas action for lack of subject matter jurisdiction based on the lack of a case or controversy. Acuitas filed its opposition to the motion to dismiss on November 1, 2022, and we and Genevant filed our reply brief on November 16, 2022 at which point the motion was fully briefed. A status conference for the action was set for August 9, 2023, however on August 4, 2023, Acuitas voluntarily dismissed its complaint in the Southern District of New York and refiled a virtually identical complaint in the District Court of New Jersey (D. N.J.) where the Pfizer/BioNTech matter is currently pending, except that the 9,404,127 patent is not at issue in the New Jersey action, and Acuitas also added two additional patents to its New Jersey declaratory judgment action (U.S. Patent Nos. 11,298,320 and 11,318,098) that were not at issue in its New York action. On September 15, 2023, we and Genevant filed a letter with the court seeking a premotion conference for a motion to dismiss and subsequently filed our and Genevant’s motion to dismiss on October 13, 2023. Acuitas filed its opposition on November 1, 2023 and we and Genevant filed our reply on November 16, 2023. Acuitas filed a request to commence discovery on November 18, 2023, to which we and Genevant responded on November 20, 2023. On May 20, 2024, the court granted our and Genevant’s motion to dismiss, so we believe this matter is now concluded.

Moderna Inter Partes Review Petition

Moderna and Merck European Opposition

November 3, 2023, we responded to the summons and on January 15, 2024, Moderna and Merck filed their reply to the written opinion of the Opposition Division, as well as to our written submission of November 3, 2023. We responded to Moderna and Merck’s reply on April 5, 2024. Oral proceedings were held on June 6, 2024, and the Opposition Division upheld the ‘254 Patent but declined our and Genevant’s request to broaden certain claims in the ‘254 Patent. Both parties have given notice of their intent to appeal the Opposition Division’s decision, and the deadline for filing for their respective grounds for appeal is November 25, 2024.

Other Matters

We are also involved with various legal matters arising in the ordinary course of business. We make provisions for liabilities when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Such provisions are reviewed at least quarterly and adjusted to reflect the impact of any settlement negotiations, judicial and administrative rulings, advice of legal counsel, and other information and events pertaining to a particular case. Litigation is inherently unpredictable. Although the ultimate resolution of these various matters cannot be determined at this time, we do not believe that such matters, individually or in the aggregate, will have a material adverse effect on our consolidated results of operations, cash flows, or financial condition.

ITEM 1A. RISK FACTORS

There have been no material changes in our risk factors from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

Trading Plans

During the three months ended September 30, 2024, none of our directors or officers adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” as such terms are defined under Item 408 of Regulation S-K, except as follows:

•On September 18, 2024, the Irrevocable Deed of Trust of Michael J. Sofia dated July 6, 2020 (the Trust), adopted a “Rule 10b5-1 trading arrangement,” as defined in Item 408 of Regulation S-K, to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. Michael J. Sofia is our Chief Scientific Officer. This plan provides for the sale of an aggregate of up to 96,456 shares of our common stock, held by the Trust. This plan will terminate on April 15, 2025, or earlier upon the completed sale of the maximum number of common shares subject to the plan, subject to early termination for certain specified events set forth in the plan.

ITEM 6. EXHIBITS

EXHIBIT INDEX


Number						Description
3.1						Notice of Articles and Articles of the Company, as amended (incorporated herein by reference to Exhibit 3.1 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on March 16, 2018).

3.2						Amendment to Articles of the Company (incorporated herein by reference to Exhibit 3.1 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2018, filed with the SEC on November 7, 2018).

10.1#						First Amendment to Executive Employment Agreement, dated October 11, 2024, by and between Michael J. Sofia and Arbutus Biopharma, Inc. (incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K, filed with the SEC on October 11, 2024).

31.1*						Certification of Principal Executive Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2*						Certification of Principal Financial Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1**						Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2**						Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101						The following materials from Arbutus Biopharma Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2024, formatted in inline XBRL (eXtensible Business Reporting Language): (i) Condensed Consolidated Balance Sheets; (ii) Condensed Consolidated Statements of Operations; (iii) Condensed Consolidated Statements of Comprehensive Loss; (iv) Condensed Consolidated Statements of Stockholders’ Equity; (v) Condensed Consolidated Statements of Cash Flows; and (vi) Notes to Condensed Consolidated Financial Statements.

104						Cover page interactive data file (embedded within the inline XBRL document and included in Exhibit 101).

* Filed herewith.

** Furnished herewith.

# Management Contract or Compensatory Arrangement

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on November 6, 2024.


			ARBUTUS BIOPHARMA CORPORATION

			By:			/s/ Michael J. McElhaugh
						Michael J. McElhaugh
						Interim President and Chief Executive Officer
						(Principal Executive Officer)


			By:			/s/ David C. Hastings
						David C. Hastings
						Chief Financial Officer
						(Principal Financial Officer and Principal Accounting Officer)

Exhibit 31.1

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE SECURITIES

EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Michael J. McElhaugh, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Arbutus Biopharma Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 6, 2024


			/s/ Michael J. McElhaugh
			Name: Michael J. McElhaugh
			Title: Interim President and Chief Executive Officer

Exhibit 31.2

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF THE SECURITIES

EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, David Hastings, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Arbutus Biopharma Corporation;

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 6, 2024


			/s/ David Hastings
			Name: David Hastings
			Title: Chief Financial Officer

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Arbutus Biopharma Corporation (the “Company”) for the quarter ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael J. McElhaugh, Interim President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly represents, in all material respects, the financial condition and results of the operations of the Company.

Date: November 6, 2024


			/s/ Michael J. McElhaugh
			Name: Michael J. McElhaugh
			Title: Interim President and Chief Executive Officer

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Arbutus Biopharma Corporation (the “Company”) for the quarter ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, David Hastings, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly represents, in all material respects, the financial condition and results of the operations of the Company.

Date: November 6, 2024


			/s/ David Hastings
			Name: David Hastings
			Title: Chief Financial Officer

Cover - shares	9 Months Ended
Cover - shares	Sep. 30, 2024	Nov. 05, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-34949
Entity Registrant Name	ARBUTUS BIOPHARMA CORP
Entity Incorporation, State or Country Code	A1
Entity Tax Identification Number	98-0597776
Entity Address, Address Line One	701 Veterans Circle
Entity Address, City or Town	Warminster
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18974
City Area Code	267
Local Phone Number	469-0914
Title of 12(b) Security	Common Shares, without par value
Trading Symbol	ABUS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		189,491,685
Amendment Flag	false
Entity Central Index Key	0001447028
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 31,846	$ 26,285
Investments in marketable short-term securities	95,948	99,718
Accounts receivable	1,608	1,776
Prepaid expenses and other current assets	3,375	4,248
Total current assets	132,777	132,027
Property and equipment, net of accumulated depreciation of $12,663 (December 31, 2023: $11,900)	3,556	4,674
Investments in marketable securities, non-current	2,964	6,284
Right of use asset	1,144	1,416
Total assets	140,441	144,401
Current liabilities:
Accounts payable and accrued liabilities	7,544	10,271
Deferred license revenue, current	10,911	11,791
Lease liability, current	468	425
Total current liabilities	18,923	22,487
Liability related to sale of future royalties	5,315	6,953
Contingent consideration	8,335	7,600
Lease liability, non-current	978	1,343
Total liabilities	33,551	38,383
Stockholders’ equity
Issued and outstanding: 189,438,135 (December 31, 2023: 169,867,414)	1,407,595	1,349,821
Additional paid-in capital	81,425	81,270
Deficit	(1,334,040)	(1,276,652)
Accumulated other comprehensive loss	(48,090)	(48,421)
Total stockholders’ equity	106,890	106,018
Total liabilities and stockholders’ equity	$ 140,441	$ 144,401

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accumulated depreciation of property and equipment	$ 12,663	$ 11,900
Common shares, shares issued (in shares)	189,438,135	169,867,414
Common shares, shares outstanding (in shares)	189,438,135	169,867,414

Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue
Revenues	$ 1,339	$ 4,658	$ 4,597	$ 15,996
Operating expenses
Research and development	14,273	20,169	45,227	56,136
General and administrative	4,537	5,842	17,396	17,374
Change in fair value of contingent consideration	344	205	735	(158)
Restructuring charges	3,625	0	3,625	0
Total operating expenses	22,779	26,216	66,983	73,352
Loss from operations	(21,440)	(21,558)	(62,386)	(57,356)
Interest income	1,747	1,494	5,121	4,223
Interest expense	(29)	(46)	(107)	(415)
Foreign exchange gain/(loss)	5	6	(16)	11
Total other income	1,723	1,454	4,998	3,819
Net loss	$ (19,717)	$ (20,104)	$ (57,388)	$ (53,537)
Loss per share
Basic (in USD per share)	$ (0.10)	$ (0.12)	$ (0.31)	$ (0.32)
Diluted (in USD per share)	$ (0.10)	$ (0.12)	$ (0.31)	$ (0.32)
Weighted average number of common shares
Basic (in shares)	188,997,194	167,512,708	184,244,819	165,085,243
Diluted (in shares)	188,997,194	167,512,708
Comprehensive loss
Unrealized gain on available-for-sale securities	$ 218	$ 584	$ 331	$ 1,604
Comprehensive loss	(19,499)	(19,520)	(57,057)	(51,933)
Collaborations and licenses
Revenue
Revenues	767	3,935	2,861	13,329
Non-cash royalty revenue
Revenue
Revenues	$ 572	$ 723	$ 1,736	$ 2,667

Condensed Consolidated Statement of Stockholders’ Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-In Capital	Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2022		157,455,363
Beginning balance at Dec. 31, 2022	$ 136,852	$ 1,318,737	$ 72,406	$ (1,203,803)	$ (50,488)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,131		2,131
Issuance of common shares pursuant to the Open Market Sale Agreement (in shares)		7,423,622
Issuance of common shares pursuant to the Open Market Sale Agreement	19,862	$ 19,862
Issuance of common shares pursuant to exercise of options (in shares)		101,356
Issuance of common shares pursuant to ESPP	259	$ 457	(198)
Issuance of common shares pursuant to ESPP (in shares)		151,852
Issuance of common shares pursuant to ESPP	296	$ 397	(101)
Unrealized gain on available-for-sale securities	854				854
Net loss	(16,339)			(16,339)
Ending balance (in shares) at Mar. 31, 2023		165,132,193
Ending balance at Mar. 31, 2023	143,915	$ 1,339,453	74,238	(1,220,142)	(49,634)
Beginning balance (in shares) at Dec. 31, 2022		157,455,363
Beginning balance at Dec. 31, 2022	136,852	$ 1,318,737	72,406	(1,203,803)	(50,488)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(53,537)
Ending balance (in shares) at Sep. 30, 2023		167,695,247
Ending balance at Sep. 30, 2023	119,337	$ 1,346,015	79,546	(1,257,340)	(48,884)
Beginning balance (in shares) at Mar. 31, 2023		165,132,193
Beginning balance at Mar. 31, 2023	143,915	$ 1,339,453	74,238	(1,220,142)	(49,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,964		2,964
Issuance of common shares pursuant to the Open Market Sale Agreement (in shares)		1,790,546
Issuance of common shares pursuant to the Open Market Sale Agreement	4,742	$ 4,742
Unrealized gain on available-for-sale securities	166				166
Net loss	(17,094)			(17,094)
Ending balance (in shares) at Jun. 30, 2023		166,922,739
Ending balance at Jun. 30, 2023	134,693	$ 1,344,195	77,202	(1,237,236)	(49,468)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,483		2,483
Issuance of common shares pursuant to the Open Market Sale Agreement (in shares)		633,922
Issuance of common shares pursuant to the Open Market Sale Agreement	1,396	$ 1,396
Issuance of common shares pursuant to ESPP (in shares)		138,586
Issuance of common shares pursuant to ESPP	285	$ 424	(139)
Unrealized gain on available-for-sale securities	584				584
Net loss	(20,104)			(20,104)
Ending balance (in shares) at Sep. 30, 2023		167,695,247
Ending balance at Sep. 30, 2023	$ 119,337	$ 1,346,015	79,546	(1,257,340)	(48,884)
Beginning balance (in shares) at Dec. 31, 2023	169,867,414	169,867,414
Beginning balance at Dec. 31, 2023	$ 106,018	$ 1,349,821	81,270	(1,276,652)	(48,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,014		2,014
Issuance of common shares pursuant to the Open Market Sale Agreement (in shares)		8,666,077
Issuance of common shares pursuant to the Open Market Sale Agreement	21,765	$ 21,765
Issuance of common shares pursuant to exercise of options (in shares)		1,126,691
Issuance of common shares pursuant to ESPP	2,454	$ 4,268	(1,814)
Issuance of common shares pursuant to ESPP (in shares)		121,563
Issuance of common shares pursuant to ESPP	211	$ 271	(60)
Unrealized gain on available-for-sale securities	50				50
Net loss	(17,875)			(17,875)
Issuance of common shares upon vesting of RSUs		410,482
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 1,190	(1,190)
Ending balance (in shares) at Mar. 31, 2024		180,192,227
Ending balance at Mar. 31, 2024	$ 114,637	$ 1,377,315	80,220	(1,294,527)	(48,371)
Beginning balance (in shares) at Dec. 31, 2023	169,867,414	169,867,414
Beginning balance at Dec. 31, 2023	$ 106,018	$ 1,349,821	81,270	(1,276,652)	(48,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (57,388)
Ending balance (in shares) at Sep. 30, 2024	189,438,135	189,438,135
Ending balance at Sep. 30, 2024	$ 106,890	$ 1,407,595	81,425	(1,334,040)	(48,090)
Beginning balance (in shares) at Mar. 31, 2024		180,192,227
Beginning balance at Mar. 31, 2024	114,637	$ 1,377,315	80,220	(1,294,527)	(48,371)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	3,180		3,180
Issuance of common shares pursuant to the Open Market Sale Agreement (in shares)		7,833,922
Issuance of common shares pursuant to the Open Market Sale Agreement	22,359	$ 22,359
Issuance of common shares pursuant to exercise of options (in shares)		712,895
Issuance of common shares pursuant to ESPP	2,011	$ 3,660	(1,649)
Unrealized gain on available-for-sale securities	63				63
Net loss	(19,796)			(19,796)
Ending balance (in shares) at Jun. 30, 2024		188,739,044
Ending balance at Jun. 30, 2024	122,454	$ 1,403,334	81,751	(1,314,323)	(48,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,160		2,160
Issuance of common shares pursuant to exercise of options (in shares)		593,321
Issuance of common shares pursuant to ESPP	1,590	$ 3,996	(2,406)
Issuance of common shares pursuant to ESPP (in shares)		105,770
Issuance of common shares pursuant to ESPP	185	$ 265	(80)
Unrealized gain on available-for-sale securities	218				218
Net loss	$ (19,717)			(19,717)
Ending balance (in shares) at Sep. 30, 2024	189,438,135	189,438,135
Ending balance at Sep. 30, 2024	$ 106,890	$ 1,407,595	$ 81,425	$ (1,334,040)	$ (48,090)

Condensed Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES
Net loss	$ (57,388)	$ (53,537)
Non-cash items:
Depreciation	1,047	1,045
Loss on impairment of lab equipment	167	0
Gain on sale of property and equipment	0	20
Stock-based compensation expense	7,354	7,578
Change in fair value of contingent consideration	735	(158)
Non-cash royalty revenue	(1,736)	(2,667)
Non-cash interest expense	98	412
Net accretion and amortization of investments in marketable securities	(2,212)	(1,577)
Net change in operating items:
Accounts receivable	168	(819)
Prepaid expenses and other assets	1,145	(2,040)
Accounts payable and accrued liabilities	(2,727)	(6,223)
Change in deferred license revenue	(880)	(10,349)
Other liabilities	(306)	(289)
Net cash used in operating activities	(54,535)	(68,644)
INVESTING ACTIVITIES
Purchase of investments in marketable securities	(98,318)	(56,490)
Proceeds from Sale of Property, Plant, and Equipment	0	20
Disposition of investments in marketable securities	107,951	86,026
Acquisition of property and equipment	(96)	(1,008)
Net cash provided by investing activities	9,537	28,548
FINANCING ACTIVITIES
Issuance of common shares pursuant to the Open Market Sale Agreement	44,124	26,000
Issuance of common shares pursuant to exercise of stock options	6,055	259
Issuance of common shares pursuant to ESPP	396	581
Net cash provided by financing activities	50,575	26,840
Effect of foreign exchange rate changes on cash and cash equivalents	(16)	11
Increase/(decrease) in cash and cash equivalents	5,561	(13,245)
Cash and cash equivalents, beginning of period	26,285	30,776
Cash and cash equivalents, end of period	$ 31,846	$ 17,531

Nature of business and future operations	9 Months Ended
Nature of business and future operations	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of business and future operations	Nature of business and future operations Description of the Business Arbutus Biopharma Corporation (“Arbutus” or “the Company”) is a clinical-stage biopharmaceutical company leveraging its extensive virology expertise to develop novel therapeutics with distinct mechanisms of action, which can potentially be combined to provide a functional cure for patients with chronic hepatitis B virus (cHBV) infection. The Company believes the key to success in developing a functional cure involves suppressing hepatitis B virus deoxyribonucleic acid, reducing hepatitis B surface antigen and boosting HBV-specific immune responses. The Company’s pipeline of internally developed, proprietary compounds includes an RNAi therapeutic, imdusiran (AB-729), and an oral PD-L1 inhibitor, AB-101. Imdusiran has generated meaningful clinical data demonstrating an impact on both surface antigen reduction and reawakening of the HBV-specific immune response. Imdusiran is currently in two Phase 2a combination clinical trials. AB-101 is currently being evaluated in a Phase 1a/1b clinical trial. The Company continues to protect and defend its intellectual property, which is the subject of the Company’s ongoing lawsuits against Moderna Therapeutics, Inc. (Moderna) and Pfizer Inc. and BioNTech SE (collectively, Pfizer/BioNTech) for their use of the Company’s patented lipid nanoparticle (LNP) technology in their COVID-19 vaccines. With respect to the Moderna lawsuit, the claim construction hearing occurred on February 8, 2024. On April 3, 2024, the court provided its claim construction ruling in which it construed the disputed claim terms and agreed with the Company’s position on most of the disputed claim terms. On August 5, 2024, the Company and Genevant Sciences Ltd. (Genevant), along with Moderna, filed a Stipulation to Extend Time with the court that requested an amended case schedule to accommodate certain outstanding discovery from Moderna and third parties. The court approved the amended case schedule and the start of the trial was moved from April 21, 2025 to September 24, 2025, subject to the court’s availability. The lawsuit against Pfizer/BioNTech is ongoing and a date for a claim construction hearing has been scheduled for December 18, 2024. Liquidity At September 30, 2024, the Company had an aggregate of $130.8 million in cash, cash equivalents and investments in marketable securities. The Company had no outstanding debt as of September 30, 2024. The Company believes it has sufficient cash resources to fund its operations for at least the next 12 months. The success of the Company is dependent on obtaining the necessary regulatory approvals to bring its products to market and achieve profitable operations. The Company’s research and development activities and the commercialization of its products are dependent on its ability to successfully complete these activities and to obtain adequate financing through a combination of financing activities and operations. It is not possible to predict either the outcome of the Company’s existing or future research and development programs or the Company’s ability to continue to fund these programs in the future.

Significant accounting policies	9 Months Ended
Significant accounting policies	Sep. 30, 2024
Accounting Policies [Abstract]
Significant accounting policies	Significant accounting policies Basis of presentation and principles of consolidation These unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles for interim financial statements and accordingly, do not include all disclosures required for annual financial statements. These statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. These unaudited condensed consolidated financial statements include the accounts of Arbutus Biopharma Corporation and its one wholly-owned subsidiary, Arbutus Biopharma, Inc., and reflect, in the opinion of management, all adjustments and reclassifications necessary to fairly present the Company’s financial position as of September 30, 2024 and December 31, 2023, the Company’s results of operations for the three and nine months ended September 30, 2024 and 2023, and the Company’s cash flows for the nine months ended September 30, 2024 and 2023. Such adjustments are of a normal recurring nature. The results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results for the full year. These unaudited condensed consolidated financial statements follow the same significant accounting policies as those described in the notes to the audited consolidated financial statements of the Company for the year ended December 31, 2023, except as described below under the section entitled “Recent Accounting Pronouncements.” All intercompany balances and transactions have been eliminated. Net loss per share Net loss per share is calculated based on the weighted average number of common shares outstanding. Diluted net loss per share does not differ from basic net loss per share for the three and nine months ended September 30, 2024 and 2023, since the effect of including potential common shares would be anti-dilutive. For the nine months ended September 30, 2024, potential common shares of 18.7 million pertaining to outstanding stock options and unvested restricted stock units were excluded from the calculation of net loss per share. A total of approximately 21.0 million outstanding stock options were excluded from the calculation for the nine months ended September 30, 2023. Revenue from collaborations and licenses The Company generates revenue through certain collaboration agreements and license agreements. Such agreements may require the Company to deliver various rights and/or services, including intellectual property rights or licenses and research and development services. Under such agreements, the Company is generally eligible to receive non-refundable upfront payments, funding for research and development services, milestone payments and royalties. The Company’s collaboration agreements fall under the scope of Accounting Standards Codification (ASC) Topic 808, Collaborative Arrangements (ASC 808), when both parties are active participants in the arrangement and are exposed to significant risks and rewards. For certain arrangements under the scope of ASC 808, the Company analogizes to ASC Topic 606, Revenue from Contracts with Customers (ASC 606), for some aspects, including for the delivery of a good or service (i.e., a unit of account). ASC 606 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers under a five-step model: (i) identify contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when or as a performance obligation is satisfied. In contracts where the Company has more than one performance obligation to provide its customer with goods or services, each performance obligation is evaluated to determine whether it is distinct based on whether (i) the customer can benefit from the good or service either on its own or together with other resources that are readily available and (ii) the good or service is separately identifiable from other promises in the contract. The consideration under the contract is then allocated between the distinct performance obligations based on their respective relative stand-alone selling prices. The estimated stand-alone selling price of each deliverable reflects the Company’s best estimate of what the selling price would be if the deliverable was regularly sold on a stand-alone basis and is determined by reference to market rates for the good or service when sold to others or by using an adjusted market assessment approach if the selling price on a stand-alone basis is not available. The consideration allocated to each distinct performance obligation is recognized as revenue when control is transferred to the customer for the related goods or services. Consideration associated with at-risk substantive performance milestones, including sales-based milestones, is recognized as revenue when it is probable that a significant reversal of the cumulative revenue recognized will not occur. Sales-based royalties received in connection with licenses of intellectual property are subject to a specific exception in the revenue standards, whereby the consideration is not included in the transaction price and recognized in revenue until the customer’s subsequent sales or usages occur. Deferred Revenue When consideration is received or is unconditionally due from a customer, collaborator or licensee prior to the Company completing its performance obligation to the customer, collaborator or licensee under the terms of a contract, deferred revenue is recorded. Deferred revenue expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a current liability. Deferred revenue not expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a long-term liability. In accordance with ASC Topic 210-20, Balance Sheet - Offsetting (ASC 210-20) the Company’s deferred revenue is offset by a contract asset as further discussed in Note 9. Segment information The Company operates as a single segment. Recent accounting pronouncements In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07), which requires disclosure of significant segment expenses and other segment items on an annual and interim basis under ASC 280. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. Early adoption is permitted and the amendments in this ASU should be applied on a retrospective basis to all periods presented. The Company has not yet determined the impact ASU 2023-07 may have on the Company’s financial statement disclosures. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU 2023-09), which improves income tax disclosures by requiring: (1) consistent categories and greater disaggregation of information in the rate reconciliation, and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The ASU indicates that all entities will apply the guidance prospectively with an option for retroactive application to each period presented in the financial statements. The Company has not yet determined the impact ASU 2023-09 may have on the Company’s financial statement disclosures. The Company has reviewed all other recently issued standards and has determined that such standards will not have a material impact on the Company’s financial statements or do not otherwise apply to the Company’s operations.

Fair value measurements

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Fair value measurements

The Company measures certain financial instruments and other items at fair value.

•Level 1 inputs are quoted market prices for identical instruments available in active markets.

•Level 3 inputs are unobservable inputs for the asset or liability and will reflect management’s assumptions about market assumptions that would be used to price the asset or liability.


	Level 1		Level 2		Level 3		Total
As of September 30, 2024	(in thousands)
Assets
Cash and cash equivalents	$	31,846	$	—	$	—	$	31,846
Investments in marketable securities, current	—		95,948		—		95,948
Investments in marketable securities, non-current	—		2,964		—		2,964
Total	$	31,846	$	98,912	$	—	$	130,758
Liabilities
Contingent consideration	—		—		8,335		8,335
Total	$	—	$	—	$	8,335	$	8,335


	Level 1		Level 2		Level 3		Total
As of December 31, 2023	(in thousands)
Assets
Cash and cash equivalents	$	26,285	$	—	$	—	$	26,285
Investments in marketable securities, current	—		99,718		—		99,718
Investments in marketable securities, non-current	—		6,284		—		6,284
Total	$	26,285	$	106,002	$	—	$	132,287
Liabilities
Contingent consideration	—		—		7,600		7,600
Total	$	—	$	—	$	7,600	$	7,600

The following table presents the changes in fair value of the Company’s contingent consideration:


	Liability at beginning of the period		Change in fair value of liability		Liability at end of the period
	(in thousands)
Nine Months Ended September 30, 2024	$	7,600	$	735	$	8,335
Nine Months Ended September 30, 2023	$	7,531	$	(158)	$	7,373

See Note 4 for additional information regarding the fair value of the Company’s investments in marketable securities.

Investments in marketable securities

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Investments in marketable securities

Investments in marketable securities consisted of the following:


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of September 30, 2024	(in thousands)
Cash equivalents
Money market	$	25,948	$	—	$	—	$	25,948

Total	$	25,948	$	—	$	—	$	25,948
Investments in marketable short-term securities

US corporate bonds	43,477		23		(9)		43,491
US treasury bills	52,408		49		—		52,457


Total	$	95,885	$	72	$	(9)	$	95,948
Investments in marketable long-term securities

US corporate bonds	2,932		32		—		2,964


Total	$	2,932	$	32	$	—	$	2,964

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of December 31, 2023	(in thousands)
Cash equivalents
Money market fund	$	18,029	$	—	$	—	$	18,029
Total	$	18,029	$	—	$	—	$	18,029
Investments in marketable short-term securities
US government agency bonds	$	17,918	$	—	$	(44)	$	17,874
US corporate bonds	71,045		30		(189)		70,886
Yankee bonds	2,000		—		(17)		1,983
US government bonds	$	9,001	$	—	$	(26)	$	8,975
Total	$	99,964	$	30	$	(276)	$	99,718
Investments in marketable long-term securities

US corporate bonds	6,273		18		(7)		6,284


Total	$	6,273	$	18	$	(7)	$	6,284

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.

Accrued interest receivable on investments in marketable securities of $0.3 million at both September 30, 2024 and December 31, 2023 is included in prepaid expenses and other current assets.

See Note 3 for additional information regarding the fair value of the Company’s investments in marketable securities.

Investment in Genevant	9 Months Ended
Investment in Genevant	Sep. 30, 2024
Equity Method Investments and Joint Ventures [Abstract]
Investment in Genevant	Investment in Genevant In April 2018, the Company entered into an agreement with Roivant Sciences Ltd. (Roivant), its largest shareholder, to launch Genevant, a company focused on a broad range of RNA-based therapeutics enabled by the Company’s LNP and ligand conjugate delivery technologies. The Company licensed rights to its LNP and ligand conjugate delivery platforms to Genevant for RNA-based applications outside of HBV, except to the extent certain rights had already been licensed to other third parties (the Genevant License). The Company retained all rights to its LNP and conjugate delivery platforms for HBV. Under the Genevant License, as amended, if a third party sublicensee of intellectual property licensed by Genevant from the Company commercializes a sublicensed product, the Company becomes entitled to receive a specified percentage of certain revenue that may be received by Genevant for such sublicense, including royalties, commercial milestones and other sales-related revenue, or, if less, tiered low single-digit royalties on net sales of the sublicensed product. The specified percentage is 20% in the case of a mere sublicense (i.e., naked sublicense) by Genevant without additional contribution and 14% in the case of a bona fide collaboration with Genevant. Additionally, if Genevant receives proceeds from an action for infringement by any third parties of the Company’s intellectual property licensed to Genevant, the Company would be entitled to receive, after deduction of litigation costs, 20% of the proceeds received by Genevant or, if less, tiered low single-digit royalties on net sales of the infringing product (inclusive of the proceeds from litigation or settlement, which would be treated as net sales). The Company accounts for its interest in Genevant as equity securities without readily determinable fair values. Accordingly, an estimate of the fair value of the securities is based on the original cost less previously recognized equity method losses, less impairments, plus or minus changes resulting from observable price changes in orderly transactions for identical or a similar Genevant securities. As of September 30, 2024, the carrying value of the Company’s investment in Genevant was zero and the Company owned approximately 16% of the common equity of Genevant.

Accounts payable and accrued liabilities

9 Months Ended

Sep. 30, 2024

Payables and Accruals [Abstract]

Accounts payable and accrued liabilities

Accounts payable and accrued liabilities are comprised of the following:


	September 30, 2024		December 31, 2023
	(in thousands)
Trade accounts payable	$	2,315	$	3,223
Research and development accruals	1,367		2,884
Professional fee accruals	709		815
Payroll accruals	2,588		3,349
Restructuring liabilities	565		—
Total accounts payable and accrued liabilities	$	7,544	$	10,271

Sale of future royalties

9 Months Ended

Sep. 30, 2024

Other Liabilities Disclosure [Abstract]

Sale of future royalties

The table below shows the activity related to the net liability for the nine months ended September 30, 2024 and 2023:


	Nine Months Ended September 30,
	2024		2023
	(in thousands)
Net liability related to sale of future royalties - beginning balance	$	6,953	$	10,365
Non-cash royalty revenue	(1,736)		(2,667)
Non-cash interest expense	98		412
Net liability related to sale of future royalties - ending balance	$	5,315	$	8,110

Contingencies and commitments	9 Months Ended
Contingencies and commitments	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingencies and commitments	Contingencies and commitments Stock Purchase Agreement with Enantigen In October 2014, Arbutus Inc., the Company’s wholly-owned subsidiary, acquired all of the outstanding shares of Enantigen Therapeutics, Inc. (Enantigen) pursuant to a stock purchase agreement. The amount paid to Enantigen’s selling shareholders could be up to an additional $102.5 million in sales performance milestones in connection with the sale of the first commercialized product by the Company for the treatment of HBV, regardless of whether such product is based upon assets acquired under this agreement, and a low single-digit royalty on net sales of such first commercialized HBV product, up to a maximum royalty payment of $1.0 million that, if paid, would be offset against the Company’s milestone payment obligations. Certain other development milestones related to the acquisition were tied to programs which are no longer under development by the Company, and therefore the contingency related to those development milestones is zero. The contingent consideration is a financial liability and is measured at its fair value at each reporting period, with any changes in fair value from the previous reporting period recorded in the statements of operations and comprehensive loss (see Note 3). The fair value of the contingent consideration was $8.3 million as of September 30, 2024.

Collaborations, contracts and licensing agreements

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

Collaborations, contracts and licensing agreements

Collaborations

Qilu Pharmaceutical Co., Ltd.

The following table outlines the transaction price and the changes to the related liability balance:


	Transaction Price		Cumulative Collaboration Revenue Recognized		Deferred License Revenue
	(in thousands)
Combined performance obligation	$	50,445	$	37,561	$	12,884
Less contract asset					(1,973)
Total deferred license revenue					10,911

Barinthus Biotherapeutics plc

Royalty Entitlements

Alnylam Pharmaceuticals, Inc. and Acuitas Therapeutics, Inc.

The Company has two royalty entitlements to Alnylam’s global net sales of ONPATTRO.

Revenues are summarized in the following table:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands)				(in thousands)
Revenue from collaborations and licenses
Acuitas Therapeutics, Inc.	$	644	$	714	$	1,981	$	2,980
Qilu Pharmaceutical Co., Ltd.	123		3,221		880		10,349

Non-cash royalty revenue
Alnylam Pharmaceuticals, Inc.	572		723		1,736		2,667
Total revenue	$	1,339	$	4,658	$	4,597	$	15,996

Shareholders’ equity

9 Months Ended

Sep. 30, 2024

Stockholders' Equity Note [Abstract]

Shareholders’ equity

Authorized share capital

Open Market Sale Agreement

Stock-based compensation


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)
Stock options
Options granted during period	—		784,240		4,163,000		5,082,640
Weighted average exercise price	$	—	$	2.25	$	2.49	$	2.78
Restricted stock units (RSUs)
Restricted stock units granted during period	—		—		1,316,200		1,344,550
Grant date fair value	$	—	$	—	$	2.40	$	2.90
Stock compensation expense
Research and development	$	847	$	1,002	$	3,007	$	2,854
General and administrative	1,313		1,481		4,347		4,724
Total stock compensation expense	$	2,160	$	2,483	$	7,354	$	7,578

Restructuring	9 Months Ended
Restructuring	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
Restructuring, Impairment, and Other Activities Disclosure	Restructuring On July 29, 2024, the Company’s Board of Directors approved a plan, effective August 1, 2024, to streamline the organization to focus its efforts on advancing the clinical development of imdusiran and AB-101, and therefore ceased all discovery efforts and discontinued its IM-PROVE III clinical trial. In taking these steps to streamline the organization, the Company implemented a 40% reduction in its workforce, primarily affecting the discovery and general and administrative functions. As a result, the Company incurred a one-time restructuring charge in the third quarter of 2024 of $3.6 million, which includes approximately $2.9 million of cash severance and continued benefits paid, a non-cash impairment charge for laboratory equipment of $0.2 million and $0.5 million of cash payments to vendors for close-out activities in connection with the cessation of discovery efforts and the discontinuation of the IM-PROVE III clinical trial. As of September 30, 2024, there were $0.6 million of accrued restructuring costs for contract close-out activities and severance payments included in accounts payable and accrued liabilities.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net loss	$ (19,717)	$ (19,796)	$ (17,875)	$ (20,104)	$ (17,094)	$ (16,339)	$ (57,388)	$ (53,537)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Michael J. Sofia [Member]
Trading Arrangements, by Individual
Name	Michael J. Sofia
Irrevocable Deed of Trust of Michael J. Sofia [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On September 18, 2024, the Irrevocable Deed of Trust of Michael J. Sofia dated July 6, 2020 (the Trust), adopted a “Rule 10b5-1 trading arrangement,” as defined in Item 408 of Regulation S-K, to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. Michael J. Sofia is our Chief Scientific Officer. This plan provides for the sale of an aggregate of up to 96,456 shares of our common stock, held by the Trust. This plan will terminate on April 15, 2025, or earlier upon the completed sale of the maximum number of common shares subject to the plan, subject to early termination for certain specified events set forth in the plan.
Irrevocable Deed of Trust of Michael J. Sofia [Member] \| Michael J. Sofia [Member]
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 18, 2024
Expiration Date	April 15, 2025
Aggregate Available	96,456

Significant accounting policies (Policies)	9 Months Ended
Significant accounting policies (Policies)	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation and principles of consolidation These unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles for interim financial statements and accordingly, do not include all disclosures required for annual financial statements. These statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. These unaudited condensed consolidated financial statements include the accounts of Arbutus Biopharma Corporation and its one wholly-owned subsidiary, Arbutus Biopharma, Inc., and reflect, in the opinion of management, all adjustments and reclassifications necessary to fairly present the Company’s financial position as of September 30, 2024 and December 31, 2023, the Company’s results of operations for the three and nine months ended September 30, 2024 and 2023, and the Company’s cash flows for the nine months ended September 30, 2024 and 2023. Such adjustments are of a normal recurring nature. The results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results for the full year. These unaudited condensed consolidated financial statements follow the same significant accounting policies as those described in the notes to the audited consolidated financial statements of the Company for the year ended December 31, 2023, except as described below under the section entitled “Recent Accounting Pronouncements.”
Principles of consolidation	All intercompany balances and transactions have been eliminated.
Net loss attributable to common shareholders per share	Net loss per share Net loss per share is calculated based on the weighted average number of common shares outstanding. Diluted net loss per share does not differ from basic net loss per share for the three and nine months ended September 30, 2024 and 2023, since the effect of including potential common shares would be anti-dilutive. For the nine months ended September 30, 2024, potential common shares of 18.7 million pertaining to outstanding stock options and unvested restricted stock units were excluded from the calculation of net loss per share. A total of approximately 21.0 million outstanding stock options were excluded from the calculation for the nine months ended September 30, 2023.
Revenue from collaborations and licenses and Deferred Revenue	Revenue from collaborations and licenses The Company generates revenue through certain collaboration agreements and license agreements. Such agreements may require the Company to deliver various rights and/or services, including intellectual property rights or licenses and research and development services. Under such agreements, the Company is generally eligible to receive non-refundable upfront payments, funding for research and development services, milestone payments and royalties. The Company’s collaboration agreements fall under the scope of Accounting Standards Codification (ASC) Topic 808, Collaborative Arrangements (ASC 808), when both parties are active participants in the arrangement and are exposed to significant risks and rewards. For certain arrangements under the scope of ASC 808, the Company analogizes to ASC Topic 606, Revenue from Contracts with Customers (ASC 606), for some aspects, including for the delivery of a good or service (i.e., a unit of account). ASC 606 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers under a five-step model: (i) identify contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when or as a performance obligation is satisfied. In contracts where the Company has more than one performance obligation to provide its customer with goods or services, each performance obligation is evaluated to determine whether it is distinct based on whether (i) the customer can benefit from the good or service either on its own or together with other resources that are readily available and (ii) the good or service is separately identifiable from other promises in the contract. The consideration under the contract is then allocated between the distinct performance obligations based on their respective relative stand-alone selling prices. The estimated stand-alone selling price of each deliverable reflects the Company’s best estimate of what the selling price would be if the deliverable was regularly sold on a stand-alone basis and is determined by reference to market rates for the good or service when sold to others or by using an adjusted market assessment approach if the selling price on a stand-alone basis is not available. The consideration allocated to each distinct performance obligation is recognized as revenue when control is transferred to the customer for the related goods or services. Consideration associated with at-risk substantive performance milestones, including sales-based milestones, is recognized as revenue when it is probable that a significant reversal of the cumulative revenue recognized will not occur. Sales-based royalties received in connection with licenses of intellectual property are subject to a specific exception in the revenue standards, whereby the consideration is not included in the transaction price and recognized in revenue until the customer’s subsequent sales or usages occur. Deferred Revenue When consideration is received or is unconditionally due from a customer, collaborator or licensee prior to the Company completing its performance obligation to the customer, collaborator or licensee under the terms of a contract, deferred revenue is recorded. Deferred revenue expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a current liability. Deferred revenue not expected to be recognized as revenue within the 12 months following the balance sheet date is classified as a long-term liability. In accordance with ASC Topic 210-20, Balance Sheet - Offsetting (ASC 210-20) the Company’s deferred revenue is offset by a contract asset as further discussed in Note 9.
Segment information	Segment information The Company operates as a single segment.
Recent accounting pronouncements	Recent accounting pronouncements In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07), which requires disclosure of significant segment expenses and other segment items on an annual and interim basis under ASC 280. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. Early adoption is permitted and the amendments in this ASU should be applied on a retrospective basis to all periods presented. The Company has not yet determined the impact ASU 2023-07 may have on the Company’s financial statement disclosures. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU 2023-09), which improves income tax disclosures by requiring: (1) consistent categories and greater disaggregation of information in the rate reconciliation, and (2) income taxes paid disaggregated by jurisdiction. It also includes certain other amendments to improve the effectiveness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The ASU indicates that all entities will apply the guidance prospectively with an option for retroactive application to each period presented in the financial statements. The Company has not yet determined the impact ASU 2023-09 may have on the Company’s financial statement disclosures. The Company has reviewed all other recently issued standards and has determined that such standards will not have a material impact on the Company’s financial statements or do not otherwise apply to the Company’s operations.
Fair value measurements	Fair value measurements The Company measures certain financial instruments and other items at fair value. To determine the fair value, the Company uses the fair value hierarchy for inputs used in measuring fair value that maximize the use of observable inputs and minimize the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use to value an asset or liability and are developed based on market data obtained from independent sources. Unobservable inputs are inputs based on assumptions about the factors market participants would use to value an asset or liability. The three levels of inputs that may be used to measure fair value are as follows: •Level 1 inputs are quoted market prices for identical instruments available in active markets. •Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability either directly or indirectly. If the asset or liability has a contractual term, the input must be observable for substantially the full term. An example includes quoted market prices for similar assets or liabilities in active markets. •Level 3 inputs are unobservable inputs for the asset or liability and will reflect management’s assumptions about market assumptions that would be used to price the asset or liability. Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the immediate or short-term maturity of these financial instruments. To determine the fair value of the contingent consideration (Note 8), the Company uses a probability weighted assessment of the likelihood the milestones would be met and the estimated timing of such payments, and then the potential contingent payments are discounted to their present value using a probability adjusted discount rate that reflects the early stage nature of the development program, the time to complete the program development, and overall biotech indices.

Fair Value Measures and Disclosures (Policies)	9 Months Ended
Fair Value Measures and Disclosures (Policies)	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements The Company measures certain financial instruments and other items at fair value. To determine the fair value, the Company uses the fair value hierarchy for inputs used in measuring fair value that maximize the use of observable inputs and minimize the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use to value an asset or liability and are developed based on market data obtained from independent sources. Unobservable inputs are inputs based on assumptions about the factors market participants would use to value an asset or liability. The three levels of inputs that may be used to measure fair value are as follows: •Level 1 inputs are quoted market prices for identical instruments available in active markets. •Level 2 inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability either directly or indirectly. If the asset or liability has a contractual term, the input must be observable for substantially the full term. An example includes quoted market prices for similar assets or liabilities in active markets. •Level 3 inputs are unobservable inputs for the asset or liability and will reflect management’s assumptions about market assumptions that would be used to price the asset or liability. Assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurements. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the immediate or short-term maturity of these financial instruments. To determine the fair value of the contingent consideration (Note 8), the Company uses a probability weighted assessment of the likelihood the milestones would be met and the estimated timing of such payments, and then the potential contingent payments are discounted to their present value using a probability adjusted discount rate that reflects the early stage nature of the development program, the time to complete the program development, and overall biotech indices.

Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2024

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis


	Level 1		Level 2		Level 3		Total
As of September 30, 2024	(in thousands)
Assets
Cash and cash equivalents	$	31,846	$	—	$	—	$	31,846
Investments in marketable securities, current	—		95,948		—		95,948
Investments in marketable securities, non-current	—		2,964		—		2,964
Total	$	31,846	$	98,912	$	—	$	130,758
Liabilities
Contingent consideration	—		—		8,335		8,335
Total	$	—	$	—	$	8,335	$	8,335


	Level 1		Level 2		Level 3		Total
As of December 31, 2023	(in thousands)
Assets
Cash and cash equivalents	$	26,285	$	—	$	—	$	26,285
Investments in marketable securities, current	—		99,718		—		99,718
Investments in marketable securities, non-current	—		6,284		—		6,284
Total	$	26,285	$	106,002	$	—	$	132,287
Liabilities
Contingent consideration	—		—		7,600		7,600
Total	$	—	$	—	$	7,600	$	7,600

Schedule of changes in fair value of contingent consideration

The following table presents the changes in fair value of the Company’s contingent consideration:


	Liability at beginning of the period		Change in fair value of liability		Liability at end of the period
	(in thousands)
Nine Months Ended September 30, 2024	$	7,600	$	735	$	8,335
Nine Months Ended September 30, 2023	$	7,531	$	(158)	$	7,373

Investments in marketable securities (Tables)

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Marketable securities

Investments in marketable securities consisted of the following:


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of September 30, 2024	(in thousands)
Cash equivalents
Money market	$	25,948	$	—	$	—	$	25,948

Total	$	25,948	$	—	$	—	$	25,948
Investments in marketable short-term securities

US corporate bonds	43,477		23		(9)		43,491
US treasury bills	52,408		49		—		52,457


Total	$	95,885	$	72	$	(9)	$	95,948
Investments in marketable long-term securities

US corporate bonds	2,932		32		—		2,964


Total	$	2,932	$	32	$	—	$	2,964

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.


	Amortized Cost		Gross Unrealized Gain(1)		Gross Unrealized Loss(1)		Fair Value
As of December 31, 2023	(in thousands)
Cash equivalents
Money market fund	$	18,029	$	—	$	—	$	18,029
Total	$	18,029	$	—	$	—	$	18,029
Investments in marketable short-term securities
US government agency bonds	$	17,918	$	—	$	(44)	$	17,874
US corporate bonds	71,045		30		(189)		70,886
Yankee bonds	2,000		—		(17)		1,983
US government bonds	$	9,001	$	—	$	(26)	$	8,975
Total	$	99,964	$	30	$	(276)	$	99,718
Investments in marketable long-term securities

US corporate bonds	6,273		18		(7)		6,284


Total	$	6,273	$	18	$	(7)	$	6,284

(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.

Accounts payable and accrued liabilities (Tables)

9 Months Ended

Sep. 30, 2024

Payables and Accruals [Abstract]

Schedule of accounts payable and accrued liabilities

Accounts payable and accrued liabilities are comprised of the following:


	September 30, 2024		December 31, 2023
	(in thousands)
Trade accounts payable	$	2,315	$	3,223
Research and development accruals	1,367		2,884
Professional fee accruals	709		815
Payroll accruals	2,588		3,349
Restructuring liabilities	565		—
Total accounts payable and accrued liabilities	$	7,544	$	10,271

Sale of future royalties (Tables)

9 Months Ended

Sep. 30, 2024

Other Liabilities Disclosure [Abstract]

Schedule of activity related to the net liability from inception of the Agreement

The table below shows the activity related to the net liability for the nine months ended September 30, 2024 and 2023:


	Nine Months Ended September 30,
	2024		2023
	(in thousands)
Net liability related to sale of future royalties - beginning balance	$	6,953	$	10,365
Non-cash royalty revenue	(1,736)		(2,667)
Non-cash interest expense	98		412
Net liability related to sale of future royalties - ending balance	$	5,315	$	8,110

Collaborations, contracts and licensing agreements (Tables)

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

Schedule of deferred collaborations and contracts revenue

The following table outlines the transaction price and the changes to the related liability balance:


	Transaction Price		Cumulative Collaboration Revenue Recognized		Deferred License Revenue
	(in thousands)
Combined performance obligation	$	50,445	$	37,561	$	12,884
Less contract asset					(1,973)
Total deferred license revenue					10,911

Summary of collaborations

Revenues are summarized in the following table:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands)				(in thousands)
Revenue from collaborations and licenses
Acuitas Therapeutics, Inc.	$	644	$	714	$	1,981	$	2,980
Qilu Pharmaceutical Co., Ltd.	123		3,221		880		10,349

Non-cash royalty revenue
Alnylam Pharmaceuticals, Inc.	572		723		1,736		2,667
Total revenue	$	1,339	$	4,658	$	4,597	$	15,996

Shareholders’ equity (Tables)

9 Months Ended

Sep. 30, 2024

Stockholders' Equity Note [Abstract]

Schedule of stock based compensation expense


	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
	(in thousands, except share and per share data)
Stock options
Options granted during period	—		784,240		4,163,000		5,082,640
Weighted average exercise price	$	—	$	2.25	$	2.49	$	2.78
Restricted stock units (RSUs)
Restricted stock units granted during period	—		—		1,316,200		1,344,550
Grant date fair value	$	—	$	—	$	2.40	$	2.90
Stock compensation expense
Research and development	$	847	$	1,002	$	3,007	$	2,854
General and administrative	1,313		1,481		4,347		4,724
Total stock compensation expense	$	2,160	$	2,483	$	7,354	$	7,578

Nature of business and future operations (Details)	Sep. 30, 2024 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 130,800,000
Long-term debt	$ 0

Significant accounting policies (Details) shares in Millions	9 Months Ended
	Sep. 30, 2024 subsidiary shares	Sep. 30, 2023 shares
Accounting Policies [Abstract]
Number of wholly-owed subsidiaries \| subsidiary	1
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive common shares excluded from calculation of loss per common share (in shares)		21.0
Employee Stock Option
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive common shares excluded from calculation of loss per common share (in shares)	18.7

Fair value measurements - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair value of contingent consideration	$ 8,335	$ 7,373	$ 7,600	$ 7,531
Increase (decrease) in fair value of contingent consideration	$ 735	$ (158)

Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Assets
Investments in marketable securities, non-current	$ 2,964	$ 6,284
Liabilities
Contingent consideration	8,335	7,600	$ 7,373	$ 7,531
Recurring
Assets
Cash and cash equivalents	31,846	26,285
Investments in marketable securities, current	95,948	99,718
Investments in marketable securities, non-current	2,964	6,284
Total	130,758	132,287
Liabilities
Contingent consideration	8,335	7,600
Total	8,335	7,600
Recurring \| Level 1
Assets
Cash and cash equivalents	31,846	26,285
Investments in marketable securities, current	0	0
Investments in marketable securities, non-current	0	0
Total	31,846	26,285
Liabilities
Contingent consideration	0	0
Total	0	0
Recurring \| Level 2
Assets
Cash and cash equivalents	0	0
Investments in marketable securities, current	95,948	99,718
Investments in marketable securities, non-current	2,964	6,284
Total	98,912	106,002
Liabilities
Contingent consideration	0	0
Total	0	0
Recurring \| Level 3
Assets
Cash and cash equivalents	0	0
Investments in marketable securities, current	0	0
Investments in marketable securities, non-current	0	0
Total	0	0
Liabilities
Contingent consideration	8,335	7,600
Total	$ 8,335	$ 7,600

Fair value measurements - Changes in Fair Value of Contingent Consideration (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis [Roll Forward]
Liability at beginning of the period	$ 7,600	$ 7,531
Change in fair value of liability	735	(158)
Liability at end of the period	$ 8,335	$ 7,373

Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Abstract]
Investments in marketable securities, non-current	$ 2,964	$ 2,964	$ 6,284
Accrued investment income receivable	300	300	300
Realized gains or losses	100	100
Investments in marketable long-term securities, Amortized Cost	2,932	2,932	6,273
Cash and Cash Equivalents
Cash and Cash Equivalents [Abstract]
Cash Equivalents, at Carrying Value	25,948	25,948	18,029
Cash Equivalents, Fair Value Disclosure	25,948	25,948	18,029
Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	95,885	95,885	99,964
Gross Unrealized Gain	72	72	30
Gross Unrealized Loss	(9)	(9)	(276)
Fair Value	95,948	95,948	99,718
Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Gross Unrealized Gain	32	32	18
Gross Unrealized Loss	0	0	(7)
Fair Value	3,000	3,000	6,300
Money market \| Cash and Cash Equivalents
Cash and Cash Equivalents [Abstract]
Money Market Funds, at Carrying Value	25,948	25,948	18,029
US treasury bills \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	52,408	52,408
Gross Unrealized Gain	49	49
Gross Unrealized Loss	0	0
Fair Value	52,457	52,457
US government agency bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost			17,918
Gross Unrealized Gain			0
Gross Unrealized Loss			(44)
Fair Value			17,874
US corporate bonds
Debt Securities, Available-for-Sale [Abstract]
Investments in marketable long-term securities, Amortized Cost	2,932	2,932	6,273
US corporate bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	43,477	43,477	71,045
Gross Unrealized Gain	23	23	30
Gross Unrealized Loss	(9)	(9)	(189)
Fair Value	43,491	43,491	70,886
US corporate bonds \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Gross Unrealized Gain	32	32	18
Gross Unrealized Loss	0	0	(7)
Investments in marketable securities, non-current	$ 2,964	$ 2,964	6,284
Yankee bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost			2,000
Gross Unrealized Gain			0
Gross Unrealized Loss			(17)
Fair Value			1,983
US government bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost			9,001
Gross Unrealized Gain			0
Gross Unrealized Loss			(26)
Fair Value			$ 8,975

Investments in marketable securities - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($) numberOfSegments	Sep. 30, 2024 USD ($) numberOfSegments	Dec. 31, 2023 USD ($) numberOfSegments
Investments, Debt and Equity Securities [Abstract]
Debt securities, available-for-sale, unrealized loss Position, number of positions \| numberOfSegments	7	7	27
Accrued investment income receivable	$ 300	$ 300	$ 300
Realized gains or losses	$ 100	$ 100

Investment in Genevant (Details) $ in Millions	9 Months Ended
Investment in Genevant (Details) $ in Millions	Sep. 30, 2024 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investment	$ 0.0
Genevant
Schedule of Equity Method Investments [Line Items]
Sub-licensing revenue percentage	20.00%
Bona fide collaboration Percentage	14.00%
Ownership interest in equity method investment (as a percentage)	16.00%

Accounts payable and accrued liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Trade accounts payable	$ 2,315	$ 3,223
Research and development accruals	1,367	2,884
Professional fee accruals	709	815
Payroll accruals	2,588	3,349
Other Accrued Liabilities	565	0
Accounts payable and accrued liabilities	$ 7,544	$ 10,271

Sale of future royalties - Narrative (Details) - USD ($) $ in Thousands			9 Months Ended		12 Months Ended	63 Months Ended
	Jul. 02, 2019	Jan. 01, 2019	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2015	Sep. 30, 2024
Other Liabilities Disclosure [Line Items]
Non-cash royalty revenue			$ 1,736	$ 2,667
Non-cash interest expense			$ 98	412
Minimum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest			0.75%
Maximum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest			1.125%
OMERS
Other Liabilities Disclosure [Line Items]
Gross proceeds from sale of royalty interest. before advisory fees		$ 20,000
Entitlement of royalties to be received	$ 30,000	30,000
Future royalty payments	30,000	$ 30,000
Transaction costs on sale of royalties	$ 1,500
Effective annual interest rate on royalty liability			2.00%
Non-cash royalty revenue			$ 1,700	2,700		$ (24,400)
Non-cash interest expense			$ 100	$ 400
OMERS \| Minimum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest	1.00%				1.00%
OMERS \| Maximum
Other Liabilities Disclosure [Line Items]
Royalty interest, % interest	2.33%				2.33%

Sale of future royalties - Liability Activity (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
	Jul. 02, 2019	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2015
Liability Related To Sale Of Future Royalties [Roll Forward]
Net liability related to sale of future royalties - beginning balance		$ 6,953	$ 10,365
Non-cash royalty revenue		(1,736)	(2,667)
Non-cash interest expense		98	412
Net liability related to sale of future royalties - ending balance		5,315	8,110
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Non-cash interest expense		98	412
ONPATTRO
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest sold, annual revenue threshold of highest tier	$ 500,000	500,000		$ 500,000
OMERS
Liability Related To Sale Of Future Royalties [Roll Forward]
Non-cash interest expense		100	400
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Non-cash interest expense		$ 100	$ 400

Contingencies and commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Oct. 31, 2014
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 8,335	$ 7,600	$ 7,373	$ 7,531
Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	8,335	$ 7,600
Enantigen's Selling Shareholders \| Recurring
Contingencies and Commitments [Line Items]
Fair value of contingent consideration	$ 8,300				$ 0
Enantigen's Selling Shareholders \| Arbutus Inc.
Contingencies and Commitments [Line Items]
Development and regulatory milestones payment per licensed compound series, maximum					102,500
Development and regulatory milestones payment per royalty, maximum					$ 1,000

Collaborations, contracts and licensing agreements (Details) $ / shares in Units, $ in Thousands					3 Months Ended				9 Months Ended		12 Months Ended	28 Months Ended	63 Months Ended
	Jan. 06, 2022 USD ($)	Jan. 05, 2022 USD ($)	Jul. 02, 2019 USD ($)	Jan. 01, 2019 USD ($)	Sep. 30, 2024 USD ($) product shares	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2024 USD ($) product shares	Sep. 30, 2023 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) product shares	Dec. 31, 2023 USD ($) shares	Dec. 13, 2021 USD ($) $ / shares shares
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Common shares, shares issued (in shares) \| shares					189,438,135				189,438,135				189,438,135	169,867,414
Deferred license revenue, current					$ 10,911				$ 10,911				$ 10,911	$ 11,791
Revenues					1,339		$ 4,658		4,597	$ 15,996
Total deferred license revenue					$ 10,911				$ 10,911				$ 10,911
Number of royalty entitlements \| product					2				2				2
Non Cash Royalty Revenue Related To Sale Of Future Royalties									$ 1,736	2,667
Qilu Pharmaceutical Co, LTD.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Income taxes paid						$ 4,400		$ 4,400
Common Shares \| Qilu Pharmaceutical Co, LTD.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners															2.50%
Non-cash royalty revenue
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues					$ 572		723		$ 1,736	2,667
Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest, % interest									0.75%
Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest, % interest									1.125%
Vaccitech
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Costs related to collaboration					500		700		$ 1,700	1,600
OMERS
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Gross proceeds from sale of royalty interest. before advisory fees				$ 20,000
Entitlement of royalties to be received			$ 30,000	30,000
Future royalty payments			$ 30,000	$ 30,000
Non Cash Royalty Revenue Related To Sale Of Future Royalties									1,700	2,700			$ (24,400)
OMERS \| Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest, % interest			1.00%								1.00%
OMERS \| Maximum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest, % interest			2.33%								2.33%
Arbutus Biopharma Corp
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty guarantees commitments percentage			100.00%	100.00%
Acuitas Therapeutics, Inc. \| Revenue from collaborations and licenses
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues					644		714		1,981	2,980
Alnylam Pharmaceuticals, Inc. \| Non-cash royalty revenue
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues					572		723		1,736	2,667
Qilu Pharmaceutical Co, LTD.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Potential milestone payments															$ 245,000
Premium on closing stock price ($ paid)		$ 4,100
Revenue, remaining performance obligation, amount					12,884				12,884				12,884		50,445
Recovery of direct costs									2,000			$ 1,973
Cumulative Collaboration Revenue Recognized												37,561
Total deferred license revenue					10,900				10,900				$ 10,900
Other deferred costs, gross															$ 600
Amortization of other deferred charges					100		100		100	100
Deferred Revenue Arrangement [Line Items]
Recovery of direct costs									2,000			$ 1,973
Qilu Pharmaceutical Co, LTD. \| Common Shares
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Common shares, shares issued (in shares) \| shares															3,579,952
Share price (in USD per share) \| $ / shares															$ 4.19
Premium on closing stock price (as a percent)															15.00%
Issuance of common shares pursuant to the Open Market Sale Agreement	$ 15,000
Qilu Pharmaceutical Co, LTD. \| One-Time Upfront Cash Payment
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Proceeds from collaborators		$ 40,000
Qilu Pharmaceutical Co, LTD. \| Revenue from collaborations and licenses
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues					$ 123		$ 3,221		880	$ 10,349
ONPATTRO
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty interest sold, annual revenue threshold of highest tier			$ 500,000						$ 500,000		$ 500,000

Shareholders’ equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Oct. 22, 2023	Mar. 03, 2022	Nov. 04, 2021	Oct. 08, 2021	Mar. 04, 2021	Oct. 22, 2020	Aug. 07, 2020	Jan. 10, 2020
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		1,164,000
Common Shares \| Jan 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement											$ 150.0
Common Shares \| Oct 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement									$ 200.0
Common Shares \| Nov 2021 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement						$ 250.0
Jefferies LLC \| Common Shares \| Sale Agreement
Class of Stock [Line Items]
Number of shares issued under agreement (in sales)	633,922	16,499,999	9,848,090
Proceeds from issuance of shares under the agreement	$ 1.4	$ 44.1	$ 26.0
Jefferies LLC \| Common Shares \| Mar 2021 Prospectus Supplement Agreement \| Oct 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement								$ 75.0
Jefferies LLC \| Common Shares \| October 2021 Prospectus Supplement \| Oct 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement							$ 75.0
Common Stock, Value, Subscriptions Expired				$ 29.3
Jefferies LLC \| Common Shares \| March 2022 Prospectus Supplement
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement		$ 25.4
Jefferies LLC \| Common Shares \| March 2022 Prospectus Supplement \| Jan 2020 Oct 2020 and Nov 2021 Registration Stmts
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement					$ 100.0
Jefferies LLC \| Common Shares \| Jan 2020 Prospectus Supplement \| Jan 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement											$ 50.0
Jefferies LLC \| Common Shares \| Aug 2020 Prospectus Supplement \| Jan 2020 Registration Stmt
Class of Stock [Line Items]
Aggregate sale price of common shares under agreement										$ 75.0

Shareholders’ equity - Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in USD per share)	$ 0	$ 2.25	$ 2.49	$ 2.78
Restricted stock units granted during period (in shares)	0	0	1,316,200	1,344,550
Grant date fair value (in USD per share)	$ 2.40	$ 2.90	$ 2.40	$ 2.90
Allocated share-based compensation expense	$ 2,160	$ 2,483	$ 7,354	$ 7,578
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	847	1,002	3,007	2,854
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 1,313	$ 1,481	$ 4,347	$ 4,724
Arbutus Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period (in shares)	0	784,240	4,163,000	5,082,640

Restructuring and Related Activities (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 01, 2024	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		$ 600
Employee Severance
Restructuring Cost and Reserve [Line Items]
Cash severance		2,900
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated, percent	40.00%
Laboratory equipment impairment	$ 200
Restructuring Costs		3,600
Contract Termination
Restructuring Cost and Reserve [Line Items]
Close-out activities with vendors		$ 500

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