ABUS Arbutus Biopharma Corporation

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_________________

FORM 8-K

_________________

CURRENT REPORT

Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):  November 6, 2024

_______________________________

Arbutus Biopharma Corporation

(Exact name of registrant as specified in its charter)

_______________________________

British Columbia, Canada	001-34949	98-0597776
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

701 Veterans Circle

Warminster, Pennsylvania 18974

(Address of Principal Executive Offices) (Zip Code)

(267) 469-0914

(Registrant's telephone number, including area code)

 

(Former name or former address, if changed since last report)

_______________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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. ☐

SIGNATURE

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 hereunto duly authorized.

	Arbutus Biopharma Corporation
Date: November 6, 2024	By:	/s/ David C. Hastings
		David C. Hastings
		Chief Financial Officer

 

EXHIBIT 99.1

Arbutus Reports Third Quarter 2024 Financial Results and Provides Corporate Update

Imdusiran data from IM-PROVE I and IM-PROVE II Phase 2a clinical trials to be presented at upcoming AASLD - The Liver Meeting 2024

Multiple-ascending doses of AB-101 in healthy subjects in the Phase 1a/1b clinical trial were generally safe and well-tolerated with evidence of receptor occupancy

Now dosing cHBV patients with AB-101 in Part 3 of the Phase 1a/1b clinical trial

Cash runway into the fourth quarter of 2026

Conference Call and Webcast Today at 8:45 AM ET

WARMINSTER, Pa., Nov. 06, 2024 (GLOBE NEWSWIRE) -- Arbutus Biopharma Corporation (Nasdaq: ABUS) (“Arbutus” or the “Company”), a clinical-stage biopharmaceutical company leveraging its extensive virology expertise to develop a functional cure for people with chronic hepatitis B virus (cHBV) infection, today reports third quarter 2024 financial results and provides a corporate update.

“We are making significant progress in advancing the development of imdusiran to bring hope to millions of cHBV patients globally,” said Michael J. McElhaugh, Interim President and Chief Executive Officer of Arbutus Biopharma. “In June, we shared promising data from our IM-PROVE I Phase 2a clinical trial, showing that some patients treated with imdusiran and interferon were trending towards a functional cure. We look forward to presenting follow-up data from this trial, as well as end-of-treatment data from patients that received nivolumab in addition to imdusiran and VTP-300 in our IM-PROVE II Phase 2a trial, at the upcoming AASLD meeting. Assuming continued positive data, and with a projected cash runway extending into the fourth quarter of 2026, we are well-positioned to advance imdusiran into a Phase 2b clinical trial as a cornerstone in a treatment regimen aimed at functionally curing cHBV.”

Mr. McElhaugh continued, “Our proprietary oral PD-L1 checkpoint inhibitor, AB-101, is progressing well, as we continue to see dose-dependent receptor occupancy and have now advanced into dosing cHBV patients in our Phase 1a/1b clinical trial. We look forward to providing updates as this trial progresses.”

Clinical Development Update

Imdusiran (AB-729, RNAi Therapeutic) 

• End-of-treatment data from the IM-PROVE I Phase 2a clinical trial evaluating the safety, tolerability and antiviral activity of the combination of imdusiran (4 or 6 doses over 24 or 48 weeks, respectively), nucleos(t)ide analogue (NA) therapy and a short course of pegylated interferon alfa-2a (IFN, 12 or 24 weeks) in patients with cHBV was presented at the EASL Congress in June. The data showed that 33.3% (n=4/12) of patients in Cohort A1 receiving 48 weeks (6 doses) of imdusiran combined with 24 weeks of IFN and NA therapy achieved HBsAg loss at the end-of-treatment that was maintained in 100% of these patients 24 weeks after completing imdusiran and IFN treatment. HBsAg loss was achieved and maintained in 67% of those patients with HBsAg less than 1000 IU/mL at baseline.  A total of six patients from Cohort A1 (n=4) and Cohort A2 (n=2) seroconverted with HBsAg loss. At the time the data was reported, all six of those patients had stopped all therapy, with two of those patients reaching 12 weeks off all therapy with sustained HBsAg and HBV DNA loss. The combination of imdusiran and IFN in this clinical trial was generally safe and well-tolerated. The Company will present a late-breaker poster with additional follow-up data at the upcoming AASLD-The Liver Meeting 2024 later this month.

• End-of treatment data from the IM-PROVE II Phase 2a clinical trial evaluating the safety and immunogenicity of imdusiran, NA therapy and Barinthus Bio’s VTP-300, an HBV antigen-specific immunotherapy was presented at the EASL Congress in June. The data showed that the combination of imdusiran and VTP-300 was generally safe and well-tolerated. At 24-weeks post-end of treatment, statistical significance (p<0.05) was achieved in HBsAg levels between the VTP-300 arm (n=5) and placebo (n=6). IM-PROVE II includes an additional cohort of patients who received 4 doses of imdusiran plus NA therapy for 24 weeks followed by VTP-300 plus up to two low doses of nivolumab, an approved anti-PD-1 monoclonal antibody. The Company will present a late-breaker poster with preliminary end-of-treatment data from this additional cohort at the upcoming AASLD - The Liver Meeting 2024 in November.

AB-101 (Oral PD-L1 Inhibitor)

• AB-101-001 is a Phase 1a/1b double-blind, randomized, placebo-controlled clinical trial designed to investigate the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of single- and multiple-ascending oral doses of AB-101 in healthy subjects and patients with cHBV.
• 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 (n=8) or placebo (n=2) daily for 7 days. AB-101 was generally well-tolerated with evidence of dose-dependent receptor occupancy. In the 25 mg cohort, all subjects showed evidence of receptor occupancy, with seven of the eight subjects demonstrating receptor occupancy greater than 70% during the 7-day dosing period.
• Arbutus has moved into Part 3 of this clinical trial which evaluates repeat dosing of AB-101 for 28 days in patients with cHBV and expects to report preliminary data in the first half of next year.
  

LNP Litigation Update

• Expert reports and expert depositions continue in the Moderna lawsuit. A trial date has been set for September 24, 2025, and is subject to the Court’s availability.
• The lawsuit against Pfizer/BioNTech is ongoing and a date for the claim construction hearing has been set for December 18, 2024.  

Arbutus continues to protect and defend its intellectual property, which is the subject of the on-going lawsuits against Moderna and Pfizer/BioNTech. The Company is seeking fair compensation for Moderna’s and Pfizer/BioNTech’s use of its patented LNP technology that was developed with great effort and at a great expense, without which Moderna’s and Pfizer/BioNTech’s COVID-19 vaccines would not have been successful.

Financial Results

Cash, Cash Equivalents and Investments

As of September 30, 2024, the Company had cash, cash equivalents and investments in marketable securities of $130.8 million compared to $132.3 million as of December 31, 2023. During the nine months ended September 30, 2024, the Company used $54.5 million in operating activities, which was partially offset by $44.1 million of net proceeds from the issuance of common shares under its “at-the-market” offering program (ATM Program) and $6.1 million of proceeds from the exercise of stock options. The Company did not issue any common shares under its ATM program in the third quarter of 2024. The Company expects its 2024 cash burn to range from $63 million to $67 million.  With the organizational changes in the third quarter, the Company believes its cash, cash equivalents and investments in marketable securities will be sufficient to fund its operations into the fourth quarter of 2026.

Revenue

Total revenue was $1.3 million for the three months ended September 30, 2024 compared to $4.7 million for the same period in 2023. The decrease of $3.4 million was due primarily to: i) a decrease in license revenue recognized under the Company’s licensing agreement with Qilu Pharmaceutical; and ii) a decrease in license royalty revenue from Alnylam due to lower sales of ONPATTRO in 2024 compared to 2023.

Operating Expenses

Research and development expenses were $14.3 million for the three months ended September 30, 2024 compared to $20.2 million for the same period in 2023. The decrease of $5.9 million was due primarily to the discontinuation of the Company’s coronavirus and AB-161 programs in September 2023, along with related headcount reductions. General and administrative expenses were $4.5 million for the three months ended September 30, 2024 compared to $5.8 million for the same period in 2023. The decrease of $1.3 million was due primarily to decreased employee compensation and non-cash stock-based compensation expenses due to headcount reductions. The Company also incurred a $3.6 million one-time restructuring charge in the third quarter of 2024 related to its decision to cease all discovery efforts, discontinue its IM-PROVE III clinical trial, and reduce headcount to streamline the organization with a focus on advancing the clinical development of imdusiran and AB-101.

Net Loss

The Company’s net loss was $19.7 million for the three months ended September 30, 2024 and $20.1 million for the same period in 2023, with a loss per basic and diluted common share of $0.10 and $0.12, respectively.

Outstanding Shares

As of September 30, 2024, the Company had approximately 189.4 million common shares issued and outstanding. In addition, the Company had approximately 18.7 million stock options and unvested restricted stock units outstanding as of September 30, 2024. Roivant Sciences Ltd. owned approximately 21% of the Company’s outstanding common shares as of September 30, 2024.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF LOSS
(in thousands, except share and per share data)
	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		)

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands)
	September 30, 2024				December 31, 2023
Cash, cash equivalents and marketable securities, current	$	127,794			$	126,003
Accounts receivable and other current assets	4,983				6,024
Total current assets	132,777				132,027
Property and equipment, net of accumulated depreciation	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
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 stockholders’ equity	106,890				106,018
Total liabilities and stockholders’ equity	$	140,441			$	144,401

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
	Nine Months Ended September 30,
	2024				2023
Net loss	$	(57,388	)		$	(53,537	)
Non-cash items	5,453				4,613
Change in deferred license revenue	(880		)		(10,349		)
Other changes in working capital	(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
Investments in marketable securities	98,912				127,145
Cash, cash equivalents and marketable securities, end of period	$	130,758			$	144,676

Conference Call and Webcast Today

Arbutus will hold a conference call and webcast today, Wednesday, November 6, 2024, at 8:45 AM Eastern Time to provide a corporate update. To dial-in for the conference call by phone, please register using the following link: Registration Link. A live webcast of the conference call can be accessed through the Investors section of Arbutus' website at www.arbutusbio.com.

An archived webcast will be available on the Arbutus website after the event.

About Imdusiran (AB-729)

Imdusiran is an RNA interference (RNAi) therapeutic specifically designed to reduce all HBV viral proteins and antigens including hepatitis B surface antigen, which is thought to be a key prerequisite to enable reawakening of a patient’s immune system to respond to the virus. Imdusiran targets hepatocytes using Arbutus’ novel covalently conjugated N-Acetylgalactosamine (GalNAc) delivery technology enabling subcutaneous delivery. Clinical data generated thus far has shown single and multiple doses of imdusiran to be generally safe and well-tolerated, while also providing meaningful reductions in hepatitis B surface antigen and hepatitis B DNA. Imdusiran is currently in multiple Phase 2a clinical trials.  

About AB-101

AB-101 is our oral PD-L1 inhibitor candidate that we believe will allow for controlled checkpoint blockade while minimizing the systemic safety issues typically seen with checkpoint antibody therapies. 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. Preclinical data generated thus far indicates that AB-101 mediates re-activation of exhausted HBV-specific T-cells from cHBV patients. We believe AB-101, when used in combination with other approved and investigational agents, could potentially lead to a functional cure in patients chronically infected with HBV. AB-101 is currently being evaluated in a Phase 1a/1b clinical trial.

About HBV

Hepatitis B is a potentially life-threatening liver infection caused by the hepatitis B virus (HBV). HBV can cause chronic infection which leads to a higher risk of death from cirrhosis and liver cancer. Chronic HBV infection represents a significant unmet medical need. The World Health Organization estimates that over 250 million people worldwide suffer from chronic HBV infection, while other estimates indicate that approximately 2.4 million people in the United States suffer from chronic HBV infection. Approximately 820,000 people die every year from complications related to chronic HBV infection despite the availability of effective vaccines and current treatment options.

About Arbutus

Arbutus Biopharma Corporation (Nasdaq: ABUS) 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). We believe the key to success in developing a functional cure involves suppressing HBV DNA, reducing surface antigen, 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. For more information, visit www.arbutusbio.com.

Forward-Looking Statements and Information

This press release contains forward-looking statements within the meaning of the Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, and forward-looking information within the meaning of Canadian securities laws (collectively, forward-looking statements). Forward-looking statements in this press release include statements about our future development plans for our product candidates; the expected cost, timing and results of our clinical development plans and clinical trials with respect to our product candidates; our expectations with respect to the release of data from our clinical trials and the expected timing thereof; our expectations and goals for our collaborations with third parties and any potential benefits related thereto; our expectations regarding our organizational changes; the potential for our product candidates to achieve success in clinical trials; our expectations regarding our pending litigation matters; and our expected financial condition, including our anticipated net cash burn, the anticipated duration of cash runways and timing regarding needs for additional capital.

With respect to the forward-looking statements contained in this press release, Arbutus has made numerous assumptions regarding, among other things: the effectiveness and timeliness of preclinical studies and clinical trials, and the usefulness of the data; the timeliness of regulatory approvals; the continued demand for Arbutus’ assets; and the stability of economic and market conditions. While Arbutus considers these assumptions to be reasonable, these assumptions are inherently subject to significant business, economic, competitive, market and social uncertainties and contingencies, including uncertainties and contingencies related to patent litigation matters.

Additionally, there are known and unknown risk factors which could cause Arbutus’ actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements contained herein. Known risk factors include, among others: anticipated pre-clinical studies and clinical trials may be more costly or take longer to complete than anticipated, and may never be initiated or completed, or may not generate results that warrant future development of the tested product candidate; Arbutus may elect to change its strategy regarding its product candidates and clinical development activities; Arbutus may not receive the necessary regulatory approvals for the clinical development of Arbutus’ products; economic and market conditions may worsen; Arbutus may not realize the anticipated benefits from the organizational changes; Arbutus may incur additional unexpected expenses in connection with the organizational changes; Arbutus may experience additional employee turnover as a result of the organizational changes; uncertainties associated with litigation generally and patent litigation specifically; and Arbutus and its collaborators may never realize the expected benefits of the collaborations; market shifts may require a change in strategic focus.

A more complete discussion of the risks and uncertainties facing Arbutus appears in Arbutus’ Annual Report on Form 10-K, Arbutus’ Quarterly Reports on Form 10-Q and Arbutus’ continuous and periodic disclosure filings, which are available at www.sedar.com and at www.sec.gov. All forward-looking statements herein are qualified in their entirety by this cautionary statement, and Arbutus disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Contact Information

Investors and Media

Lisa M. Caperelli
Vice President, Investor Relations
Phone: 215-206-1822
Email: lcaperelli@arbutusbio.com

Exhibit 99.2

 

NASDAQ: ABUS www.arbutusbio.com November 6, 2024 Corporate Presentation © 2024 Arbutus Biopharma, Inc.

Forward - Looking Statements This presentation contains forward - looking statements within the meaning of the U . S . Private Securities Litigation Reform Act of 1995 and Canadian securities laws . All statements that are not historical facts are hereby identified as forward - looking statements for this purpose and include, among others, statements relating to : the potential market opportunity for HBV ; Arbutus’ ability to meet a significant unmet medical need ; the sufficiency of Arbutus’ cash and cash equivalents for the anticipated durations ; the expected cost, timing and results of Arbutus’ clinical development plans and clinical trials, including its clinical collaborations with third parties ; the potential for Arbutus’ product candidates to achieve their desired or anticipated outcomes ; Arbutus’ expectations regarding the timing and clinical development of Arbutus’ product candidates, including its articulated clinical objectives ; the timeline to a combination cure for HBV ; Arbutus’ expectations regarding its technology licensed to third parties ; the expected timing and payments associated with strategic and/or licensing agreements ; the patent infringement lawsuits ; and other statements relating to Arbutus’ future operations, future financial performance, future financial condition, prospects or other future events . With respect to the forward - looking statements contained in this presentation, Arbutus has made numerous assumptions regarding, among other things : the timely receipt of expected payments ; the effectiveness and timeliness of pre - clinical studies and clinical trials, and the usefulness of the data ; the timeliness of regulatory approvals ; the continued demand for Arbutus’ assets ; and the stability of economic and market conditions . While Arbutus considers these assumptions to be reasonable, these assumptions are inherently subject to significant business, economic, competitive, market and social uncertainties, and contingencies including uncertainties and contingencies related to patent litigation matters . Forward - looking statements herein involve known and unknown risks, uncertainties and other factors that may cause the actual results, events or developments to be materially different from any future results, events or developments expressed or implied by such forward - looking statements . Such factors include, among others : anticipated pre - clinical and clinical trials may be more costly or take longer to complete than anticipated, and may never be initiated or completed, or may not generate results that warrant future development of the tested drug candidate ; changes in Arbutus’ strategy regarding its product candidates and clinical development activities ; Arbutus may not receive the necessary regulatory approvals for the clinical development of Arbutus' products ; economic and market conditions may worsen ; uncertainties associated with litigation generally and patent litigation specifically ; market shifts may require a change in strategic focus ; and the parties may never realize the expected benefits of the collaborations . A more complete discussion of the risks and uncertainties facing Arbutus appears in Arbutus' Annual Report on Form 10 - K, Quarterly Report on Form 10 - Q and Arbutus' periodic disclosure filings, which are available at www . sec . gov and at www . sedar . com . All forward - looking statements herein are qualified in their entirety by this cautionary statement, and Arbutus disclaims any obligation to revise or update any such forward - looking statements or to publicly announce the result of any revisions to any of the forward - looking statements contained herein to reflect future results, events or developments, except as required by law . 2 © 2024 Arbutus Biopharma, Inc.

Arbutus Biopharma (ABUS) Overview ~250M 1 people have cHBV with current treatment options for most patients limited to life - long suppressive therapy, representing a need for a finite curative regimen. HBV Represents a Large Commercial Opportunity ` Phase 2a clinical trial data with imdusiran shows that it is generally safe, well - tolerated and significantly reduces HBsAg. Potential functional cure data in 2H 2024. Multiple Phase 2 Clinical Trials with Near Term Catalysts Cash runway into Q4 2026. Seeking damages from patent litigation filed against Moderna & Pfizer/BioNTech for COVID - 19 vaccine sales. Strong Financial Position Leveraging virology expertise and proven track record of success to address global health issue. Focused on Developing a Functional Cure for Patients with Chronic HBV HBV: Hepatitis B Virus | cHBV: chronic HBV | HBsAg : HBV Surface Antigen 3 © 2024 Arbutus Biopharma, Inc. 1 https://www.who.int/news - room/fact - sheets/detail/hepatitis - b

PHASE 1 PHASE 2 PHASE 3 Strategy for Value Creation Develop a combination therapy that includes antivirals and immunomodulators to provide a finite, curative treatment for people with chronic HBV Imdusiran (AB - 729) RNAi Therapeutic (Subcutaneous) AB - 101 PD - L1 Inhibitor (Oral) cHBV Program AB - 101 in Healthy subjects & cHBV patients AB - 101 - 001 IM - PROVE I IM - PROVE II Functional cure goal Functional Cure Sustained HBsAg loss and HBV DNA <LLOQ 24 weeks off - treatment, with or without anti - HBs . ≥ 20% NA: Nucleoside Analogue | LLOQ : Lower Limit of Quantification | anti - HBs : hepatitis B surface antibodies 4 © 2024 Arbutus Biopharma, Inc. Imdusiran + Peg - IFN α - 2a + NA Imdusiran + vaccine + NA +/ - nivolumab

Chronic HBV (2M in U.S.) >250M HBV: A Global Public Health Threat with a Significant Unmet Medical Need Treated 7M 3% Diagnosed 32M 13% Sources: https://www.who.int/news - room/fact - sheets/detail/hepatitis - b https://www.hepb.org/what - is - hepatitis - b/what - is - hepb/facts - and - figures/ Pegasys , PEG - Intron, Baraclude and Viread Package Inserts 5 © 2024 Arbutus Biopharma, Inc. HIV : Human Immunodeficiency Virus | HCV: Hepatitis C Virus | HCC: Hepatocellular carcinoma • Most common serious liver infection • 100x more infectious than HIV & 10x more infectious than HCV • Primary cause of liver cancer (HCC, second - leading cause of cancer deaths globally ) • Limitations with current treatments, including < 10 % functional cure rate • “Silent infection” that is transmittable through body fluids and from mother to child • Significant patient stigma that can impact employment and family Million DEATHS/YEAR ~ 1.1

6 © 2024 Arbutus Biopharma, Inc. Rationale for a Functional Cure in HBV Prevent complications of disease progression - HBsAg loss is strongly associated with a reduced risk of long - term adverse clinical outcomes observed among cHBV patients regardless of the presence of cirrhosis. 2, 3 Decrease HBV burden by minimizing patient stigma. 3 Address the need for finite and more efficacious HBV treatments that further improve long - term outcomes and lead to earlier treatment to prevent progression of disease and associated healthcare costs. 4, 5 Benefits of a Functional Cure for Patients 1 Yip, Terry Cheuk - Fung et al, Journal of Hepatology, 2018; Vol 70, Issue 3, 361 - 370 2 Moini, M. HBsAg Loss as a Treatment for Chronic HBV Infection: HBV Cure. Viruses 2022, 14, 657 3 Smith - Palmer J, et al. Impact of Stigma on People Living with Chronic Hepatitis B. Patient Relat Outcome Meas. 2020;11:95 - 107 4 Chahal, et al, Open Forum Infectious Diseases 2019 Jan; 61(1) 5 Razavi - Shearer, et al, J Viral Hepat. 2023; 00:1 - 9 HBsAg Loss Further Reduces HCC Risk After Complete Viral Suppression with NA 1

Suppress Reduce Boost Viral DNA Viral Antigen - HBsAg Host Immune System Leading to an HBV Cure 3 - Pronged Approach to Therapeutic Success Therapeutic success will require a combination of agents with complementary MOAs. Suppress HBV DNA Reduce viral antigens Boost host immune response 7 NA RNAi RNAi RNAi PD - L1 Inhibitor Interferon Therapeutic Vaccines © 2024 Arbutus Biopharma, Inc.

8 © 2024 Arbutus Biopharma, Inc. Imdusiran RNAi Therapeutic

Proprietary GalNAc - conjugate delivery technology provides liver targeting and enables subcutaneous dosing Single trigger RNAi agent targeting all HBV transcripts Inhibits HBV replication and lowers all HBV antigens Pan - genotypic activity across HBV genotypes Demonstrated complementarity with other agents Actively targets the liver Active against cccDNA derived and integrated HBsAg transcripts Favorable profile in long term preclinical safety studies RNAi Therapeutic Imdusiran GalNAc n Linker Polymerase, Core Ag, eAg , pgRNA sAg sAg HBx 9 © 2024 Arbutus Biopharma, Inc.

Imdusiran: Key Takeaways from Clinical Trials to Date Imdusiran provided robust and comparable HBsAg declines (~1.5 - 2.0 log 10 ) regardless of dose, dosing interval, HBeAg or DNA status When combined with a NA and a short course of IFN, imdusiran led to HBsAg loss in up to 67% of patients with HBsAg <1000 IU/mL at baseline Imdusiran was generally safe and well - tolerated after completing dosing in >200 cHBV patients Imdusiran resulted in HBV - specific T - cell immune restoration and decrease of exhausted T - cells in some patients 10 © 2024 Arbutus Biopharma, Inc. Data from Phase 1 and all Phase 2a clinical trials conducted to date with imdusiran .

Phase 2a POC Clinical Trial Imdusiran in combination with ongoing NA therapy and short courses of Peg - IFN α - 2 a in cHBV patients IM - PROVE I: POC: Proof of Concept Primary objective : evaluate safety and tolerability of imdusiran in combination with Peg - IFN α - 2a in patients with NA - suppressed cHBV After completing IFN treatment and the 24 - week NA only follow - up period, patients who meet the criteria to discontinue NA therapy will be followed for an additional 48 weeks off therapy Data presented at EASL Congress 2024 showed that 48 weeks of imdusiran plus 24 weeks of IFN therapy was generally safe, well - tolerated and achieved sustained HBsAg loss in 33% of patients after completion of IFN treatment, which was maintained in 100% of these patients 24 weeks after completing imdusiran and IFN treatment Multi - center, open - label Phase 2a 11 © 2024 Arbutus Biopharma, Inc. Weeks NA only Follow - up (24 weeks) A1: Imdusiran x 2 doses + NA + 24w IFN (n=12) A2: NA + 24w IFN (n=13) B1: Imdusiran x 1 dose + NA + 12w IFN (n=8) B2: NA + 12w IFN (n=10) Imdusiran x 4 doses + NA (60mg Q8W) n=43 HBeAg - Randomize NA only Follow - up (24 weeks) 1 52 28 24 40 Off Therapy Follow - up (24 - 48 weeks) Off Therapy Follow - up (24 - 48 weeks) 64 76 POC: Proof of Concept

IM - PROVE I: Imdusiran with Short Courses of IFN Leads to Sustained HBsAg Loss Cohort A2: IDR x 4 + NA + IFN x 24W (N = 13) Cohort A1: IDR x 6 + NA + IFN x 24W (N = 12) Achieved HBsAg ≤ LLOQ (0.05 IU/mL) 3/13 (23%) 4/12 (33.3%) EOT (W52) 7/25 (28%) 2/13 (15.4%) 4/12 (33.3%) 24 weeks post - EOT (NA therapy only) 6/25 (24%) 3/13 (23%) 9/12 (75%) Discontinued NA therapy W: week; EOT: end - of - treatment Number of Patients with HBsAg Loss at Key Timepoints Data presented at EASL 2024 Key Findings: 33% of patients in Cohort A1 reached and maintained HBsAg loss for 24 weeks after completing imdusiran and IFN treatment HBsAg loss was achieved in 67% of those patients in Cohort A1 with HBsAg less than 1000 IU/mL at baseline Patients with sustained HBsAg loss had corresponding high anti - HBs levels (43.8 to >1000 mIU /mL) Imdusiran and 24 weeks of IFN was generally safe and well - tolerated – No related SAEs and no AEs leading to discontinuation All 6 patients with HBsAg loss (plus an additional 15 from all 4 Cohorts, n=21 total) discontinued NA therapy after the 24 weeks post - EOT visit – 2/6 patients have reached 12 weeks off all therapy and sustained HBsAg loss – 1 patient in Cohort B2 achieved functional cure during the NA discontinuation period 12 Functional Cure: Sustained HBsAg loss and HBV DNA <LLOQ 24 weeks off - treatment, with or without anti - HBs. © 2024 Arbutus Biopharma, Inc.

IM - PROVE I: Imdusiran with 24 Weeks of IFN Leads to Sustained HBsAg Loss in 6 patients Data presented at EASL 2024 13 © 2024 Arbutus Biopharma, Inc.

Phase 2a POC Clinical Trial Evaluating imdusiran in combination with Barinthus Bio’s immunotherapeutic, VTP - 300, and NA with or without low dose nivolumab IM - PROVE II: Primary objective: evaluate safety and reactogenicity of imdusiran followed by VTP - 300 or placebo At Week 48 all participants who meet the criteria to discontinue NA therapy will be followed for an additional 48 weeks off therapy Results presented at EASL Congress 2024 from Group A and B showed that imdusiran followed by VTP - 300 was generally safe and well - tolerated and led to maintenance of lower HBsAg levels during the post - treatment follow - up period Clinical trial expanded to include an additional arm with nivolumab ( Opdivo ® ) with preliminary data expected in 2H 2024 Full rights retained by the Companies of their respective product candidates and all costs split equally 14 Off Therapy Follow - up (24 - 48 weeks) Group A: VTP - 300 + NA (n=20) Group B: NA + placebo (n=20) 1 Imdusiran x 4 doses + NA (60mg Q8W) n=40 Randomize Weeks Imdusiran + NA (60mg Q8W) n=22 24 Group C: VTP - 300 + NA + Nivo 1 48 26 24 Weeks 48 Off Therapy Follow - up (24 - 48 weeks) © 2024 Arbutus Biopharma, Inc. POC: Proof of Concept

IM - PROVE II: Imdusiran and VTP - 300 Achieve Statistical Significance in Lowering HBsAg Levels 15 © 2024 Arbutus Biopharma, Inc. Imdusiran led to declines of - 1.8 log10 by Week 26, 95% of subjects had HBsAg <100 at time of VTP - 300 or placebo dosing More subjects maintained HBsAg thresholds of <100 IU/mL and <10 IU/mL when administered VTP - 300 vs placebo At 24 weeks post - EOT (Week 72, N=11), there was a significant difference in HBsAg levels between groups, which may reflect the d elayed effect of VTP - 300 on HBsAg levels observed in other trials Data presented at EASL 2024 Subject number Cohort A: VTP - 300 (N=20) Cohort B: placebo (N=20) N=19* N=19* N=5 N=6 N=19 BSL=baseline; WK=week; EOT=end of treatment; * 2 subjects did not reach timepoint by datacut ; # N=2 and † N=1 subject censored after Week 60 visit due to NA restart HBsAg Thresholds Achieved by Visit EOT EOT 1 1 † # * p < 0.05 Mean [SE] Log 10 HBsAg Level by Visit Log 10 HBsAg (IU/mL) * by ANCOVA EOT † NA d/c assessment imdusiran doses VTP - 300 doses # N=2 and † N=1 subject censored after Week 60 visit due to NA restart #

Strategic Collaboration Exclusive Licensing* and Strategic Partnership Develop, manufacture and commercialize imdusiran in mainland China, Hong Kong, Macau and Taiwan Imdusiran Upfront payment (received in 2022) $40M Equity investment (received in 2022) $15M Commercialization and milestone payments Up to $245M Tiered royalties on annual sales Double - digit up to low twenties % *ABUS retains the non - exclusive right to develop and manufacture in the Qilu territory for exploiting AB - 729 in the rest of the world Deal economics for Arbutus: Qilu Pharmaceutical: One of the leading pharmaceutical companies in China, provides development, manufacturing, and commercialization expertise to this partnership China 16 © 2024 Arbutus Biopharma, Inc.

17 © 2024 Arbutus Biopharma, Inc. AB - 101 Oral PD - L1 Checkpoint Inhibitor

AB - 101: Oral PD - L1 Inhibitor for HBV Immune Reactivation PD - 1: Programmed death ligand protein | Abs: Antibodies Currently in a Phase 1a/1b clinical trial Rationale • HBV immune tolerance is a critical driver of cHBV infection • PD - 1:PD - L1 checkpoint axis plays a key role in immune tolerization in cHBV • PD - L1 expression upregulated during HBV infection • PD - 1 upregulated on HBV - specific T - and B - cells • Inhibition associated with HBsAg loss in some cHBV patients AB - 101 • Blocks PD - L1/PD - 1 interaction at sub - nM concentrations • Activates HBV - specific immune responses in T - cells from cHBV patients in vitro • Novel MOA identified • Demonstrates a robust checkpoint mediated in vivo effect • Improves HBV - specific T - and B - cell responses ex vivo Small - Molecule Inhibitor Approach • Allows controlled checkpoint blockade • Enables oral dosing • Designed to reduce systemic safety issues seen with Abs 18 © 2024 Arbutus Biopharma, Inc.

AB - 101: Small - Molecule Oral PD - L1 Inhibitor for HBV AB - 101 is highly potent and activates HBV specific immune cells from chronic HBV patients AB - 101 reinvigorates HBV - specific cHBV patient T - cells PBMCs N= cells from 9 cHBV patients *p< - 0.05 PBMC: P eripheral Blood Mononuclear Cells PDL1 * Inactive AB - 101 * 0 3 2 1 IFN - y Fold Increase Over HBV peptide alone 19 © 2024 Arbutus Biopharma, Inc. Once daily oral administration of AB - 101 resulted in statistically significant tumor reduction Study Day MC38 Tumor Mouse Model Tumor Volume (mm 3 ) Data presented at EASL 2022

20 © 2024 Arbutus Biopharma, Inc. Part 1: SAD (n=8/cohort – 6:2) 1C: 10 mg 1B: 3 mg 1A: 1 mg Part 2: MAD (n=10/cohort – 8:2) 2A: 10 mg daily x 7 days 2B: 25 mg daily x 7 days † 3A: 10 mg daily x 28d 3B: Dose/interval TBD x 28d 3C: Dose/interval TBD x 28d AB - 101 - 001: Phase 1a/1b Clinical Trial with AB - 101 Parts 1 & 2 – Healthy Subjects ** Part 3 – cHBV Patients (n=12/cohort – 10:2) Virally suppressed ** Additional doses may be tested in Part 1 and Part 2 †In the 25mg cohort, preliminary data shows all subjects with evidence of receptor occupancy, with 7 of the 8 subjects demonstrating receptor occupancy >70% during the 7 - day dosing period. * Preliminary data shows AB - 101 is well tolerated and binds to the receptor target. In the 25mg cohort, all 5 evaluable subjects showed evidence of receptor occupancy between 50 - 100%. 1D: 25 mg * Patient dosing initiated in Q3 2024 Preliminary data expected in 1H 2025

LNP Litigation: Update Moderna - Trial date September 24, 2025 (subject to the Court’s availability)* • Markman Hearing occurred February 8, 2024 – judge heard arguments on claim construction – Court provided ruling on April 3 and agreed with Arbutus’s position on the majority of the claims • Next Steps – Expert reports / depositions 80% to Genevant Arbutus owns 16% of Genevant 20% to Arbutus Royalties/litigation related damages *Above referenced date is included in the 8/15/2024 Stipulation to Extend Time. Pfizer • Lawsuit ongoing • Markman Hearing scheduled for December 18, 2024 21 © 2024 Arbutus Biopharma, Inc.

2024 Key Milestones 22 Anticipated Timing 2024 Milestone 1H IM - PROVE I Phase 2a ( imdusiran + IFN): End - of - treatment data 1H IM - PROVE II Phase 2a ( imdusiran + VTP - 300): End - of - treatment data 1H AB - 101 - 001: Preliminary data from healthy subject cohorts 2H IM - PROVE II Phase 2a ( imdusiran + VTP - 300 + nivolumab): End - of - treatment data 2H AB - 101 - 001: Preliminary data from multiple - ascending dose healthy subject cohorts © 2024 Arbutus Biopharma, Inc.

Investment Highlights Strong financial position Indication with significant unmet medical need & large market opportunities Patented LNP technology Portfolio of internally discovered assets with distinct MOAs Lead HBV compound – imdusiran (AB - 729) RNAi therapeutic in multiple Phase 2a combination clinical trials Team with virology expertise and proven track record Focused on developing a functional cure for HBV Cash balance* of $130.8M as of Sept. 30, 2024, cash runway into Q4 2026; 2024 cash burn between $63M and $67M Data shows imdusiran is generally safe and well - tolerated and has shown meaningful suppression of HBsAg while on - or off - treatment RNAi therapeutic Oral PD - L1 inhibitor Receiving licensing royalties arising from Alnylam’s Onpattro ® and seeking damages from patent litigation suits filed against Moderna & Pfizer/BioNTech for COVID - 19 vaccine sales Discovered, developed & commercialized multiple drugs MOA: Mechanism of Action | PD - L1: Programmed death - ligand 1 | HBsAg: Hepatitis B surface antigen 23 © 2024 Arbutus Biopharma, Inc. *Consists of cash, cash equivalents and marketable securities

Thank You 24 © 2024 Arbutus Biopharma, Inc.

v3.24.3

Cover	Nov. 06, 2024
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Nov. 06, 2024
Entity File Number	001-34949
Entity Registrant Name	Arbutus Biopharma Corporation
Entity Central Index Key	0001447028
Entity Tax Identification Number	98-0597776
Entity Incorporation, State or Country Code	A1
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
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Shares, without par value
Trading Symbol	ABUS
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false

---