PTY PIMCO Corporate and Income Opportunity Fund

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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) September 26, 2023

PIMCO Corporate & Income Opportunity Fund

(Exact Name of Registrant as Specified in Its Charter)

Massachusetts

(State or Other Jurisdiction of Incorporation)

(844) 337-4626

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(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:

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. ☐

Effective October 2, 2023, Alfred T. Murata, Mohit Mittal, and Giang Bui are primarily responsible for the day-to-day management of PIMCO Corporate & Income Opportunity Fund.

Mr. Murata is a managing director and portfolio manager in the Newport Beach office, managing income-oriented, multisector credit, opportunistic and securitized strategies. Morningstar named him Fixed- Income Fund Manager of the Year (U.S.) for 2013. Prior to joining PIMCO in 2001, he researched and implemented exotic equity and interest rate derivatives at Nikko Financial Technologies. He has 21 years of investment experience and holds a Ph.D. in engineering-economic systems and operations research from Stanford University. He also earned a J.D. from Stanford Law School and is a member of the State Bar of California.

Mr. Mittal is a managing director and portfolio manager in the Newport Beach office, and a senior member of the liability driven investment and credit portfolio management teams. He manages multi-sector portfolios with added specialization in long credit, investment grade credit, and unconstrained bond portfolios. In addition, he is the head of U.S. investment grade trading desk. Previously, he was a specialist on PIMCO’s interest rates and derivatives desk. Mr. Mittal joined the firm in 2007 and holds an MBA in finance from the Wharton School of the University of Pennsylvania and an undergraduate degree in computer science from Indian Institute of Technology (IIT) in Delhi, India.

Ms. Bui is an executive vice president in the Newport Beach office and a portfolio manager and trader of securitized debt instruments, focusing on collateralized loan obligations (CLOs), asset-backed collateralized debt obligations, and off-the-run sectors within structured products. Ms. Bui joined PIMCO in 2000 and was previously a member of the bank loan portfolio management team, responsible for bank loan investments and the management of PIMCO-issued CLOs. She has 24 years of investment experience and holds an MBA from the Anderson School of Management at the University of California, Los Angeles and an undergraduate degree from the University of California, San Diego.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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.

Date: September 26, 2023

PIMCO Corporate & Income Opportunity Fund

(the “Fund”)

Supplement dated September 26, 2023 to the Fund’s Prospectus and Statement of Additional

Information (“SAI”), each dated November 23, 2020, as supplemented from time to time

As of October 2, 2023, Giang Bui will serve as co-Portfolio Manager of the Fund, sharing responsibilities with current Portfolio Managers Alfred T. Murata and Mohit Mittal. Accordingly, effective October 2, 2023, the following changes are made to the Fund’s Prospectus and SAI:

Alfred T. Murata, Mohit Mittal and Giang Bui are jointly and primarily responsible for the day-to-day management of the Fund.

Alfred T. Murata, Mohit Mittal and Giang Bui, the portfolio managers who are jointly and primarily responsible for the day-to-day management of the Fund, also manage other registered investment companies, other pooled investment vehicles and other accounts, as indicated in the table below. The following table identifies, as of June 30, 2023 for Messrs. Murata and Mittal and as of August 31, 2023 for Ms. Bui: (i) the number of other registered investment companies, pooled investment vehicles and other accounts managed by the portfolio manager (exclusive of the Fund); and (ii) the total assets of such other companies, vehicles and accounts, and the number and total assets of such other companies, vehicles and accounts with respect to which the advisory fee is based on performance. The information includes amounts managed by a team, committee or other group that includes the portfolio managers.

Securities Ownership

To the best of the Fund’s knowledge, the table below shows the dollar range of shares of the Fund beneficially owned by Alfred T. Murata and Mohit Mittal as of June 30, 2023 and by Giang Bui as of August 31, 2023.

Investors Should Retain This Supplement for Future Reference

PTY_SUPP1_092623

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