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) March 30, 2022

PIMCO Corporate & Income Opportunity Fund

(Exact Name of Registrant as Specified in Its Charter)

Massachusetts

(State or Other Jurisdiction of Incorporation)

811-21238	466121513
(Commission File Number)	(IRS Employer Identification No.)
1633 Broadway, New York, NY	10019
(Address of Principal Executive Offices)	(Zip Code)

(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:

☐ 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:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common shares	PTY	New York Stock Exchange

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. ☐

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On March 25, 2022, the Board of Trustees (the “Board”) of PIMCO Corporate & Income Opportunity Fund (the “Fund”) approved a change to the Fund’s fiscal year end from July 31 to June 30, beginning with the current fiscal year, which will now end on June 30, 2022, effective April 1, 2022. The change will be reflected in the Fund’s annual report on Form N-CSR for the period August 1, 2021 to June 30, 2022. The prospectus supplement disclosing this change is attached hereto as Exhibit 99.1.

Item 8.01 Other Events.

On March 25, 2022, the Board approved the removal of the Fund’s non-fundamental investment guideline limiting the Fund’s investments in securities denominated in foreign (non-U.S.) currencies to 25% of the Fund’s total assets, effective April 29, 2022. The Fund remains subject to other limits contained in the prospectus, including the limit on investments in emerging market securities and instruments. The prospectus supplement disclosing this change is attached hereto as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Prospectus Supplement, dated March 30, 2022

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.

PIMCO Corporate & Income Opportunity Fund
By:	/s/ Ryan G. Leshaw
Name:	Ryan G. Leshaw
Title:	Chief Legal Officer

Date: March 30, 2022