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) June 23, 2026
PIMCO Corporate & Income Opportunity Fund
(Exact Name of Registrant as Specified in Its Charter)
| Massachusetts | 811-21238 | 46-6121513 | ||
| (State or other jurisdiction of incorporation) |
(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)
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 |
Name of each exchange | ||
| 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 8.01 Other Events.
On June 23, 2026, the Board of Trustees approved a change to the Fund’s 80% investment policy. Effective August 28, 2026, the Fund invests, under normal circumstances, at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in corporate debt obligations of varying maturities and/or income-producing investments, which may include those of non-corporate issuers. The supplement to the Fund’s prospectus and statement of additional information disclosing this change is attached hereto as Exhibit 99.1.
Item 9.01 Financial Statements and Exhibits.
| (d) | Exhibits | |
| 99.1 | Supplement, dated June 24, 2026 | |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) | |
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 and Secretary | |
Date: June 24, 2026