Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 21

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 21
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| AppendixA - Description of Securities Ratings                                           |  A-1 |

PIMCO Corporate & Income Opportunity Fund Prospectus Summary This is only a summary. This summary may not contain all of the information that you should consider before investing in PIMCO Corporate & Income Opportunity Fund’s (the “Fund”) common shares of beneficial interest, par value $0.00001 per share (the “Common Shares”). You should review the more detailed information contained in this prospectus and in any related prospectus supplement and in the Statement of Additional Information, especially the information set forth under the heading “Principal Risks of the Fund.” The Fund The Fund is a diversified, closed-end management investment company. The Fund commenced operations on December 27, 2002, following the initial public offering of its Common Shares. Effective February 1, 2012, the Fund changed its name from PIMCO Corporate Opportunity Fund to its current name, PIMCO Corporate & Income Opportunity Fund. The Common Shares are listed on the New York Stock Exchange (“NYSE”) under the symbol “PTY.” As of August 31, 2023, the net assets of the Fund attributable to Common Shares were $1,534,999,472 and the Fund had outstanding 143,115,790 Common Shares and 8,506 auction rate preferred shares of beneficial interest (“ARPS,” and together with any other preferred shares issued by the Fund, “Preferred Shares”). The last reported sale price of the Common Shares, as reported by the NYSE on August 31, 2023, was $14.15 per Common Share. The net asset value (“NAV”) of the Common Shares at the close of business on August 31, 2023, was $10.72 per Common Share. See “Description of Capital Structure.” The Offering The Fund may offer, from time to time, in one or more offerings, Common Shares on terms to be determined at the time of the offering. The Common Shares may be offered at prices and on terms to be set forth in one or more prospectus supplements. You should read this prospectus and the applicable prospectus supplement carefully before you invest in the Common Shares. Common Shares may be offered directly to one or more purchasers, through agents designated from time to time by the Fund, or to or through underwriters or dealers. The prospectus supplement relating to an offering will identify any agents, underwriters or dealers involved in the sale of Common Shares, and will set forth any applicable purchase price, fee