Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 16

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 16
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 York Stock Exchange (“NYSE”) under the symbol “PTY.” 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 of the Common Shares at the close of business on August 31, 2023, was $10.72 per Common Share. Investment in the Fund’s Common Shares involves substantial risks arising from, among other strategies, the Fund’s ability to invest in debt instruments that are, at the time of purchase, rated below investment grade (below Baa3 by Moody’s Investors Service, Inc. or below BBB- by either S&P Global Ratings, a division of S&P Global Inc., or Fitch, Inc.) or unrated but determined by PIMCO to be of comparable quality, the Fund’s exposure to foreign and emerging markets securities and currencies and to mortgage-related and other asset-backed securities, and the Fund’s use of leverage. ◾ Debt securities of below investment grade quality are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and to repay principal, and are commonly referred to as “high yield” securities or “junk bonds.” ◾ The Fund’s exposure to foreign securities and currencies, and particularly to emerging

markets securities and currencies, involves special risks, including foreign currency risk and the risk that the securities may decline in response to unfavorable political and legal developments, unreliable or untimely information or economic and financial instability. ◾ Mortgage-related and other asset-backed securities are subject to extension and prepayment risk and often have complicated structures that make them difficult to value. ◾ Because of the risks associated with investing in high yield securities, foreign and emerging market securities (and related exposure to foreign currencies) and mortgage-related and other asset-backed securities, and using leverage, an investment in the Fund should be considered speculative. Before investing in the Common Shares, you should read the discussion of the principal risks of investing in the Fund in “Principal Risks of the Fund.” Certain of these risks are summarized in “Prospectus Summary—Principal Risks of the Fund.” The Fund cannot assure you that it will achieve its investment objective, and you could lose all of your investment in the Fund. Under normal circumstances, the Fund will have a short to intermediate average portfolio duration (i.e., within a zero to eight year range), as calculated by the Investment Manager, although it may be shorter or longer at any time or from time to time depending on market conditions and other