Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 362

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 362
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 Fund pursuant to derivatives potentially could affect the amount, timing or characterization of Fund distributions. In addition, the tax treatment of such investment strategies may be changed by regulation or otherwise. Also, suitable derivative and/or hedging transactions may not be available in all circumstances, and there can be no assurance that the Fund will be able to identify or employ a desirable derivative and/or hedging transaction at any time or from time to time or, if a strategy is used, that it will be successful. As further described below under “Additional Risk Factors in Cleared Derivatives Transactions,” recent legislative and regulatory reforms have resulted in new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund’s ability to participate in derivatives transactions. Similarly, these changes could impose limits or restrictions on the counterparties with which the Fund engages in derivatives transactions. As a result, the Fund may be unable to use certain derivative instruments or otherwise execute its investment strategy. These risks may be particularly acute to the extent the Fund uses commodity-related derivative instruments. Options on Securities and Indexes. The Fund may, to the extent specified herein or in the Prospectus, purchase and sell both put and call options on equity, fixed income or other securities (including securities to be purchased when-issued, delayed delivery and forward commitment transactions) or indexes in standardized contracts traded on foreign or domestic securities exchanges, boards of trade, or similar entities, or quoted on the National Association of Securities Dealers Automated Quotations System (“NASDAQ”) or on an OTC market, and agreements, sometimes called cash puts, which may accompany the purchase of a new issue of bonds from a dealer. Among other reasons, the Fund may purchase put options to protect holdings in an underlying or related security against a decline in market value, and may purchase call options to protect against increases in the prices of securities it intends to purchase pending its ability to invest in such securities in an orderly manner. An option on a security (or index) is a contract that gives the holder of the option, in return for a premium, the right to buy from (in the case of a call) or sell to (in the case of a put) the writer of the option the security underlying the option (or the cash value of an option that is on an index or cash settled) at a specified exercise price often at any

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time during the term of the option for American options or only at