Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 402

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 402
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 access will be successful. There is also a risk that cyber security breaches may not be detected. The Fund and its shareholders could be negatively impacted as a result. Portfolio Turnover A change in the securities held by the Fund and reinvestment of the proceeds is known as “portfolio turnover.” PIMCO manages the Fund without regard generally to restrictions on portfolio turnover. Trading in fixed income securities does not generally involve the payment of brokerage commissions, but does involve indirect transaction costs. Trading in equity securities involves the payment of brokerage commissions, which are transaction costs paid by the Fund. The use of futures contracts may involve the payment of commissions to futures commission merchants. High portfolio turnover (e.g., greater than 100%) involves correspondingly greater expenses to the Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestments in other securities. The higher the rate of portfolio turnover of the Fund, the higher these transaction costs borne by the Fund generally will be. Such sales may result in realization of taxable capital gains (including short-term capital gains which are taxed when distributed to shareholders who are individuals at ordinary income tax rates). See “Taxation.” The portfolio turnover rate of the Fund is calculated by dividing (a) the lesser of purchases or sales of portfolio securities for the particular fiscal year by (b) the monthly average of the value of the portfolio securities owned by the Fund during the particular fiscal year. In calculating the rate of portfolio turnover, there is excluded from both (a) and

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(b) all derivatives and all securities, including options, whose maturities or expiration dates at the time of acquisition were one year or less. Proceeds from short sales and assets used to cover short positions undertaken are also excluded from both (a) and (b). For the fiscal year ended July 31, 2021, the Fund's portfolio turnover rate was 58%. For the period from August 1, 2021 to June 30, 2022, the Fund's portfolio turnover rate was 58%. For the fiscal year ended June 30, 2023, the Fund's portfolio turnover rate was 35%. Warrants to Purchase Securities The Fund may invest in or acquire warrants to purchase equity or fixed income securities. Warrants are instruments that give the holder the right, but not the obligation, to buy a security directly from an issuer at a specific price for a specific period of time. Changes in the value of a warrant do not necessarily correspond to changes in the value of its