Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 154

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 154
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 charged on assets attributable to leverage obtained by the Fund other than through preferred shares. Please see “Principal Risks of the Fund - Leverage Risk” for additional information regarding leverage and related risks. The Fund’s ability to utilize leverage is also limited by asset coverage requirements and other guidelines imposed by rating agencies (currently Moody’s) that provide ratings for the ARPS, which may be more restrictive than the limitations imposed by the 1940 Act noted above. See “Description of Capital Structure” for more information. The Fund also may borrow money for temporary administrative purposes, to add leverage to the portfolio or for the settlement of securities transactions which otherwise might require untimely dispositions of portfolio securities held by the Fund. Effects of Leverage The following table is furnished in response to requirements of the SEC. It is designed to illustrate the effects of leverage through the use of senior securities, as that term is defined under Section 18 of the 1940 Act, on Common Share total return, assuming investment portfolio total returns (consisting of income and changes in the value of investments held in the Fund’s portfolio) of -10%, -5%, 0%, 5% and 10%. The table below assumes the Fund’s continued use of Preferred Shares averaged over the year ended June 30, 2023, representing approximately 9.88% of the Fund’s total average managed assets, and, although not senior securities under the 1940 Act, covered reverse repurchase agreements averaged over the year ended June 30, 2023, representing September 28, 2023 | Base Prospectus 57

PIMCO Corporate & Income Opportunity Fund

approximately 22.46% of the Fund’s total average managed assets. The table below also assumes that the Fund will pay dividends on Preferred Shares at an estimated annual effective Preferred Share dividend rate of 10.14% (based on the weighted average Preferred Share dividend rate during the year ended June 30, 2023) and interest on reverse repurchase agreements at an estimated annual effective interest expense rate of 3.55% (based on weighted average interest rate during the year ended June 30, 2023). Based on such estimates, the annual return that the Fund’s portfolio must experience (net of expenses) in order to cover such costs is 1.80%. The information below does not reflect the Fund’s use of certain other forms of economic leverage achieved through the use of other instruments or transactions not considered to be senior securities under the 1940 Act,