Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 89

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 89
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 $1,000 investment in Common Shares of the Fund, assuming (1) that the Fund’s net assets do not increase or decrease, (2) that the Fund incurs total annual expenses of 3.70% of net assets attributable to Common Shares in years 1 through 10 (assuming assets attributable to reverse repurchase agreements representing 32.34% of Fund total managed assets) and (3) a 5% annual return (1) :

|                         | 1 Year | 3 Years | 5 Years | 10 Years |
| Total Expenses Incurred |    $37 |    $113 |    $191 |     $395 |

(1) The example above should not be considered a representation of future expenses. Actual expenses may be higher or lower than those shown. The example assumes that the estimated Interest Payments on Borrowed Funds, Dividend Cost on Preferred Shares, and Other Expenses set forth in the Annual Expenses table are accurate, that the rate listed under Total Annual Expenses remains the same each year and that all dividends and distributions are reinvested at NAV. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be greater or less than the hypothetical 5% annual return shown in the example. The example does not include commissions or estimated offering expenses, which would cause the expenses shown in the example to increase. In connection with an offering of Common Shares, the prospectus supplement will set forth an example including sales load and estimated offering costs.

28 Closed-End Funds | Base Prospectus

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PIMCO Corporate & Income Opportunity Fund

Financial Highlights The information in the table below for the fiscal year ended June 30, 2023, the fiscal period ended June 30, 2022 (1) , the fiscal years ended July 31, 2021, July 31, 2020 and July 31, 2019, the fiscal years ended July 31, 2018, July 31, 2017, July 31, 2016 and July 31, 2015 (2) , and the fiscal years ended November 30, 2014, November 30, 2013 and November 31, 2012 is derived from the Fund’s financial statements for the fiscal year ended June 30, 2023 audited by PricewaterhouseCoopers LLP (“PwC”), whose report on such financial statements is contained in the Fund’s June