Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 7

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 7
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 the Fund would bear, directly or indirectly, as a result of an offering. The table reflects the use of leverage attributable to the Fund's outstanding preferred shares and reverse repurchase agreements averaged over the fiscal year ended June 30, 2024 in an amount equal to 17.27% of the Fund's total average managed assets, including the assets attributable to such leverage (or 20.87% of the Fund's total average net assets attributable to Common Shares), and shows Fund expenses as a percentage of net assets attributable to Common Shares. The percentages above do not reflect the Fund’s use of other forms of economic leverage, such as credit default swaps or other derivative instruments. The table and example below are based on the Fund's capital structure as of June 30, 2024. The extent of the Fund’s assets attributable to leverage following an offering, and the Fund’s associated expenses, are likely to vary (perhaps significantly) from these assumptions.

Shareholder Transaction Expenses

| Sales load (as a percentage of offering price)                                     | 1.00%(1) |
| Offering Expenses Borne by Common Shareholders (as a percentage of offering price) | 0.05%    |
| Dividend Reinvestment Plan Fees                                                    | None(2)  |

(1) Represents the maximum commission with respect to the Common Shares being sold in this offering that the Fund may pay to JonesTrading in connection with sales of Common Shares effected by JonesTrading in this offering. This is the only sales load to be paid in connection with this offering. There is no guarantee that there will be any sales of Common Shares pursuant to this Prospectus Supplement and the accompanying Prospectus. Actual sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus, if any, may be less than as set forth in this table. In addition, the price per share of any such sale may be greater or less than the price set forth in this table, depending on the market price of the Common Shares at the time of any such sale. (2) You will pay brokerage charges if you direct your broker or the plan agent to sell your Common Shares that you acquired pursuant to a dividend reinvestment plan. You may also pay a pro rata share of brokerage commissions incurred in connection with open-market purchases pursuant to the Fund’s Dividend Reinvestment Plan. See “Dividend Reinvestment Plan” in the accompanying Prospectus.

June 6, 2025 | Supplement S-5

Annual Expenses

|                                         | Percentage ofNet Assets