Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 87

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 87
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 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)                                    | [--] |
| Offering Expenses Borne by Common Shareholders (as a percentage of offeringprice)(2) | [--] |
| Dividend Reinvestment Plan Fees(3)                                                   | None |

(1) In the event that the Common Shares to which this prospectus relates are sold to or through underwriters or dealer managers, a corresponding prospectus supplement will disclose the applicable sales load and/or commission. (2) The related supplement will disclose the estimated amount of offering expense, the offering price and the offering expenses borne by the Fund and indirectly by all of its Common Shareholders as a percentage of the offering price. (3) 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”. Annual Expenses

|                                        | Percentage of Net Assets Attributableto Common Shares (reflectingleverage attributable to ARPS and reverserepurchase agreements) |
| Management Fees(1)                     | 0.74%                                                                                                                            |
| Dividend Cost on Preferred Shares(2)   | 1.47%                                                                                                                            |
| Interest Payments on Borrowed Funds(3) | 1.45%                                                                                                                            |
| Other Expenses(4)                      | 0.04%                                                                                                                            |
| Total Annual Expenses(5)               | 3.70%                                                                                                                            |

(1) Management Fees include fees payable to the Investment Manager for advisory services and for supervisory, administrative and other services. The Fund pays for the advisory, supervisory and administrative services it requires under what is essentially an all-in fee structure (the “unified management fee”). Pursuant to an investment management agreement, PIMCO is paid a Management Fee of 0.65% based on the Fund’s average daily net assets (including daily net assets attributable to any Preferred Shares of the Fund that may be outstanding). The Fund (and not PIMCO) will be responsible for certain fees and expenses, which are reflected in the table above, that are not covered by the unified management fee under the investment management agreement. Please see