Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 10

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 10
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 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. Use of Proceeds Sales of the Common Shares, if any, under this Prospectus Supplement and the accompanying Prospectus may be made in negotiated transactions or transactions that are deemed to be “at the market” as defined in Rule 415 under the Securities Act, including sales made directly on the NYSE or sales made to or through a market maker other than on an exchange, at prices related to the prevailing market prices or at negotiated prices. There is no guarantee that there will be any sales of the Common Shares pursuant to this Prospectus Supplement and the accompanying Prospectus. Actual net proceeds the Fund receives from sales, if any, of the Common Shares under this Prospectus Supplement and the accompanying Prospectus may be more or less than the amount of net proceeds estimated in this Prospectus Supplement. In addition, the price per share of any such sale may be greater or less than the price set forth in this paragraph, depending on the market price of the Common Shares at the time of any such sale. Assuming the sale of Common Shares having an aggregate offering price of $1,000,000,000 under this Prospectus Supplement and the accompanying

S-6 Supplement | PIMCO Corporate & Income Opportunity Fund

Prospectus, at an assumed price of $13.72 per share for the Common Shares (last reported sale price per share of the Common Shares on the NYSE on April 30, 2025), the Fund estimates that the net proceeds of this offering will be approximately $989,255,548 after deducting an assumed sales load of 1.00% and the estimated offering expenses payable by the Fund. The net proceeds of this offering will be invested in accordance with the Fund’s investment objective and policies as set forth in the accompanying Prospectus. It is currently anticipated that the Fund will be able to invest substantially all of the net proceeds in accordance with its investment objective and policies within approximately 30 days of receipt by the Fund, depending on the amount and timing of proceeds available to the Fund as well as the availability of investments consistent with the Fund’s investment objective and policies, and except to the extent proceeds are held in cash to pay dividends or expenses or for temporary defensive purposes. Pending such investment, it is anticipated that the proceeds of this offering will be invested in high grade, short-term securities, credit-linked trust certificates, and/or high yield securities, index futures contracts