Company: PTY
Filing Date: 2025-06-06
Form Type: 424B5
Source: 0001193125-25-137029
Chunk: 245

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-06-06
Form: 424B5
Chunk 245
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. The NAV of the Fund’s Common Shares will be reduced immediately following an offering by the sales load, commissions and offering expenses paid or reimbursed by the Fund in connection with such offering. The completion of an offering may result in an immediate dilution of the NAV per Common Share for all existing Common Shareholders. The following table sets forth, for each of the periods indicated, the high and low closing market prices of the Fund’s Common Shares on the NYSE, the high and low NAV per Common Share and the high and low premium/ discount to NAV per Common Share. See “Net Asset Value” for information as to how the Fund’s NAV is determined.

|                                 | Common sharemarket price(1) |        | Common sharenet asset value |        | Premium(discount) asa % of net assetvalue |        |
| Quarter                         |                        High |    Low |                        High |    Low | High                                      | Low    |
| Quarter ended June 30, 2023     |                      $14.00 | $12.40 |                      $10.99 | $10.75 | 29.03%                                    | 14.68% |
| Quarter ended March 31, 2023    |                      $14.37 | $12.01 |                      $11.55 | $10.83 | 25.28%                                    | 9.98%  |
| Quarter ended December 31, 2022 |                      $13.34 | $11.73 |                      $11.29 | $10.72 | 19.32%                                    | 8.86%  |

September 28, 2023 | Base Prospectus 95

PIMCO Corporate & Income Opportunity Fund

|                                  | Common sharemarket price(1) |        | Common sharenet asset value |        | Premium(discount) asa % of net assetvalue |        |
| Quarter                          |                        High |    Low |                        High |    Low | High                                      | Low    |
| Quarter ended September 30, 2022 |                      $14.42 | $11.50 |                      $11.83 | $10.89 | 22.72%                                    | 4.93%  |
| Quarter ended June 30, 2022      |                      $15.84 | $12.51 |                      $13.21 | $11.21 | 22.65%                                    | 9.48%  |
| Period ended March