Company: PTY
Filing Date: 2025-09-25
Form Type: 40-17G
Source: 0001193125-25-217116
Chunk: 37

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-09-25
Form: 40-17G
Chunk 37
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 J06915000                 |     | Bond Period                  
 07-01-2025   to   07-01-2026 |     | Effective Date of Endorsement 
 July 1, 2025                  |
| Issued By                 
 Federal Insurance Company |     |                              |     |                               |

THIS ENDORSEMENT CHANGES THE BOND. PLEASE READ IT CAREFULLY. This endorsement modifies insurance provided under the following: FINANCIAL INSTITUTION BOND FOR INVESTMENT COMPANIES In consideration of the premium charged, it is agreed that solely with respect to coverage afforded under this Endorsement this Bond is amended as follows:

| (1) | Item 2., Single Loss Limits Of Liability – Deductible Amounts, of the Declarations is amended to 
 include the following:                                                                           |

| Insuring Clause    |     | Single Loss Limit of Liability |     | Deductible Amount |
| Stop Payment Order |     |                        $50,000 |     |            $5,000 |

| (2) | The following Insuring Clause is added: |

Stop Payment Order or Refusal to Pay Check Loss resulting directly from the Assuredbeing legally liable to pay compensatory damages for:

| a. | complying or failing to comply with notice from any Customer or any authorized representative of any                                                                
 Customer, to stop payment on any check or draft made or drawn upon or against the Assured by such Customer or by any authorized representative of such Customer; or |

| b. | refusing to pay any check or draft made or drawn upon or against the Assured by any Customer 
 or by any authorized representative of such Customer.                                        |

| (3) | The following Exclusions shall apply: |

This Bond does not cover loss resulting directly or indirectly from:

| a. | libel, slander, wrongful entry, eviction, defamation, false arrest, false imprisonment, malicious 
 prosecution, assault, or battery;                                                                 |

| b. | sickness, disease, physical bodily harm, mental or emotional distress or anguish, or death of any person; or |

| c. | discrimination. |

The title and any headings in this endorsement/rider are solely for convenience and form no part of the terms and conditions of coverage. All other terms, conditions and limitations of this Bond shall remain unchanged.

| Authorized Representative |

| PF-52917 (08/21) |     | Page 1 of 1 |

UNAUTHORIZED SIGNATURE ENDOR