Company: PTY
Filing Date: 2025-09-25
Form Type: 40-17G
Source: 0001193125-25-217116
Chunk: 38

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-09-25
Form: 40-17G
Chunk 38
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SEMENT

| Named Assured             
 PIMCO FUNDS               |     |                              |     | Endorsement                   
 Number 8                      |
| Bond Number               
 J06915000                 |     | Bond Period                  
 07-01-2025   to   07-01-2026 |     | Effective Date of Endorsement 
 07-01-2025                    |
| 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 |
| Unauthorized Signature |     |                        $50,000 |     |            $5,000 |

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

Unauthorized Signature Loss resulting directly from the Assuredhaving accepted, paid, or cashed any check or Withdrawal Ordermade or drawn on or against the account of a Customer,which bears the signature or endorsement of one other than a person whose name and signature is on file with the Assuredas signatory on such account. As a condition precedent to coverage under this Insuring Clause, the Assuredshall have on file signatures of all persons who are signatories on such account. 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-52918 (08/21) |     | Page 1 of 1 |

Follow Form Excess

Bond Number 626-041080-9Issued To:

PIMCO Funds

July 1, 2025

To

July 1, 2026

### Crime &
Financial Institutions

Crum & Forster

305 Madison Avenue

PO Box 1973

Morristown, NJ 07960-1973

(973) 490-6600