Company: PTY
Filing Date: 2025-09-25
Form Type: 40-17G
Source: 0001193125-25-217116
Chunk: 64

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-09-25
Form: 40-17G
Chunk 64
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| 471-801   |     | Page 1 of 1 |
| Ed. 02/13 |     |             |

RIDER NUMBER: 4 CO-SURETYRIDER To be attached to and made a part of Bond No. 64-MGU-25-A60830,issued to PIMCO Funds by U.S. Specialty Insurance Company. In consideration of the premium charged, it is agreed that, notwithstanding anything in this Bond

| 1. | The following DEFINITIONS are added to this Bond: |

| (a) | Company means all issuers of this Bond that are listed in the Schedule of Companies contained in Sub-Section 10. of the Co-Surety CONDITION. |

| (b) | Controlling Company means U.S. Specialty Insurance Company. |

| 2. | CONDITIONS is amended to include the following at the end thereof: |

Co-Surety

| 1. | Each Company shall be liable only for such proportion of any one loss under this Bond as the amount                                                                                                      
 underwritten by such Company, as specified in Sub-Section 10. of this Co-Surety CONDITION, bears to the Aggregate Limit of Liability of this Bond, but in no event shall any of said Companies be liable 
 for an amount greater than that underwritten by it.                                                                                                                                                      |

| 2. | This Co-Surety CONDITION is subject to CONDITION (C), Limits of 
 Liability.                                                      |

| 3. | In the absence of a request from any of said Companies to pay premiums directly to it, premiums for 
 this Bond may be paid to the Controlling Company for the account of all of said Companies.          |

| 4. | In the absence of a request from any of said Companies that notice of any loss and proof of loss be                                                                                                                                              
 given to or filed directly with it, the giving of such notice to and the filing of such proof with, the Controlling Company shall be deemed to be in compliance with the conditions of this Bond for the giving of notice of loss and the filing 
 of proof of loss, if given and filed in accordance with said conditions.                                                                                                                                                                         |

| 5. | The Controlling Company may give notice in accordance with the terms of this Bond, terminating or                                                                                                                                               
 canceling this Bond as an entirety or as to any employee insured thereunder, and any notice so given shall terminate or cancel the liability of all of said Companies as an entirety or as to such employee insured thereunder