Company: PTY
Filing Date: 2025-09-25
Form Type: 40-17G
Source: 0001193125-25-217116
Chunk: 31

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-09-25
Form: 40-17G
Chunk 31
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 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 |
| Fraudulent Transfer Instruction |     |                    $15,000,000 |     |          $250,000 |

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

| 14. | Fraudulent Transfer Instruction |

Loss resulting directly from the Assuredhaving, in good faith, transferred, paid, or delivered Moneyor Securitiesin reliance upon a Transfer Instructionthat purports, and reasonably appears, to have originated from:

| a. | the Customer; |

| b. | an Employee acting on instructions of such Customer; or |

| c. | a financial institution acting on behalf of such Customer with authority to make such instructions, |

but which Transfer Instructionwas, in fact, fraudulently issued without the knowledge of the Assured, Employee, or Customer. As a condition precedent to coverage under this Insuring Clause 14, the:

| i. | sender of the Transfer Instruction must have authenticated such Transfer Instruction with the 
 Customer’s authentication credentials or mechanism;                                           |

| ii. | Employee acting on the Transfer Instruction must obtain Verification prior to any                                                     
 single transfer, payment, or delivery of funds in excess of the Deductible Amount set forth in Paragraph (1) of this Endorsement; and |

| iii. | Assured shall assert any available claims, offsets, or defenses against such Customer, any 
 financial institution, or any other party to the transaction.                              |

| (3) | The Definition of Customer is deleted and replaced with the following: |

Customermeans any shareholder of an Assuredwhich has a written agreement with the Assuredto transfer such shareholder’s Moneyor Securitiesthrough a Voice Initiated Funds Transfer Instructionor a Transfer Instruction.

| PF-52913 (08/21) |     | Page 1 of 2 |

| (4) | The following Definitions are added: |

Telefacsimilemeans a system of transmitting a facsimile of a tangible document by electronic signals over telephone lines to a piece of equipment maintained for the specific purpose of receiving such signals and printing such facsimile on a tangible medium. Transfer Instructionmeans those instructions, other than any Voice Initiated Funds Transfer Instruction,