Company: PTY
Filing Date: 2025-09-25
Form Type: 40-17G
Source: 0001193125-25-217116
Chunk: 1

Company: PIMCO CORPORATE & INCOME OPPORTUNITY FUND
Filing Date: 2025-09-25
Form: 40-17G
Chunk 1
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| Important Notice |

The SEC Requires Proof of Your Fidelity Insurance Policy Your company is now required to file an electronic copy of your fidelity insurance coverage (Chubb’s ICAP Bond policy) to the Securities and Exchange Commission (SEC), according to rules adopted by the SEC on June 12, 2006. Chubb is in the process of providing your agent/broker with an electronic copy of your insurance policy as well as instructions on how to submit this proof of fidelity insurance coverage to the SEC. You can expect to receive this information from your agent/broker shortly. The electronic copy of your policy is provided by Chubb solely as a convenience and does not affect the terms and conditions of coverage as set forth in the paper policy you receive by mail. The terms and conditions of the policy mailed to you, which are the same as those set forth in the electronic copy, constitute the entire agreement between your company and Chubb. If you have any questions, please contact your agent or broker.

| 14-02-12160 (08/19) |     | Page 1 of 1 |

| Important Notice |

IMPORTANT POLICYHOLDER INFORMATION Inquiries concerning your policy should be directed to your insurance agent. The name, address and telephone number of your agent, if one is involved, is shown on the policy and/or in the material accompanying the policy. If you require additional information you may contact the California Insurance Department at either the following address or phone number: California Insurance Department 300 South Spring Street Los Angeles, CA 90012 1-800-927-HELP

| 14-02-1495 (08/19) |     | Page 1 of 1 |

Notice of Loss Control Services Insuring Company: Federal Insurance Company As a Chubb policyholder, you have loss prevention information and/or services available to you, as listed in this Notice. You may order any brochure by email to formsordering@chubb.com and to view our full suite of loss prevention brochures/services go to www.chubb.com/us/fl-lossprevention Directors and Officers (D&O) Liability Loss Prevention Services

| • |     | Directors and Officers Liability Loss Prevention Manuals: |

Directors and Officers Liability Loss Preventions – #14-01-0035 Directors and Officers Securities Litigation Loss Preventions – #14-01-0448 Director Liability Loss Prevention in Mergers and Acquisitions – #14-01-1099 Directors and Officers Liability