Results of Operations and Financial Condition. On July 28, 2026, Trustmark Corporation issued a press release announcing its financial results for the period ended June 30, 2026. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On April 28, 2026, Trustmark Corporation issued a press release announcing its financial results for the period ended March 31, 2026. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Chief Operating Officer — Thomas C. Owens: Mr. Owens was promoted to Chief Operating Officer of the Bank.

Results of Operations and Financial Condition. On January 27, 2026, Trustmark Corporation issued a press release announcing its financial results for the period ended December 31, 2025. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Other Events . Trustmark Corporation (the "Company") announced that, effective January 1, 2026, the Board of Directors has authorized a new stock repurchase program under which up to $100.0 million of its outstanding common shares may be acquired through December 31, 2026. The adoption of the Company’s share repurchase program follows the notification of the new share repurchase program by the Company to the Board of Governors of the Federal Reserve System. This authorization replaces the Com…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry Into a Material Definitive Agreement. On November 17, 2025, Trustmark Corporation (the “Company”) agreed to issue and sell (the “Offering”) $175,000,000 aggregate principal amount of its 6.00% Fixed-to-Floating Rate Subordinated Notes due 2035 (the “Notes”), pursuant to an Underwriting Agreement, dated as of November 17, 2025 (the “Underwriting Agreement”), with Keefe, Bruyette & Woods and Goldman Sachs & Co. LLC as underwriters. The Offering will be completed pursuant to the prospectus…

Results of Operations and Financial Condition. On October 28, 2025, Trustmark Corporation issued a press release announcing its financial results for the period ended September 30, 2025. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On July 22, 2025, Trustmark Corporation issued a press release announcing its financial results for the period ended June 30, 2025. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Other Events. On May 21, 2025, the United States District Court for the Western District of Tennessee entered an order (the “Court Order”) terminating the Consent Order (the “Consent Order”) entered into by the U.S. Department of Justice (the “DoJ”) and the Consumer Financial Protection Bureau (the “CFPB”) with Trustmark National Bank (the “Bank”) on October 22, 2021, and dismissed the related civil action with prejudice. The Consent Order and related litigation arose from allegations that th…

Results of Operations and Financial Condition. On April 22, 2025, Trustmark Corporation issued a press release announcing its financial results for the period ended March 31, 2025. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On January 28, 2025, Trustmark Corporation issued a press release announcing its financial results for the period ended December 31, 2024. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Director — Lea B. Turnipseed: The filing discloses the appointment of a new director and the recommendation of her committee assignments, which is a routine board governance matter.

Other Events . Trustmark Corporation (the “Company”) today announced that, effective January 1, 2025, the Board of Directors has authorized a new stock repurchase program under which up to $100,000,000 of its outstanding common shares may be acquired through December 31, 2025. The adoption of the Company’s share repurchase program follows the notification of the new share repurchase program by the Company to the Board of Governors of the Federal Reserve System. This authorization replaces the…

Director — Lea B. Turnipseed: The filing discloses the appointment of a new independent director to the board, which is a routine governance event and not a departure of an existing executive.

Results of Operations and Financial Condition. On October 22, 2024, Trustmark Corporation issued a press release announcing its financial results for the period ended September 30, 2024. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

Results of Operations and Financial Condition. On July 23, 2024, Trustmark Corporation issued a press release announcing its financial results for the period ended June 30, 2024. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.

CEO — Duane A. Dewey: The filing discloses a contract extension for the sitting CEO, which is a compensatory arrangement rather than a departure, appointment, or board election.

Results of Operations and Financial Condition. On April 23, 2024, Trustmark Corporation issued a press release announcing its financial results for the period ended March 31, 2024. A copy of this press release and the accompanying financial statements and slide presentation are attached hereto as Exhibits 99.1 and 99.2 to this report and incorporated herein by reference.