TRUSTMARK CORP

Important Notice Regarding Internet Availability of Proxy Materials for the Annual Meeting of Shareholders to be held on Tuesday, April 23, 2024:

This proxy statement, a form of the proxy card and Trustmark’s 2023 Year in Review are available at investorrelations.trustmark.com. As permitted by rules adopted by the SEC, Trustmark is furnishing these proxy materials over the Internet to most shareholders. Those shareholders will not receive printed copies of these documents and instead will receive a Notice of Internet Availability containing instructions on how to access the proxy materials over the Internet. The Notice of Internet Availability also contains instructions on how each of those shareholders can request a printed copy of the proxy materials including this proxy statement, a proxy card and Trustmark’s 2023 Year in Review. Shareholders who do not receive a Notice of Internet Availability will receive a printed copy of the proxy materials by mail.