Form 3 Filing for Joe B. Swinbank

This filing is an initial report of securities ownership on Form 3 for Joe B. Swinbank, a director at PROSPERITY BANCSHARES INC. The filing indicates that no securities are beneficially owned by Mr. Swinbank as of July 1, 2026. An accompanying document, Exhibit 24, is a Limited Power of Attorney granted by Mr. Swinbank to Charlotte M. Rasche and Annette L. Tripp. This power of attorney authorizes them to execute and file Section 16 reports (Forms 3, 4, and 5) on his behalf with the Securities and Exchange Commission, including obtaining necessary electronic filing credentials. The power of attorney remains effective until Mr. Swinbank is no longer required to file such reports or until it is revoked in writing.