Prosperity Bancshares Inc. announced the completion of the merger of American Bank Holding Corp. with and into Prosperity and the merger of American's wholly owned subsidiary, American Bank N.A. , headquartered in Corpus Christi, Texas, with and into Prosperity Bank, all effective on Jan. 1, 2026.

Under the terms of the merger agreement between Prosperity and American, Prosperity issued 4,439,981 shares of Prosperity common stock to the former shareholders and award holders of American.

Stephen Raffaele, former Director and President of American and CEO and former President of American Bank, has joined Prosperity Bank as South Texas and San Antonio Area Chairman and Ben Wallace, former American Bank Chairman, has joined Prosperity Bank as South Texas Senior Chairman. Additional members of American Bank management will maintain leadership roles in the combined organization. In addition, Raffaele and Patt Hawn Wallace, former Chair of American and a former Director of American Bank, have joined the Board of Directors of Prosperity Bank.

American Bank operated 18 banking offices and two loan production offices in South and Central Texas including its main office in Corpus Christi, and banking offices in San Antonio, Austin, Victoria and the greater Corpus Christi area including Port Aransas and Rockport and a loan production office in Houston, Texas. American Bank banking locations will continue to operate under the American Bank name until the operational integration, which is scheduled for September 2026. At that time, American Bank customers may begin using any of Prosperity Bank's full service banking centers.