HOUSTON, Feb. 2, 2026 /PRNewswire/ -- Prosperity Bancshares, Inc.® ("Prosperity") (NYSE: PB), the parent company of Prosperity Bank®, today announced the completion of the merger of Southwest Bancshares, Inc. ("Southwest") with and into Prosperity and the merger of Southwest's wholly owned subsidiary, Texas Partners Bank ("Texas Partners"), headquartered in San Antonio, Texas, with and into Prosperity Bank, all effective on February 1, 2026. Under the terms of the merger agreement between Prosperity and Southwest, Prosperity issued 4,095,397 shares of Prosperity common stock to the former shareholders and award holders of Southwest.