In a significant move in the banking sector, Prosperity Bancshares, Inc. has entered into a merger agreement with Southwest Bancshares, Inc. (SWBI), which was announced on September 30, 2025. The merger will see SWBI merged into Prosperity, with Prosperity serving as the surviving entity.
As part of the merger, SWBI shareholders will receive a combination of Prosperity common stock and an exchange ratio based on the number of shares outstanding at the time of closing. Specifically, all issued SWBI common stock will be converted into a total of 4,062,520 shares of Prosperity common stock, plus additional shares calculated at an exchange ratio of 0.6469 for any outstanding options or warrants. This arrangement is contingent upon SWBI meeting a minimum equity capital requirement of $188 million at the time of the merger.
The strategic rationale behind this merger centers on enhancing Prosperity's market footprint within Texas. By integrating SWBI's operations, including its wholly owned bank subsidiary Texas Partners Bank, into Prosperity Bank, the merger is expected to create operational efficiencies and broaden the customer base, thereby driving long-term growth and profitability.
The merger is contingent upon shareholder approval from SWBI's investors, which will be sought at a special meeting scheduled for [date pending confirmation], at Texas Partners Bank's headquarters in San Antonio, Texas. Both the SWBI Board of Directors and Prosperity's leadership have unanimously endorsed the merger, indicating their confidence in the deal's potential benefits.
In terms of market impact, the merger is poised to affect shareholders directly. Existing shareholders of Prosperity will see their ownership diluted slightly, with SWBI shareholders expected to hold approximately [percentage pending confirmation] of the combined entity post-merger. The deal is also anticipated to attract attention from industry analysts and investors as it may impact stock prices and valuations for both banks.
From a regulatory standpoint, the merger will require approval from relevant authorities, including antitrust reviews to ensure compliance with federal regulations. The transaction is expected to close as soon as all conditions are met and regulatory approvals are secured, with updates provided to shareholders throughout the process.
This merger represents a strategic alignment of two Texas-based institutions, aiming to strengthen their competitive positioning and deliver enhanced value to their respective shareholders.