News & Events

and Exhibit 99.1 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and such information shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Other Events. On February 2, 2026, Prosperity Bancshares, Inc. (“Prosperity”) issued a press release announcing the closing of the acquisition by Prosperity of Southwest Bancshares, Inc. (“Southwest”). Pursuant to the Agreement and Plan of Merger, dated as of September 30, 2025, by and between Prosperity and Southwest, Southwest merged with and into Prosperity, with Prosperity continuing as the surviving corporation (the “Merger”), and following the Merger, Texas Partners Bank, a Texas bankin…

Entry into a Material Definitive Agreement. Merger Agreement On January 27, 2026, Prosperity Bancshares, Inc., a Texas corporation (“Prosperity”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Stellar Bancorp, Inc., a Texas corporation (“Stellar”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Stellar will merge with and into Prosperity (the “Merger”), with Prosperity continuing as the surviving corporation in…

Other Events. Acquisition of Southwest Bancshares, Inc. On October 1, 2025, Prosperity issued a press release announcing that it had entered into a definitive merger agreement (the “Merger Agreement”) with Southwest Bancshares, Inc. (“Southwest”), a Texas corporation and bank holding company of Texas Partners Bank, a Texas banking association, pursuant to the terms and subject to conditions of which, Southwest will merge with and into Prosperity. On the terms and subject to the conditions of…