0001068851 2026-07-01 2026-07-01 0001068851 true 8-K/A 2026-07-01 PROSPERITY BANCSHARES, INC. TX 001-35388 74-2331986 4295 San Felipe Houston TX 77027 (281) 269-7199 false false false false Common stock, par value $1.00 per share PB NYSE false Effective July 1, 2026, Prosperity Bancshares, Inc. (“Prosperity”) completed its acquisition of Stellar Bancorp, Inc., a Texas corporation (“Stellar”), pursuant to the Agreement and Plan of Merger (the “Merger Agreement”) dated as of January 27, 2026, by and between Prosperity and Stellar, as previously disclosed in Prosperity’s Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission (the “SEC”) on July 1, 2026 (the “Original Form 8-K”). Pursuant to the Merger Agreement, Stellar merged with and into Prosperity (the “Merger”), with Prosperity continuing as the surviving corporation in the Merger.This Current Report on Form 8-K/A (the “Amendment”) is being filed to amend and supplement the Original Form 8-K to include the financial statements of Stellar and the pro forma financial information required by Item 9.01 of Form 8-K. The pro forma financial information included in this Amendment has been presented for informational purposes only, as required by Form 8-K. It does not purport to represent the actual results of operations that Prosperity and Stellar would have achieved had the companies been combined during the period presented in the pro forma financial information and is not intended to project the future results of operations that the combined company may achieve after completion of the Merger. Except as described above, this Amendment does not otherwise amend, modify or update the disclosures contained in the Original Form 8-K and should be read in conjunction with the Original Form 8-K.