Announced the signing of a definitive merger agreement to acquire Stellar Bancorp, Inc., headquartered in Houston, Texas
Net income of $139.9 million and earnings per share (diluted) of $1.49 for fourth quarter 2025
Net income of $542.8 million, increased 13.2%, and earnings per share (diluted) of $5.72, increased 13.3%, for the year ended December 31, 2025 compared with the same period 2024
Fourth quarter net interest margin increased 25 basis points to 3.30% compared to 3.05% for fourth quarter 2024
Deposits increased $700.4 million during fourth quarter 2025, or 10.1% annualized
Allowance for credit losses on loans and on off-balance sheet credit exposure of $371.4 million and allowance for credit losses on loans to total loans, excluding Warehouse Purchase Program, of 1.63%⁽¹⁾
Nonperforming assets remain low at 0.46% of fourth quarter average interest-earning assets
Return (annualized) on fourth quarter average assets of 1.49% and average tangible common equity of 13.61%⁽¹⁾
Completed the acquisition of American Bank Holding Corporation on January 1, 2026
Received all necessary regulatory and shareholder approvals for the pending acquisition of Southwest Bancshares, Inc., San Antonio, Texas
Repurchased 2.0 million shares of common stock for $137.2 million during fourth quarter 2025, and 2.3 million shares of common stock for $157.1 million during 2025
Approved 2026 Stock Repurchase Program covering up to 5% of outstanding common stock

HOUSTON, Jan. 28, 2026 /PRNewswire/ -- Prosperity Bancshares, Inc.^® (NYSE:PB) ("Prosperity Bancshares"), the parent company of Prosperity Bank^® (collectively, "Prosperity"), reported net income of $139.9 million for the quarter ended December 31, 2025, compared with $130.1 million for the same period in 2024. Net income per diluted common share was $1.49 for the quarter ended December 31, 2025, compared with $1.37 for the same period in 2024. The annualized return on fourth quarter average assets was 1.49%. Additionally, deposits increased $700.4 million during the fourth quarter of 2025. Nonperforming assets remain low at 0.46% of fourth quarter average interest-earning assets. On January 1, 2026, American Bank Holding Corporation ("American") merged with Prosperity Bancshares and American Bank, N.A. ("American Bank") merged with Prosperity Bank (collectively, the "Prosperity/American Merger").

"I am excited to announce that on January 1, 2026, Prosperity completed the merger with our new partner American and its wholly owned subsidiary American Bank, headquartered in Corpus Christi, Texas. In connection with that transaction, we are pleased that Patt Wallace, the daughter of one of the founding families of the bank, and Steve Rafaelle, the CEO of American Bank, have joined our Bank Board of Directors," said David Zalman, Prosperity's Senior Chairman and Chief Executive Officer.

"We have also received all regulatory and shareholder approvals for the merger with Southwest Bancshares, the parent company of Texas Partners Bank and expect the transaction will be effective on February 1, 2026. In connection with the Southwest deal, we are pleased that Gene Dawson, Interim Chairman of Southwest Bancshares and Chairman of the nationally recognized Pape-Dawson engineering firm will be joining our Bank Board of Directors. To further add to our San Antonio presence, Charlie Amato has joined our Bank Board of Directors. In addition to his successful business, Charlie previously served as a board member of Federal Reserve Board of Dallas, San Antonio Branch, a Regent of the Texas State University System and is an investor in the San Antonio Spurs," continued Zalman.

"When Prosperity went public in 1998, we were a small community bank in rural Texas with less than $500 million in assets. For 27 years, we have remained disciplined and focused on the same strategy. Delivering shareholder value by prioritizing low-cost core deposits, operational efficiency, sound credit quality, and growth via opportunistic M&A," added Zalman.

"This morning's announcement that Prosperity

PROSPERITY BANCSHARES, INC.® REPORTS FOURTH QUARTER 2025 EARNINGS