8-K: Prosperity Bancshares to Acquire Stellar Bancorp

Prosperity Bancshares, Inc. announced a definitive merger agreement to acquire Stellar Bancorp, Inc. for approximately $2.002 billion, creating the second largest Texas-headquartered bank by assets.

Summary

• Prosperity Bancshares, Inc. (NYSE: PB) will acquire Stellar Bancorp, Inc. (NYSE: STEL) in a definitive merger agreement dated January 27, 2026.
• Stellar will merge into Prosperity, and Stellar Bank will merge into Prosperity Bank, with Prosperity continuing as the surviving entity.
• The total consideration for Stellar shareholders is approximately $2.002 billion, based on Prosperity's closing price of $72.90 on January 27, 2026.
• Each outstanding share of Stellar common stock will be exchanged for 0.3803 shares of Prosperity common stock and $11.36 in cash, representing approximately 70% stock and 30% cash consideration.
• As of December 31, 2025, Stellar reported total assets of $10.807 billion, total loans of $7.301 billion, and total deposits of $9.021 billion.
• The combined entity is projected to have $54 billion in assets, $33 billion in loans, and $42 billion in deposits at the estimated close on June 30, 2026.
• The merger is expected to be 9.2% accretive to Prosperity's 2027 estimated earnings per share (EPS) and result in a tangible book value (TBV) dilution of (7.8%) with an earnback period of approximately 4.5 years.
• Estimated cost savings are 35.0% of Stellar's non-interest expense, phased in at 25.0% in 2026 and 100% thereafter.
• One-time pre-tax transaction expenses are estimated at approximately $100.0 million.

Sentiment

Score: 9

Explanation: The filing presents a highly positive outlook on the merger, emphasizing significant strategic benefits, strong financial accretion to EPS, and enhanced market leadership. While there is expected tangible book value dilution, the earnback period is reasonable, and the overall tone and projected outcomes are very favorable for the combined entity.

Positives

• The merger creates the second largest bank by deposits headquartered in Texas with over 330 banking centers and $54 billion in assets.
• It significantly enhances Prosperity's presence in the Houston area, a market with a diverse economy and growing population, making the combined entity the #1 deposit franchise headquartered in Houston.
• The combined company will be the #1 bank in Beaumont by deposit share, bolstering its position in a key industrial region.
• The transaction is expected to be 9.2% accretive to Prosperity's 2027 estimated EPS.
• The pro forma company exhibits a strong deposit franchise with 34% noninterest-bearing deposits and a cost of deposits of 1.46%, both outperforming the KBW NASDAQ Regional Banking Index median.
• Stellar's management team will join Prosperity, bringing extensive banking experience and local market knowledge.

Negatives

• The transaction is expected to result in a (7.8%) dilution to tangible book value per share.
• One-time pre-tax transaction expenses are estimated at approximately $100.0 million.

Risks

• Cost savings and synergies from the proposed transaction may not be fully realized or may take longer than anticipated.
• Disruption to Prosperity's and Stellar's businesses may occur as a result of the announcements and pendency of the proposed transaction.
• Integration of Stellar's businesses and operations into Prosperity may be materially delayed, more costly or difficult than expected, or Prosperity may be unable to successfully integrate Stellar's business.
• Failure to obtain the necessary approval by the shareholders of Stellar.
• Inability to obtain required governmental approvals of the proposed transaction on the expected timeline, or at all, or such approvals may impose conditions that adversely affect Prosperity or the expected benefits.
• Reputational risk and the reaction of each company's customers, suppliers, employees, or other business partners to the proposed transaction.
• Failure of the closing conditions in the Merger Agreement to be satisfied, or any unexpected delay in closing or occurrence of events that could lead to termination of the Merger Agreement.
• Dilution caused by the issuance of additional shares of Prosperity's common stock in the proposed transaction.
• The proposed transaction may be more expensive to complete than anticipated due to unexpected factors or events.
• Outcome of any legal or regulatory proceedings that may be currently pending or later instituted against Prosperity or Stellar.
• Diversion of management's attention from ongoing business operations.
• General competitive, economic, political, and market conditions and other factors that may affect future results of Prosperity and Stellar.

Future Outlook

The merger is expected to close during the second quarter of 2026, subject to regulatory and shareholder approvals. Management anticipates significant cost savings of 35% of Stellar's non-interest expense, phased in over 2026 and 2027, leading to a 9.2% accretion to Prosperity's 2027 estimated EPS. The combined entity aims to leverage increased scale to invest in future opportunities and enhance customer service, solidifying its position as a leading Texas-headquartered bank.

Management Comments

• David Zalman, Senior Chairman and CEO of Prosperity, stated, "The combination of our companies will create the second largest bank by deposits headquartered in Texas with over 330 banking centers. Together, our increased scale better positions us to invest in future opportunities and serve our customers."
• Mr. Zalman also noted, "This is a rare opportunity to significantly enhance our presence in the Houston area, a market with a diverse economy that is continually attracting investment and has a growing population."
• Robert R. Franklin, Jr., CEO of Stellar and Executive Chairman of Stellar Bank, commented, "By joining forces, we are creating one of the strongest Texas banking franchises, supported by an exceptional deposit base and a shared commitment to relationship-driven community banking."
• Mr. Franklin added, "This combination enhances our ability to serve customers with greater scale, expanded capabilities, and the financial strength needed to meet the evolving needs of a growing Texas economy."

Industry Context

This acquisition significantly reshapes the Texas banking landscape, creating the second largest Texas-headquartered bank by assets and solidifying Prosperity's position as a dominant player in key metropolitan areas like Houston and Beaumont. The move reflects a trend of consolidation among regional banks seeking greater scale, operational efficiencies, and enhanced market penetration in growing economies like Texas. The combined entity's strong deposit franchise and complementary footprint position it well against larger national banks and other regional competitors.

Comparison to Industry Standards

• The pro forma company's noninterest-bearing deposits as a percentage of total deposits is 34%, which is significantly higher than the KBW NASDAQ Regional Banking Index (KRX) median of 25%.
• The pro forma cost of deposits is 1.46%, which is lower than the KRX median of 1.98%, indicating a more efficient funding structure.
• Prosperity has a strong track record of M&A, completing 31 transactions since 2000, contributing to a total shareholder return of +1,466% compared to the S&P 500's +668% and NASDAQ BANK's +182% over the same period, suggesting a successful integration strategy relative to peers.

Management Changes

Corporate Governance

Stakeholder Impact

• Shareholders of Stellar Bancorp, Inc. will receive a combination of Prosperity common stock and cash, providing them with liquidity and continued participation in the combined entity's future growth.
• Shareholders of Prosperity Bancshares, Inc. will experience tangible book value dilution but are expected to benefit from significant EPS accretion and enhanced market position.
• Employees of Stellar Bank will see certain management maintain leadership roles, but the broader impact on employee retention and potential redundancies due to integration is a consideration.
• Customers of both banks are expected to benefit from an expanded branch network, greater scale, and a broader range of financial products and services.
• The communities served by Stellar Bank, particularly in Houston and Beaumont, are expected to continue receiving financial products and community support from the larger, combined institution.

Next Steps

• Prosperity will file a Registration Statement on Form S-4 with the SEC to register the shares of Prosperity common stock to be issued.
• A Proxy Statement/Prospectus will be sent to Stellar's shareholders for approval of the proposed transaction.
• Obtain required regulatory approvals from governmental authorities.
• Satisfy other customary closing conditions outlined in the Merger Agreement.
• Integrate Stellar's businesses and operations into Prosperity, including the merger of Stellar Bank into Prosperity Bank.

Key Dates

Recommendation

The acquisition of Stellar Bancorp by Prosperity Bancshares is a strategically sound move that significantly enhances Prosperity's market leadership in Texas, particularly in the high-growth Houston and Beaumont MSAs. The projected 9.2% EPS accretion for 2027, coupled with substantial cost synergies and a strong pro forma deposit franchise, indicates a financially attractive transaction despite the initial tangible book value dilution. Prosperity's proven track record of successful M&A integrations further de-risks the execution. This merger positions the combined entity for robust future growth and operational efficiency, making it a compelling 'strong buy' for investors seeking exposure to a dominant regional banking franchise in a dynamic market.

Keywords

Merger, Acquisition, Banking, Regional Bank, Texas, Houston, Financial Services, Deposit Franchise, Bank Merger, Prosperity Bancshares, Stellar Bancorp