425: Prosperity Bancshares to Acquire Stellar Bancorp

Prosperity Bancshares announced a definitive agreement to acquire Stellar Bancorp 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.
• The transaction is valued at approximately $2.002 billion, based on Prosperity's closing price of $72.90 on January 27, 2026.
• Stellar shareholders will receive 0.3803 shares of Prosperity common stock and $11.36 in cash for each outstanding Stellar common share, representing approximately 70% stock and 30% cash consideration.
• The merger will create the second largest bank by deposits headquartered in Texas, with over 330 banking centers and pro forma assets of $54 billion, loans of $33 billion, and deposits of $42 billion.
• Stellar Bank, with 52 banking offices and $10.807 billion in total assets, $7.301 billion in total loans, and $9.021 billion in total deposits as of December 31, 2025, will merge into Prosperity Bank.
• The transaction is expected to close during the second quarter of 2026, subject to required regulatory approvals and approval by Stellar's shareholders.

Sentiment

Score: 8

Explanation: The announcement outlines a strategic acquisition with clear financial benefits, including significant EPS accretion and enhanced market positioning, despite some tangible book value dilution. The integration of experienced management and complementary footprints suggests a strong potential for successful execution and long-term value creation.

Positives

• Creates the second largest Texas-headquartered bank by assets, significantly increasing scale and market presence.
• Bolsters Prosperity's position as a leading Houston bank, moving from 9th to 2nd in Houston MSA deposit rank (pro forma).
• Establishes a #1 bank position in Beaumont by deposit share (pro forma 36.8%).
• Projected to be 9.2% accretive to 2027 EPS for Prosperity.
• Anticipated cost savings estimated at 35.0% of Stellar's non-interest expense, phased in at 25.0% in 2026 and 100% thereafter.
• Integration of experienced Stellar management, including Robert R. Franklin, Jr. as Vice Chairman and Ramon Vitulli as Houston Area Chairman at Prosperity Bank.
• Stellar's strong deposit franchise, characterized by 38% non-interest-bearing deposits and a cost of deposits of 1.77% as of Q4 2025.
• The combined entity will have strong pro forma capital ratios, including a TCE / TA of 9.9%, Leverage Ratio of 10.0%, CET1 Ratio of 13.6%, and Total Capital Ratio of 14.6%.

Negatives

• Projected tangible book value (TBV) dilution of (7.8%).
• TBV earnback period estimated at approximately 4.5 years.
• Estimated one-time transaction expenses of approximately $100.0 million, pre-tax.

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 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 otherwise unsuccessful.
• 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, and the risk that such approvals may result in the imposition of adverse conditions.
• 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 any event 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 possibility that the proposed transaction may be more expensive to complete than anticipated.
• 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.

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 and synergies, leading to a projected 9.2% accretion to Prosperity's 2027 EPS, despite an estimated 7.8% tangible book value dilution with a ~4.5-year earnback period. The combined entity is projected to achieve a 1.58% ROAA and 17.1% ROATCE by 2027.

Management Comments

• "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." David Zalman, Senior Chairman and Chief Executive Officer of Prosperity.
• "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." David Zalman.
• "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." Robert R. Franklin, Jr., Chief Executive Officer of Stellar.
• "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." Robert R. Franklin, Jr.

Industry Context

This acquisition represents a significant consolidation within the Texas banking sector, creating a larger regional player. The combined entity will become the second largest Texas-headquartered bank by assets, enhancing its competitive position in key growth markets like Houston and Beaumont. The move aligns with a trend of regional banks seeking scale to better compete and invest in evolving financial services, particularly in dynamic economic regions. Stellar was noted as one of the few remaining Houston franchises with meaningful scale, indicating a strategic move to capture a significant market presence.

Comparison to Industry Standards

• The pro forma combined company's non-interest-bearing deposits (NIB Deposits / Total Deposits) are projected at 34%, which is higher than the KBW NASDAQ Regional Banking Index (KRX) median of 25%.
• The pro forma cost of deposits is projected at 1.36%, which is lower than the KRX median of 1.98%.
• Stellar Bancorp's individual NIB Deposits / Total Deposits was 38% and its cost of deposits was 1.77% as of Q4 2025, both favorable compared to the KRX median.
• The transaction multiples, such as Price / 2026 estimated EPS with synergies at 10.7x, suggest a reasonable valuation for a strategic acquisition in the regional banking sector, especially given the projected accretion and market positioning.

Management Changes

Corporate Governance

Stakeholder Impact

• Shareholders (Stellar): Will receive a mix of cash and Prosperity common stock, providing liquidity and continued equity participation in a larger, more diversified entity.
• Shareholders (Prosperity): Will experience dilution from the issuance of new shares but are expected to benefit from EPS accretion and enhanced market position in the long term.
• Employees (Stellar): Key management will retain leadership roles, and employment agreements have been signed with key personnel, suggesting efforts to retain talent. However, general integration risks include potential redundancies.
• Customers (Stellar & Prosperity): Will benefit from increased scale, expanded capabilities, and the financial strength of a larger institution, with a continued commitment to community banking.
• Communities: Prosperity has committed to serving the communities Stellar Bank serves with financial products and community support.

Next Steps

• Prosperity to file a Registration Statement on Form S-4 with the SEC.
• Stellar shareholders to receive a Proxy Statement/Prospectus and vote on the proposed transaction.
• Obtain required regulatory approvals from governmental authorities.
• Satisfy other customary closing conditions outlined in the Merger Agreement.
• Closing of the merger, expected during the second quarter of 2026.
• Stellar Bank to merge into Prosperity Bank immediately following the parent company merger.

Key Dates

Recommendation

The acquisition of Stellar Bancorp by Prosperity Bancshares is a highly strategic move that significantly enhances Prosperity's market presence in key Texas growth areas, particularly Houston and Beaumont. The projected 9.2% EPS accretion by 2027, coupled with substantial cost synergies, indicates a financially sound transaction. While there is an initial tangible book value dilution, the ~4.5-year earnback period is acceptable for a deal of this strategic magnitude. The combined entity's improved deposit franchise metrics (higher NIB deposits, lower cost of deposits) compared to industry benchmarks suggest a strong foundation for future profitability. The retention of key Stellar management also bodes well for a smoother integration and continued relationship-driven banking. This merger positions Prosperity for stronger long-term growth and competitive advantage in a dynamic market.

Keywords

Prosperity Bancshares, Stellar Bancorp, Merger, Acquisition, Banking, Texas, Houston, Beaumont, Financial Services, Regional Bank, Bank Merger, PB, STEL, SEC Filing