425: Third Coast to Acquire Keystone in $123M Deal

Third Coast Bancshares, Inc. announced a definitive merger agreement to acquire Keystone Bancshares, Inc. for approximately $123 million, creating a combined entity with over $6 billion in assets.

Summary

• Third Coast Bancshares, Inc. (TCBX) will acquire Keystone Bancshares, Inc. (Keystone) in a definitive merger agreement.
• The transaction is valued at approximately $123 million, based on Third Coast's closing stock price of $39.17 on October 21, 2025.
• Keystone shareholders will receive either 0.45925 shares of Third Coast common stock or a cash equivalent, with aggregate cash consideration capped at $20 million.
• The deal values each Keystone common share at approximately $17.99.
• Upon completion, the combined company will operate under the Third Coast name and brand, with pro forma total assets exceeding $6 billion.
• The merger is expected to close during the first quarter of 2026, subject to regulatory and shareholder approvals.
• Keystone Bank, a Texas state savings bank, reported $1.02 billion in total assets as of June 30, 2025, with over 80 employees.

Sentiment

Score: 8

Explanation: The filing announces a strategic acquisition with clear financial benefits, including EPS accretion and strong IRR, despite initial TBV dilution. The expansion into a high-growth market like Austin and the cultural alignment are significant positives, indicating a well-planned and potentially successful integration. The risks are standard for M&A but well-articulated.

Positives

• Creates a premier Texas banking franchise with pro forma total assets exceeding $6 billion.
• Expands Third Coast's presence in the rapidly growing Austin market, complementing its existing Texas branch network.
• Expected to deliver EPS accretion of 7.0% in year one (2027) with high single-digit accretion thereafter.
• Achieves a strong Internal Rate of Return (IRR) of approximately 23%.
• Anticipates a Tangible Book Value (TBV) earn-back period of approximately 1.5 years.
• Enhances geographic diversification and improves pro forma deposit composition.
• Keystone brings a high-quality credit profile with average Net Charge-Offs (NCOs) / Average Loans less than 0.01% since inception.
• Identified cost savings of approximately 25% of Keystone's non-interest expense, totaling $6.3 million fully-phased in by 2027.
• Maintains strong pro forma capital ratios: TCE Ratio 8.3%, Leverage Ratio 8.9%, CET1 Ratio 9.3%, TRBC Ratio 12.3%.
• Cultural alignment and shared values between the two community banks are expected to facilitate integration.

Negatives

• The transaction is expected to result in a 2.6% dilution to Tangible Book Value (TBV) at closing.
• The pro forma cost of total deposits is estimated at 3.71%, which is higher than Third Coast's current 3.60% and Keystone's 3.09%.
• The exchange ratio is subject to a possible downward adjustment if Keystone's adjusted shareholders' equity is less than $94,576,000.
• Transaction costs are estimated at $13.0 million pre-tax.

Risks

• The transaction may not close when expected or at all due to failure to receive required regulatory, shareholder, or other approvals.
• Approvals may result in conditions that could adversely affect the combined company or the expected benefits.
• The anticipated benefits from the transaction may not be fully realized or may take longer to realize than expected.
• Disruption to the parties' businesses as a result of the announcement and pendency of the transaction.
• Integration of operations may be materially delayed, more costly, or more difficult than expected.
• The transaction may be more expensive to complete than anticipated due to unexpected factors or events.
• Reputational risk and potential adverse reactions from customers, suppliers, employees, or other business partners.
• Dilution caused by Third Coast's issuance of additional shares of its common stock.
• A material adverse change in the financial condition of Third Coast or Keystone.
• General competitive, economic, political, and market conditions.
• Major catastrophes such as natural disasters or infectious disease outbreaks.
• Diversion of management's attention and time from ongoing business operations.
• Changes in asset quality and credit risk, inability to sustain revenue and earnings growth, changes in interest rates and capital markets, inflation, customer practices, technological changes, and regulatory actions.
• The occurrence of any event, change, or circumstance that could give rise to the right of one or both parties to terminate the merger agreement.
• The outcome of any legal proceedings that may be instituted against Third Coast or Keystone.

Future Outlook

The combined entity, operating under the Third Coast name, is expected to achieve pro forma total assets exceeding $6 billion. The merger is projected to be 7.0% accretive to earnings per share in the first year (2027) with high single-digit accretion thereafter, and an Internal Rate of Return of approximately 23%. Management anticipates realizing 75% of estimated cost savings in 2026 and 100% ($6.3 million annually) by 2027. The transaction is expected to close in the first quarter of 2026, subject to regulatory and shareholder approvals, with a likely customer transition by the second quarter of 2026.

Management Comments

• "We are thrilled to join forces with Keystone – a partnership that aligns with our strategy to strengthen our presence in the greater Austin market, perfectly complementing our Texas branch network." Bart Caraway, Founder, Chairman, President and Chief Executive Officer of Third Coast.
• "Together, we will create significant benefits for our customers, driving innovation and operational excellence. We strongly believe this partnership will enhance our financial position, drive sustainable growth, and create long-term value for our shareholders." Bart Caraway, Third Coast CEO.
• "We are united by a common vision, shared values, and a commitment to exceptional customer service, innovation and community focus." Jeff Wilkinson, Founder, Chairman and Chief Executive Officer of Keystone.
• "By combining our resources and expertise, we are poised to deliver premier banking solutions, cutting-edge technology and convenience with a personal touch and community-oriented banking services, while fostering future growth throughout greater Austin." Jeff Wilkinson, Keystone CEO.
• "This strategic partnership is a commitment that makes both of our organizations stronger, which in turn creates new opportunities for our customers, our employees, and the communities we care about." Jeff Wilkinson, Keystone CEO.

Industry Context

This merger reflects a trend of consolidation within the regional banking sector, particularly in high-growth markets like Texas. The Austin-Round Rock-San Marcos MSA is highlighted as a rapidly expanding area, making strategic acquisitions to increase market share a key driver for growth-oriented banks. The focus on "community banking culture" and "relationship-driven client focus" suggests a strategy to compete by emphasizing personalized service, even as the combined entity grows significantly in size. The transaction aims to leverage the strengths of both institutions to create a larger, more diversified regional player in a competitive landscape.

Comparison to Industry Standards

• The deal value to tangible book value per share (DV/TBVPS) of 123% is a common metric in bank M&A, indicating a premium paid over tangible equity.
• The projected EPS accretion of 7.0% in year one and a TBV earn-back period of 1.5 years are generally considered favorable metrics for bank mergers, suggesting the deal is financially attractive and not overly dilutive in the long term.
• The estimated cost savings of 25% of Keystone's non-interest expense is a typical target for operational synergies in bank mergers, reflecting opportunities for efficiency gains.
• Keystone's "high-quality credit profile" with average NCOs / Avg Loans < 0.01% since inception suggests strong asset quality, which is a positive indicator for integration and risk management compared to industry averages that might see higher charge-off rates.
• The Austin market is consistently ranked highly for growth and economic vitality (e.g., #2 Fastest Growing Large Metro, #1 City in the U.S. for Entrepreneurs), positioning the combined entity in a prime location for sustained organic growth, potentially outperforming banks in stagnant markets.

Management Changes

Corporate Governance

Legal Proceedings

• The filing mentions "the outcome of any legal proceedings that may be instituted against Third Coast or Keystone" as a general risk factor, but does not disclose any specific ongoing or new legal proceedings.

Related Party Transactions

• No specific related party transactions are disclosed in the filing.

Stakeholder Impact

• Shareholders (Third Coast): Expected EPS accretion and long-term value creation, but initial TBV dilution. Will vote on stock issuance.
• Shareholders (Keystone): Will receive stock and/or cash consideration, subject to election and proration. Will vote on the merger.
• Employees (Third Coast & Keystone): Management emphasizes cultural alignment and new opportunities. Keystone producers will be retained. Town hall meetings scheduled for transparency.
• Customers (Third Coast & Keystone): Expected to benefit from premier banking solutions, cutting-edge technology, and expanded services. Transition expected by Q2 2026 with timely notifications.
• Communities: Enhanced community engagement and focus on "Building Relationships. Growing Communities. Doing Good."

Next Steps

• Receive required regulatory approvals.
• Obtain approval from Keystone's shareholders for the merger agreement.
• Obtain approval from Third Coast's shareholders for the issuance of Third Coast common stock.
• File a registration statement on Form S-4 with the SEC, including a joint proxy statement/prospectus.
• Establish a comprehensive implementation and conversion timeline after legal finalization.
• Conduct Town Hall Teams Meetings for employees of both Third Coast Bank (October 23rd) and Keystone Bank (October 27th).
• Likely customer transition by the second quarter of 2026.

Key Dates

Recommendation

The acquisition of Keystone Bancshares by Third Coast Bancshares is a strategically compelling move into the high-growth Austin market, which is a significant positive for long-term value creation. The projected 7.0% EPS accretion in the first year (2027) and a strong IRR of approximately 23% indicate favorable financial returns. While there is an initial 2.6% TBV dilution, the rapid 1.5-year earn-back period mitigates this concern. The cultural alignment and retention of Keystone's producers suggest a smoother integration and continued relationship-driven growth. The combined entity's increased scale to over $6 billion in assets enhances its competitive position in the dynamic Texas banking landscape. These factors, combined with the identified cost synergies, present a strong case for future performance.

Keywords

Bank Merger, Third Coast Bancshares, Keystone Bancshares, TCBX, Austin Market, Texas Banking, Financial Acquisition, Community Bank, Bank Holding Company, Merger Agreement, Financial Services, Regional Bank