8-K: Third Coast to Acquire Keystone, Creating $6B Bank

Third Coast Bancshares, Inc. has entered into a definitive merger agreement to acquire Keystone Bancshares, Inc. in a stock and cash transaction valued at approximately $123 million, forming a combined entity with over $6 billion in assets.

Summary

• Third Coast Bancshares, Inc. (TCBX) has entered into a definitive merger agreement to acquire Keystone Bancshares, Inc. in a stock and cash transaction.
• The transaction is valued at approximately $123 million, based on Third Coast's closing stock price of $39.17 as of October 21, 2025, and assuming $20 million in aggregate cash consideration.
• The combined company will operate under the Third Coast name and brand, with pro forma total assets expected to exceed $6 billion.
• Keystone shareholders will receive either 0.45925 shares of Third Coast common stock or a cash equivalent, with the aggregate cash consideration capped at $20 million.
• The merger aims to strengthen Third Coast's presence in the rapidly growing greater Austin market, complementing its existing Texas branch network.
• Keystone Bank, headquartered in Austin, Texas, operates two branches in Austin, one in Ballinger, Texas, and one loan production office in Bastrop, Texas.
• Keystone Bank reported $1.02 billion in total assets with over 80 employees as of June 30, 2025.
• The transaction is expected to close during the first quarter of 2026, subject to customary closing conditions, including regulatory and shareholder approvals.
• The deal value represents 123% of Tangible Book Value Per Share (TBVPS) and 11.6x estimated 2026 Net Income (10.7x 2027 Net Income, or 7.5x with cost savings).
• The merger is expected to deliver EPS accretion in year one with a strong Internal Rate of Return (IRR) and an approximate 1.5-year earn-back for Tangible Book Value (TBV) dilution.
• Estimated cost savings are 25% of Keystone's non-interest expense, with 75% expected to be realized in 2026 and 100% ($6.3 million) fully phased in by 2027.

Sentiment

Score: 8

Explanation: The merger is presented with strong positive language from both management teams, highlighting strategic benefits, financial accretion, and cultural alignment. While standard M&A risks are disclosed, the overall tone is highly optimistic about growth and value creation for the combined entity.

Positives

• The merger creates a combined $6 billion bank operation, significantly enhancing scale and market presence.
• It strengthens Third Coast's position in the rapidly growing Austin market, adding valuable geographic diversification to its Texas branch network.
• The transaction is expected to deliver EPS accretion in year one with a strong Internal Rate of Return (IRR) and an approximate 1.5-year earn-back for Tangible Book Value (TBV) dilution.
• The partnership is expected to improve the pro forma deposit cost and composition for the combined entity.
• Both companies share a strong cultural alignment, emphasizing a client-first, relationship-driven approach, innovation, integrity, and service excellence.
• Keystone brings a high-quality credit profile with consistent asset quality, evidenced by average Net Charge-Offs (NCOs) to average loans less than 0.01% since inception.
• Keystone's granular low-cost deposits are expected to contribute to a consistent net interest margin through the rate cycle.
• Two Keystone directors, including current CEO Jeffrey Wilkinson, will join Third Coast's Board of Directors, ensuring leadership continuity and integration.
• Third Coast plans to retain all of Keystone's producers, maintaining key client relationships and expertise.

Negatives

• The transaction will cause dilution due to Third Coast's issuance of additional shares of its common stock.
• There is a possibility that the transaction may be more expensive to complete than anticipated due to unexpected factors or events.
• Reputational risk and potential adverse reactions from Third Coast's or Keystone's customers, suppliers, employees, or other business partners are possible.
• The merger may divert management's attention and time from ongoing business operations and opportunities.

Risks

• The occurrence of any event, change, or other circumstance that could give rise to the right of one or both parties to terminate the definitive merger agreement.
• The outcome of any legal proceedings that may be instituted against Third Coast or Keystone.
• The possibility that the transaction does not close when expected or at all because required regulatory, shareholder, or other approvals and conditions to closing are not received or satisfied on a timely basis or at all.
• The risk that required approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the transaction.
• The risk that the benefits from the transaction may not be fully realized or may take longer to realize than expected, including as a result of changes in general economic and market conditions, interest and exchange rates, monetary policy, laws and regulations, and competition.
• Disruption to the parties' businesses as a result of the announcement and pendency of the transaction.
• The risk that the integration of each party's operations will be materially delayed or will be more costly or difficult than expected, or that the parties are otherwise unable to successfully integrate their businesses.
• The possibility that the transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events.
• Reputational risk and potential adverse reactions of Third Coast's or Keystone's customers, suppliers, employees, or other business partners.
• Dilution caused by Third Coast's issuance of additional shares of its common stock in connection with the transaction.
• A material adverse change in the financial condition of Third Coast or Keystone.
• General competitive, economic, political, and market conditions.
• Major catastrophes such as earthquakes, floods, other natural or human disasters, including infectious disease outbreaks.
• The diversion of management's attention and time from ongoing business operations and opportunities on merger-related matters.
• Other factors that may affect future results, including changes in asset quality and credit risk, inability to sustain revenue and earnings growth, changes in interest rates and capital markets, inflation, customer borrowing, repayment, investment and deposit practices, technological changes, capital management activities, and legislative and regulatory actions.

Future Outlook

The transaction is expected to close in the first quarter of 2026, subject to regulatory and shareholder approvals. Management anticipates the merger will deliver EPS accretion in year one with a strong Internal Rate of Return (IRR) and a 1.5-year earn-back for Tangible Book Value (TBV) dilution. These financial benefits are projected to be driven by estimated cost savings of 25% of Keystone's non-interest expense, with 75% realized in 2026 and 100% ($6.3 million) fully phased in by 2027. The combined entity will operate under the Third Coast name and brand, aiming to enhance market presence and capabilities in the Texas market, particularly in Austin.

Management Comments

• Bart Caraway (Founder, Chairman, President, and CEO of Third Coast): "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. Keystone is a highly respected financial institution that shares our core values of exceptional customer service and building lasting relationships within the communities we serve. 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."
• Jeff Wilkinson (Founder, Chairman, and CEO of Keystone): "Our team is extremely excited to partner with Third Coast. We are united by a common vision, shared values, and a commitment to exceptional customer service, innovation and community focus. 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 Employee Email): "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 Employee Email): "This merger confirms the strength and continued growth potential of our market, which is a direct result of your hard work and dedication."
• Bart Caraway (Third Coast Employee Email): "Third Coast is financially strong, and this strategic partnership is set to amplify our footprint, which in turn benefits our customers, our employees, and the communities we care about."
• Bart Caraway (Third Coast Employee Email): "This merger confirms the strength and continued growth potential of Third Coast, which is the direct result of your hard work and dedication. I am beyond excited to continue this extraordinary journey with all of you."

Industry Context

This merger represents a strategic consolidation within the regional banking sector, particularly targeting the high-growth Texas market. By acquiring Keystone, Third Coast aims to significantly expand its footprint and market share in the Austin-Round Rock-San Marcos MSA, a region recognized for its rapid population and economic growth. This move allows Third Coast to enhance its competitive position against both larger national and regional banks, leveraging increased scale and geographic diversification. The emphasis on cultural alignment and relationship-driven banking reflects a broader industry trend where community banks seek to differentiate themselves through personalized service while also pursuing growth through strategic acquisitions to achieve operational efficiencies and broader market reach.

Comparison to Industry Standards

• The Austin market is highlighted as the #2 Fastest Growing Large Metro and #1 City in the U.S. for Entrepreneurs, indicating a highly attractive and competitive environment for banking expansion, aligning with industry focus on high-growth urban centers.
• Keystone's historical average Net Charge-Offs (NCOs) to average loans of less than 0.01% since inception suggests a strong credit profile and disciplined underwriting standards, potentially outperforming some industry averages for regional banks.
• The combined entity's pro forma total assets exceeding $6 billion positions it as a significant regional player in Texas, though it remains smaller than major competitors like JPMorgan Chase & Co. (17.5% Austin market share) or Texas Capital Bancshares Inc. (14.7% Austin market share).
• The deal valuation metrics (DV / TBVPS: 123%, DV / 2026E Net Income: 11.6x) can be benchmarked against recent regional bank M&A transactions to assess if the valuation is in line with industry norms for similar growth-oriented acquisitions, especially considering the expected EPS accretion and TBV earn-back period.

Management Changes

Corporate Governance

Legal Proceedings

• The outcome of any legal proceedings that may be instituted against Third Coast or Keystone is identified as a potential risk factor for the transaction.

Stakeholder Impact

• Shareholders (Third Coast): Expected long-term value creation, EPS accretion, and strategic market expansion, but also potential for dilution from stock issuance and risks related to transaction completion and integration challenges.
• Shareholders (Keystone): Opportunity to receive consideration in Third Coast common stock or cash, participating in the growth of a larger combined entity.
• Employees (Both Companies): New opportunities within a larger organization, retention of Keystone's producers, but also potential for disruption during integration; Town Hall meetings are scheduled to address concerns and ensure transparency.
• Customers (Both Companies): Expected benefits from premier banking solutions, cutting-edge technology, convenience, and community-oriented services; commitment to a seamless and uninterrupted banking experience during the transition.
• Communities: Amplified shared mission to uplift communities, fostering growth and positive change through an expanded banking presence and resources.

Next Steps

• Awaiting required regulatory approvals for the merger.
• Awaiting approval of Keystone and Third Coast shareholders for the merger agreement and stock issuance.
• Third Coast intends to file a registration statement on Form S-4 with the SEC, which will include a joint proxy statement/prospectus.
• A definitive joint proxy statement/prospectus will be sent to Keystone's and Third Coast's shareholders seeking required approvals.
• Scheduled Town Hall Teams Meetings for Third Coast employees on October 23, 2025, and for Keystone employees on October 27, 2025, to address questions.
• Establish a comprehensive implementation and conversion timeline once the transaction is legally finalized.
• Provide timely notifications to customers well in advance of any updates, with a likely transition by the second quarter of 2026.

Key Dates

Recommendation

The merger is strategically compelling, expanding Third Coast's presence in the high-growth Austin market and creating a larger, more diversified banking franchise with pro forma assets exceeding $6 billion. The transaction is expected to be accretive to EPS in year one with a strong Internal Rate of Return (IRR) and a manageable Tangible Book Value (TBV) earn-back period of 1.5 years, supported by significant cost synergies. The cultural alignment and retention of Keystone's key personnel suggest a smoother integration and continued focus on relationship banking. While standard M&A risks exist, the financial metrics and strategic rationale indicate a positive outlook for long-term shareholder value, making it an attractive investment.

Keywords

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