Third Coast Bancshares, Inc. · NYSE:TCBX
Third Coast Bancshares — Merger or Acquisition (October 2026)
18 slides from Third Coast Bancshares's merger presentation, Oct 7, 2026
Slide 1: Strategic Partnership with Great Plains Bancshares, Inc.
Strategic Partnership with Great Plains Bancshares, Inc. Third Coast Bancshares, Inc. Investor Presentation October 7th, 2026
Slide 2: Disclaimer
DISCLAIMER FORWARD-LOOKING STATEMENTS This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties and are made pursuant to the safe harbor provisions of Section 27A of the Securities Act
Slide 3: Creating a Premier Southwestern Franchise
CREATING A PREMIER SOUTHWESTERN FRANCHISE Combined Financial Highlights(1) 35 Third Coast (20) 44 Great Plains (23) ~$9.0B ~$7.3B ~$7.8B 40 40 Assets Gross Loans HFI Deposits 27 44 35 9.0% 9.8% 11.5% 30 TCE/TA CET1 Ratio TRBC Ratio 20 20 ~1.3% ~15% ~56% 35 45 10 10 2027E ROAA(2) 2027E ROATCE(2) 2027
Slide 4: Overview of Great Plains Bancshares, Inc.
OVERVIEW OF GREAT PLAINS BANCSHARES, INC. Bank Level Financial Highlights 100+ year old community banking franchise 2023Y 2024Y 2025Y 2026Q1 2026Q2 Serving customers and communities in Western OK, OKC and North Balance Sheet ($mm) Texas Total Assets $ 1,602.1 $ 1,726.3 $ 1,850.0 $ 1,900.1 $ 1,929.0
Slide 5: Leading Deposit Share Across Great Plains' Legacy Markets
LEADING DEPOSIT SHARE ACROSS GREAT PLAINS’ LEGACY MARKETS Deposit Market Share — Legacy Oklahoma Counties(1) Oklahoma Market Highlights County (Great Plains Branch) Branches Rank Share Banks in Market • Record $13.7 billion of capital investment into Oklahoma through August 2025, including a $9 bill
Slide 6: Pro Forma Deposit Composition
PRO FORMA DEPOSIT COMPOSITION Third Coast Bancshares, Inc. Great Plains Bancshares, Inc. Pro Forma(1) 10% 11% 13% 11% 13% 19% 5% Key: 1% 9% DDA NOW & Other MMDA & Savings $5.9B 34% 26% $1.7B $7.6B 27% Retail Time Jumbo Time 40% 41% 40% Cost of Deposits: 3.04% Cost of Deposits: 2.34% Cost of Deposits
Slide 7: Transaction Terms & Structure
TRANSACTION TERMS & STRUCTURE • Merger sub to merge into Great Plains Bancshares, Inc.; Great Plains Bancshares, Inc. to merge into Third Coast Bancshares, Inc.; Great Plains National Transaction Bank to merge into Third Coast Bank Structure • 100% stock consideration • 5,570,352 shares of TCBX comm
Slide 8: Key Transaction Assumptions
KEY TRANSACTION ASSUMPTIONS • Third Coast Bancshares, Inc. 2026 and 2027 estimates per Consensus Estimates Earnings Projections • Great Plains Bancshares, Inc. 2026 and 2027 estimates per Great Plains Management • Cost savings of $17.1 million (estimated at 20.0% of Great Plains' 2027E non-interest
Slide 9: Financial Impact
FINANCIAL IMPACT EARNINGS & TANGIBLE BOOK VALUE PROFITABILITY(1) PROJECTED CAPITAL(2) ~14% ~1.3% 9.0% 2028 EPS Accretion 2027 ROAA TCE/TA ~(5%) ~15% 9.1% TBV Dilution 2027 ROATCE Leverage Ratio 2.5 Years ~4.1% 9.8% TBV Earnback 2027 NIM CET1 Ratio 25%+ ~56% 11.5% IRR 2027 EFFICIENCY RATIO Total Capi
Slide 10: Transaction Multiples vs Recent Bank Deals
TRANSACTION MULTIPLES VS RECENT BANK DEALS Median Bank M&A Transaction TCBX / Great Plains Multiples High Performing Targets(1) Price / Tangible Book Value(2) 1.56x 1.62x Price / LTM EPS 9.3x(3) 12.3x Price / LTM EPS + Cost Savings 6.1x(3) 8.2x Core Deposit Premium(4) 7.7% 9.3% Source: S&P Global. D
Slide 11: Profitability vs Pro Forma Peers
PROFITABILITY VS PRO FORMA PEERS 2027E ROAA (%)(1) 2027E ROATCE (%)(1) 1.9% 16% ~15% 15% 1.6% 14% 13% 13% 13% 13% 13% 1.4% Peer 13% ~1.3% 1.2% 1.1% 1.1% 1.2% 1.2% 1.2% 1.3% Median 11% Peer Median 8% 0.8% HTH SBSI BFST BUSE TCBX OBK EQBK Pro Forma SPFI BANF FFIN HTH OBK TCBX BFST SPFI BUSE SBSI BANF
Slide 12: Strategically Compelling Transaction
STRATEGICALLY COMPELLING TRANSACTION Combines two high performing banking franchises Attractive and granular deposit base Expands North Texas presence and enters Oklahoma markets Strategic and cultural fit Attractive financial impact and profitability enhancement Achievable cost savings and efficien
Slide 13: Appendix
APPENDIX © 2026 Third Coast Bancshares, Inc.
Slide 14: Continues Our Growth Mindset
CONTINUES OUR GROWTH MINDSET 2019 through 2026 Pro Forma (2026E for the KRX)(1) Asset Growth CAGR: ~38% (vs ~8% for the KRX)(1) Net Income Growth CAGR: ~76% (vs ~8% for the KRX)(1) NYSE & NYSE Texas, Securitizations $9,017 State Charter Acquisition of & New Keystone Branches Bancshares, Inc. $6,736
Slide 15: Due Diligence Process and Overview
DUE DILIGENCE PROCESS AND OVERVIEW Management conducted a comprehensive review of all key components of the Great Plains business Overview ➢ Management conducted diligence over a ~60-day period leading up to the announcement of the transaction, including on-site management meetings ➢ Extensive stres
Slide 16: Pro Forma Loan Composition
PRO FORMA LOAN COMPOSITION Third Coast Bancshares, Inc. Great Plains Bancshares, Inc. Pro Forma(1) 1% 2% 2% 12% 5% 16% 14% 15% Key: 18% Consumer & Other 4% 18% C&D C&I 23% Res. RE 11% $5.4B $1.7B $7.1B 19% OO CRE 11% NOO CRE 39% 8% Multifamily 44% 11% 17% 10% Yield on Loans Yield on Loans Yield on L
Slide 17: Additional Information
ADDITIONAL INFORMATION No Offer or Solicitation This communication is being made in respect of the proposed merger transaction involving Third Coast and Great Plains. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or the solicitation of
Slide 18: Third Coast Bancshares, Inc.
THIRD COAST BANCSHARES, INC. NYSE & NYSE Texas: TCBX Thank you. © 2026 Third Coast Bancshares, Inc.
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