第三海岸银行股份有限公司和大平原银行股份有限公司宣布合并协议

Third Coast expects to issue 5,570,352 shares of its common stock

operating primarily in the Greater Houston, Dallas-Fort Worth, and Austin-San Antonio markets through its wholly owned subsidiary, Third Coast Bank.

resulting in pro forma equity ownership of approximately 78% by Third Coast shareholders

Third Coast Bank conducts banking operations through 20 branches encompassing the four largest metropolitan areas in Texas.

Great Plains National Bank will merge into Third Coast Bank.

pursuant to which Third Coast will acquire Great Plains in an all-stock transaction

through its wholly owned subsidiary, Third Coast Bank.

Third Coast's Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the SEC on March 4, 2026

Third Coast's proxy statement for its 2026 Annual Meeting of Shareholders, as filed with the SEC on April 16, 2026

operates a 23-branch franchise across Oklahoma and Texas.

Great Plains will continue operating under the Great Plains brand as Great Plains Bank, a division of Third Coast Bank.

Headquartered in Oklahoma City, Oklahoma, Great Plains National Bank has served western Oklahoma and surrounding markets for more than 100 years

valued at approximately $239.6 million based on Third Coast's closing stock price as of October 6, 2026

operating a 23-branch franchise across Oklahoma and Texas.

On a pro forma basis, the combined company is expected to have approximately $9 billion in assets following the completion of the transaction.

in an all-stock transaction valued at approximately $239.6 million

is expected to close in the first quarter of 2027

Great Plains National Bank has served western Oklahoma and surrounding markets for more than 100 years and has expanded into the Oklahoma City metro and North Texas, operating a 23-branch franchise across Oklahoma and Texas.

operates a 23-branch franchise across Oklahoma and Texas

Third Coast will acquire Great Plains in an all-stock transaction