Third Coast Bancshares, Inc.: announces merger agreement with Great Plains

What happened

• Third Coast Bancshares, Inc. announced on Oct 7, 2026 that it and Great Plains Bancshares, Inc. executed a Merger Agreement. The filing says a press release announcing the Merger Agreement is furnished as Exhibit 99.1.
• The filing says Third Coast will provide supplemental information regarding the transactions. The filing also furnishes investor presentation slides and employee communications as exhibits.

Key details

• Parties and date: Third Coast Bancshares, Inc. and Great Plains Bancshares, Inc.; announcement dated Oct 7, 2026.
• Exhibits furnished: press release (Exhibit 99.1), investor presentation (Exhibit 99.2), Third Coast email to Third Coast Bank employees (Exhibit 99.3) and Great Plains email to Great Plains National Bank employees (Exhibit 99.4).
• Regulatory and procedural disclosures: the filing contains forward-looking statements and states Third Coast intends to file a registration statement on Form S-4 that will include a joint proxy statement/prospectus.
• Risks noted in the filing include the possibility that required regulatory, shareholder or other approvals may not be received or satisfied, integration and execution risks, potential dilution from issuance of additional shares and that the transaction may not close when expected or at all.

Why it may matter

• Item 7.01 (Regulation FD Disclosure) was used to furnish the press release; Item 8.01 (Other events) was used to furnish the investor slides and the written communications to employees. The filing describes forward-looking statements and lists factors that could cause actual results to differ materially from expectations. A filing does not show why the insider traded or why the company acted.