---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-416163"
form_type: "8-K"
ticker: "TCBX"
cik: "0001781730"
company_name: "Third Coast Bancshares, Inc."
filed_at: "2026-10-07T10:45:09+00:00"
generated_at: "2026-10-12T16:02:47.233342+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Third Coast to acquire Great Plains Bancshares in $239.6M all-stock deal; combined assets ~$9B

## Summary
- All-stock deal valued at approximately $239.6M based on TCBX's Oct 6, 2026 closing price; Third Coast expects to issue 5,570,352 shares.
- Pro forma ownership: ~78% Third Coast shareholders, ~22% Great Plains shareholders; combined company expected to have ~$9B in assets.
- Great Plains (founded 1907, HQ Oklahoma City) has 23 branches across Oklahoma and Texas and more than $1.9B in assets.
- Expected to close in Q1 2027, subject to regulatory approvals, Great Plains shareholder approval and Third Coast shareholder approval of the share issuance.
- Two Great Plains representatives will join the Third Coast and Third Coast Bank boards; Great Plains CEO Mark Russell stays in a leadership role, reporting to Third Coast CEO Bart Caraway.

## SEC filing metadata
- accession: 0001193125-26-416163
- form_type: 8-K
- ticker: TCBX
- cik: 0001781730
- company_name: Third Coast Bancshares, Inc.
- filed_at: 2026-10-07T10:45:09+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1781730/000119312526416163/0001193125-26-416163-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1781730/000119312526416163/d146780d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-416163
- JSON: https://secwatch.observer/filing/0001193125-26-416163.json
- Plain text: https://secwatch.observer/filing/0001193125-26-416163.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.