---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-246982"
form_type: "8-K"
ticker: "TCBX"
cik: "0001781730"
company_name: "Third Coast Bancshares, Inc."
filed_at: "2025-10-22T23:59:59+00:00"
generated_at: "2026-05-17T02:48:02.501395+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 Bancshares to acquire Keystone Bancshares for ~$123M in stock/cash

## Summary
- Transaction valued at ~$123M; Keystone shareholders elect 0.45925 TCBX shares or cash equivalent.
- Pro forma combined assets exceed $6B; Third Coast currently >$5B, Keystone >$1B.
- Expected to close in Q1 2026, subject to regulatory and shareholder approvals.
- Merger expands Third Coast's Austin presence; Keystone has two branches in Austin plus Ballinger and Bastrop.
- Combined company will operate under Third Coast name and brand.

## SEC filing metadata
- accession: 0001193125-25-246982
- form_type: 8-K
- ticker: TCBX
- cik: 0001781730
- company_name: Third Coast Bancshares, Inc.
- filed_at: 2025-10-22T23:59:59+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/1781730/000119312525246982/0001193125-25-246982-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1781730/000119312525246982/tcbx-20251022.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-246982
- JSON: https://secwatch.observer/filing/0001193125-25-246982.json
- Plain text: https://secwatch.observer/filing/0001193125-25-246982.txt

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