---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-251663"
form_type: "8-K"
ticker: "TCBX"
cik: "0001781730"
company_name: "Third Coast Bancshares, Inc."
filed_at: "2025-10-27T23:59:59+00:00"
generated_at: "2026-05-17T02:12:36.854901+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Third Coast Bancshares to acquire Keystone Bancshares for 0.45925 TCBX shares per Keystone share

## Summary
- Each Keystone share converts to 0.45925 TCBX shares; holders may elect cash subject to $20M aggregate cap.
- Deal requires Keystone to deliver at least $94.576M in adjusted capital (capital surplus minus intangibles).
- Keystone shareholders representing ~12% entered into voting agreement to support the merger.
- Transaction expected to close by September 30, 2026, pending regulatory and shareholder approvals.
- Termination fee of $4,820,128 payable by Keystone under certain circumstances, including alternative proposals.

## SEC filing metadata
- accession: 0001193125-25-251663
- form_type: 8-K
- ticker: TCBX
- cik: 0001781730
- company_name: Third Coast Bancshares, Inc.
- filed_at: 2025-10-27T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1781730/000119312525251663/0001193125-25-251663-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1781730/000119312525251663/tcbx-20251022.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-251663
- JSON: https://secwatch.observer/filing/0001193125-25-251663.json
- Plain text: https://secwatch.observer/filing/0001193125-25-251663.txt

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