---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-028154"
form_type: "8-K"
ticker: "PB"
cik: "0001068851"
company_name: "PROSPERITY BANCSHARES INC"
filed_at: "2026-01-29T23:59:59+00:00"
generated_at: "2026-05-16T06:16:13.272890+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Prosperity Bancshares to acquire Stellar Bancorp in stock+cash deal valued at $11.36 + 0.3803 shares per Stellar share

## Summary
- Each Stellar share exchanged for 0.3803 PB shares plus $11.36 cash; Stellar options and awards cancelled for cash.
- Stellar must pay $78M termination fee if deal breaks under certain circumstances.
- PB enters voting agreements with Stellar directors covering ~8.8% of Stellar shares, agreeing to vote for merger.
- Closing requires Stellar shareholder approval, regulatory nods (Fed, FDIC, Texas Dpt of Banking), and S-4 effectiveness.
- PB will add two Stellar directors to its board and Prosperity Bank board post-closing.

## SEC filing metadata
- accession: 0001193125-26-028154
- form_type: 8-K
- ticker: PB
- cik: 0001068851
- company_name: PROSPERITY BANCSHARES INC
- filed_at: 2026-01-29T23:59:59+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/1068851/000119312526028154/0001193125-26-028154-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1068851/000119312526028154/d89446d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-028154
- JSON: https://secwatch.observer/filing/0001193125-26-028154.json
- Plain text: https://secwatch.observer/filing/0001193125-26-028154.txt

## Key facts
- Material Agreements
  PROSPERITY BANCSHARES INC entered into Agreement and Plan of Merger with Stellar Bancorp, Inc. (effective 2026-01-27).
  - Action: entry
  - Agreement: merger
  - Counterparty: Stellar Bancorp, Inc.
  - Effective: 2026-01-27
  source text: On January 27, 2026, Prosperity Bancshares, Inc., a Texas corporation (“Prosperity”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Stellar Bancorp, Inc., a Texas corporation (“Stellar”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1068851/000119312526028154/0001193125-26-028154-index.htm

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