---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-291511"
form_type: "8-K"
ticker: "STEL"
cik: "0001473844"
company_name: "Stellar Bancorp, Inc."
filed_at: "2026-07-01T11:30:06+00:00"
generated_at: "2026-07-01T11:35:21.375061+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 1.0
calibrated_materiality_score: 1.0
confidence: "high"
source: SEC EDGAR
---

# Stellar Bancorp completes merger with Prosperity Bancshares; stock delisted

## Summary
- Merger closed July 1, 2026; each Stellar share converted to 0.3803 Prosperity shares plus $11.36 cash.
- Stellar directors and officers resigned; Robert R. Franklin, Jr. and Joseph B. Swinbank appointed to Prosperity board.
- Stellar sold approximately $466.4M of securities (agency MBS, CMBS, CMOs, municipals, corporate debt) as balance sheet repositioning.
- Stellar Common Stock delisted from NYSE; Prosperity intends to file Form 15 to deregister and suspend reporting.

## SEC filing metadata
- accession: 0001193125-26-291511
- form_type: 8-K
- ticker: STEL
- cik: 0001473844
- company_name: Stellar Bancorp, Inc.
- filed_at: 2026-07-01T11:30:06+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 1.0
- calibrated_materiality_score: 1.0
- confidence: high
- sec_items: 2.01, 3.01, 3.03, 5.01, 5.02, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1473844/000119312526291511/0001193125-26-291511-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1473844/000119312526291511/d116708d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-291511
- JSON: https://secwatch.observer/filing/0001193125-26-291511.json
- Plain text: https://secwatch.observer/filing/0001193125-26-291511.txt

## Key facts
- Executive change
  Robert R. Franklin, Jr. departed as Director at Stellar Bancorp, Inc..
  - Action: ceased serving
  - Role: Director
  source text: Stellar’s directors and executive officers ceased serving as directors and executive officers of Stellar.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1473844/000119312526291511/0001193125-26-291511-index.htm
- Executive change
  Joseph B. Swinbank departed as Director at Stellar Bancorp, Inc..
  - Action: ceased serving
  - Role: Director
  source text: Stellar’s directors and executive officers ceased serving as directors and executive officers of Stellar.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1473844/000119312526291511/0001193125-26-291511-index.htm

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