---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-232794"
form_type: "8-K"
ticker: "STEL"
cik: "0001473844"
company_name: "Stellar Bancorp, Inc."
filed_at: "2026-05-20T21:00:39+00:00"
generated_at: "2026-05-20T21:03:55.766460+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Stellar discloses three lawsuits and supplemental proxy disclosures for PB merger

## Summary
- Three shareholder lawsuits filed in NY Supreme Court challenging merger disclosure adequacy.
- Supplemental proxy includes details on talks with Company B, C, D from Sept–Nov 2025.
- KBW fee estimated at ~$23.8M; prior $500K from Prosperity for American Bank Holding deal.
- Stellar and Prosperity deny claims; supplemental disclosures made to avoid litigation delay.
- Proxy amended with selected transaction announcement dates and financial analysis ranges.

## SEC filing metadata
- accession: 0001193125-26-232794
- form_type: 8-K
- ticker: STEL
- cik: 0001473844
- company_name: Stellar Bancorp, Inc.
- filed_at: 2026-05-20T21:00:39+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1473844/000119312526232794/0001193125-26-232794-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1473844/000119312526232794/d227903d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-232794
- JSON: https://secwatch.observer/filing/0001193125-26-232794.json
- Plain text: https://secwatch.observer/filing/0001193125-26-232794.txt

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