---
schema_version: "secwatch.filing_event.v1"
accession: "0001849867-25-000022"
form_type: "8-K"
ticker: "CLST"
cik: "0001849867"
company_name: "Catalyst Bancorp, Inc."
filed_at: "2025-11-06T23:59:59+00:00"
generated_at: "2026-05-16T23:59:32.754559+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.15
calibrated_materiality_score: 0.15
confidence: "high"
source: SEC EDGAR
---

# Catalyst Bancorp replaces HORNE LLP with BDO USA as auditor after partner migration

## Summary
- HORNE LLP resigned Oct 31, 2025 after its partners and staff joined BDO USA, P.C.
- Audit Committee appointed BDO USA as independent auditor on Nov 5, 2025.
- No disagreements or reportable events occurred between HORNE and the company.
- HORNE concurred with the Company's statements in a letter filed as Exhibit 16.1.

## SEC filing metadata
- accession: 0001849867-25-000022
- form_type: 8-K
- ticker: CLST
- cik: 0001849867
- company_name: Catalyst Bancorp, Inc.
- filed_at: 2025-11-06T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.15
- calibrated_materiality_score: 0.15
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1849867/000184986725000022/0001849867-25-000022-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1849867/000184986725000022/clst-20251031x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001849867-25-000022
- JSON: https://secwatch.observer/filing/0001849867-25-000022.json
- Plain text: https://secwatch.observer/filing/0001849867-25-000022.txt

## Source-grounded claims
- claim_id: 289a2e5c9b449bcf0cc87402f059e4bd82ba7776
  claim: HORNE LLP resigned as auditor of Catalyst Bancorp, Inc..
  evidence_excerpt: HORNE resigned as the Company’s independent registered public accounting firm on October 31, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1849867/000184986725000022/0001849867-25-000022-index.htm
- claim_id: 5605e57f79c7fc292a967d31d499570ffa48683d
  claim: Catalyst Bancorp, Inc. engaged BDO USA, P.C. as its auditor.
  evidence_excerpt: (the “Company”), joined BDO USA, P.C. (“BDO”). As a result of this transaction, HORNE resigned as the Company’s independent registered public accounting firm on October 31, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1849867/000184986725000022/0001849867-25-000022-index.htm

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