8-K filed November 6, 2025, 6:59 PM ET ticker CLST CIK 0001849867

other confidence high sentiment neutral materiality 0.15

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

Catalyst Bancorp, Inc.

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.

item 4.01 item 9.01

Machine-readable event card

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
discovered_at: 2026-05-14T18:02:40.805495+00:00
generated_at: 2026-05-16T23:59:32.754559+00:00
sec_items: ["4.01", "9.01"]
event_type: other
sentiment: neutral
materiality_score: 0.15
calibrated_materiality_score: 0.15
confidence: high
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Source-grounded claims

289a2e5c9b449bcf0cc87402f059e4bd82ba7776

HORNE LLP resigned as auditor of Catalyst Bancorp, Inc..

HORNE resigned as the Company’s independent registered public accounting firm on October 31, 2025.

SEC 8-K Item 4.01/4.02 confidence 0.9 SEC evidence

5605e57f79c7fc292a967d31d499570ffa48683d

Catalyst Bancorp, Inc. engaged BDO USA, P.C. as its auditor.

(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.

SEC 8-K Item 4.01/4.02 confidence 0.9 SEC evidence

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