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Catalyst Bancorp, Inc.

CLST
Exchange
Nasdaq
Industry
Savings Institution, Federally Chartered
SEC CIK
0001849867

In the last 90 days, Catalyst Bancorp, Inc. insiders filed 1 open-market purchase and 0 sales; 23 institutions reported holding it in 13F filings for Q2 2026, worth $22.0M in total; no superinvestor holds it.

Holders of 5% or more of CLST

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Catalyst Bancorp, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of CLST
HolderLatest formStakeChangeFirst filedLatest filingFiling
Catalyst Bancorp, Inc. Employee Stock Ownership Plan13G/A10.20%416.8K shares+0.20 ppfrom 10.00%Feb 11, 20225 filingsFeb 13, 2026SEC
Stilwell Joseph13D/A9.00%364.1K shares+0.40 ppfrom 8.60%Oct 30, 20254 filingsAug 27, 2026SEC
Vanguard Capital Management LLC13G5.28%215.5K sharesNewApr 29, 20261 filingApr 29, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

18 Schedule 13D and 13G filings on Catalyst Bancorp, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on CLST
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 27, 20262:39 PM ETStilwell Josephand 5 others13D/A9.00%364.1K shares+0.40 ppfrom 8.60%Aug 27, 2026SEC
Apr 29, 20265:39 PM ETVanguard Capital Management LLC13G5.28%215.5K sharesNewMar 31, 2026SEC
Apr 13, 20267:15 PM ETStilwell Josephand 4 others13D/A8.60%348.6K shares+2.30 ppfrom 6.30%Apr 9, 2026SEC
Mar 26, 20264:43 PM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 13, 202610:40 AM ETCatalyst Bancorp, Inc. Employee Stock Ownership Plan13G/A10.20%416.8K shares+0.20 ppfrom 10.00%Dec 31, 2025SEC
Jan 12, 20265:26 PM ETStilwell Josephand 4 others13D/A6.30%260.0K shares+1.10 ppfrom 5.20%Jan 8, 2026SEC
Oct 30, 20257:13 PM ETStilwell Josephand 4 others13D5.20%216.0K sharesNewOct 23, 2025SEC
May 7, 202511:43 AM ETCatalyst Bancorp, Inc. Employee Stock Ownership Plan13G/A10.00%418.8K shares+0.20 ppfrom 9.80%Apr 30, 2025SEC
Feb 11, 20254:53 PM ETCatalyst Bancorp, Inc. Employee Stock Ownership Plan13G/A9.80%420.3K shares–Dec 31, 2024SEC
Nov 15, 20241:44 PM ETAlliancebernstein L.P.13G/A3.20%143.7K shares–Below 5%Sep 30, 2024SEC
Aug 14, 2024Mount Grey Capital LLC13G/AOld format–––SEC
Feb 14, 2024Catalyst Bancorp, Inc. Employee Stock Ownership Plan13G/AOld format–––SEC
Feb 14, 2024Mount Grey Capital LLC13G/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13GOld format–New–SEC
Feb 14, 2023Alliancebernstein L.P.13GOld format–New–SEC
Feb 10, 2023Mount Grey Capital LLC13G/AOld format–––SEC
Oct 4, 2022Mount Grey Capital LLC13GOld format–New–SEC
Feb 11, 2022Catalyst Bancorp, Inc. Employee Stock Ownership Plan13GOld format–New–SEC

Form 144: proposed insider sales

2 notices from officers, directors and other affiliates planning to sell Catalyst Bancorp, Inc. shares, newest first.

Form 144 notices for CLST
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Jun 10, 20269:44 AM ETKleiser Kirk E.Director6.00K$96.1KJun 10, 2026Charles Schwab Corp.SEC
Oct 28, 20259:48 AM ETKleiser Kirk E.Director4.75K$63.6KOct 28, 2025Charles Schwab & CoSEC