Catalyst Bancorp, Inc.

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SCHEDULE A - IDENTITY OF PARTICIPANTS

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SCHEDULE B - STILWELL ACTIVIST HISTORY

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SCHEDULE C - ITEM 2(E)

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SCHEDULE D - TRANSACTIONS IN SECURITIES

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NOMINEE AGREEMENT, DATED AUGUST 27, 2026, WITH MARK D. ALCOTT

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NOMINEE AGREEMENT, DATED AUGUST 27, 2026, WITH CORISSA B. PORCELLI

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OPTION AGREEMENT, DATED AUGUST 27, 2026, WITH MARK D. ALCOTT

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SALE PROPOSAL, DATED AUGUST 27, 2026

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AMENDED JOINT FILING AGREEMENT, DATED AUGUST 27, 2026

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POWER OF ATTORNEY, DATED AUGUST 27, 2026