EXHIBIT 16.1

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April 2, 2025

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Securities and Exchange Commission

100 F Street, NE

Washington, D. C. 20549-7561

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Dear Sirs/Madams:

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We have read Item 4.01 of Catalyst Bancorp, Inc.’s Form 8-K/A dated April 2, 2025, and we agree with the statements concerning our firm contained therein.

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We have no basis to agree or disagree with any other matters reported therein.

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Respectfully,

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/s/ Castaing, Hussey & Lolan, LLC

New Iberia, Louisiana