SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
Jun. 30, 2026
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Catalyst Bancorp, Inc. (“Catalyst Bancorp” or the “Company”) is the holding company for Catalyst Bank (the “Bank”). The Bank has been in operation in the Acadiana region of south-central Louisiana since 1922 and offers commercial and retail banking products with a focus on fueling business and improving lives in the communities we serve. The Company was incorporated by the Bank in February 2021 as part of the conversion of the Bank from the mutual to the stock form of organization (the “Conversion”). The Conversion was completed on October 12, 2021. The Company was not engaged in operations and had not issued any shares of stock prior to the completion of the Conversion. As used in this report, unless the context otherwise requires, the terms “we,” “our,” “us,” or the “Company” refer to Catalyst Bancorp, and the term the “Bank” refers to Catalyst Bank, the wholly owned subsidiary of the Company. In addition, unless the context otherwise requires, references to the operations of the Company include the operations of the Bank. Basis of Presentation The accompanying unaudited consolidated financial statements of the Company were prepared in accordance with instructions for Form 10-Q and Regulation S-X and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations, comprehensive income, changes in equity and cash flows in conformity with accounting principles generally accepted in the United States of America (“GAAP”). In the opinion of management, all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the interim periods presented are not necessarily indicative of the results which may be expected for the entire fiscal year. These statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K. Certain amounts reported in prior periods may have been reclassified to conform to the current period presentation. Such reclassifications had no effect on previously reported equity or net income. Segment Reporting The Company determined that all of its banking operations serve a similar customer base, offer similar products and services, and are managed through similar processes. Therefore, the Company’s banking operations are aggregated into one reportable segment, which generates income principally from interest on loans and investment securities, as well as from fees charged in connection with various loan and deposit services. The chief operating decision maker (“CODM”) is the Chief Executive Officer, who for the purposes of assessing performance, making operating decisions, and allocating Company resources, regularly reviews net income as reported in the accompanying consolidated statements of income. The level of disaggregation and amounts of significant segment income and expenses, such as interest income, interest expense, provision for credit losses, salaries and employee benefits expense and other items, that are regularly provided to the CODM are the same as those presented in the accompanying consolidated statements of income. Likewise, the measure of segment assets is reported on the accompanying consolidated statements of financial condition as total assets. Use of Estimates Certain estimates involve significant judgments and uncertainties and could reflect materially different results under different assumptions and conditions. Methodologies the Company uses when developing estimates are included in its Annual Report on Form 10-K for the year ended December 31, 2025. Our accounting policy for the allowance for credit losses is the policy that management believes involves the most significant estimate to aid in fully understanding and evaluating our reported financial results. There were no material changes from the significant accounting policies or estimates previously disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In preparing the financial statements, the Company is required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the Company’s financial condition, results of operations, comprehensive income, changes in equity and cash flows for the interim periods presented. These adjustments are of a normal recurring nature and include appropriate estimated provisions. Recently Adopted Accounting Standards ASU No. 2025-08. In November 2025, the FASB issued ASU 2025-08, Financial Instruments – Credit Losses (Topic 326): Purchased Loans. This ASU expands the population of acquired financial assets subject to the gross-up approach in Topic 326. Under the guidance in this ASU, loans acquired without credit deterioration (“non-PCD loans”) and deemed “seasoned” are referred to as “purchased seasoned loans” and accounted for using the gross-up approach at acquisition. All non-PCD loans that are acquired in a business combination are deemed seasoned under the ASU. The gross-up approach results in recognizing loans at their purchase price plus an allowance for credit losses. Under previous guidance, the allowance for credit losses on non-PCD loans was recognized with a corresponding charge to earnings through the provision for credit losses at the acquisition date. ASU 2025-08 is effective for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years, with early adoption permitted. The guidance is required to be applied prospectively to loans that are acquired on or after the initial application date. The Company early adopted ASU 2025-08 beginning January 1, 2026. Since ASU 2025-08 only affects prospective loan acquisitions, there was no effect of adoption on the Company’s consolidated financial statements. Accounting Standards Updates Issued, but Not Adopted ASU No. 2024-03. In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this ASU require disclosure, in the notes to the financial statements, of specified qualitative and quantitative information about certain costs and expenses, such as employee compensation, depreciation, and intangible asset amortization. Disclosure requirements also include a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, among other items. The Company expects to adopt the amendments in ASU 2024-03 for periods beginning after December 31, 2026. As the update contains only amendments to disclosure requirements, adoption will have no impact on the Company’s consolidated financial condition or results of operations.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2026

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Catalyst Bancorp, Inc. (“Catalyst Bancorp” or the “Company”) is the holding company for Catalyst Bank (the “Bank”). The Bank has been in operation in the Acadiana region of south-central Louisiana since 1922 and offers commercial and retail banking products with a focus on fueling business and improving lives in the communities we serve. The Company was incorporated by the Bank in February 2021 as part of the conversion of the Bank from the mutual to the stock form of organization (the “Conversion”). The Conversion was completed on October 12, 2021. The Company was not engaged in operations and had not issued any shares of stock prior to the completion of the Conversion.

As used in this report, unless the context otherwise requires, the terms “we,” “our,” “us,” or the “Company” refer to Catalyst Bancorp, and the term the “Bank” refers to Catalyst Bank, the wholly owned subsidiary of the Company. In addition, unless the context otherwise requires, references to the operations of the Company include the operations of the Bank.

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Company were prepared in accordance with instructions for Form 10-Q and Regulation S-X and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations, comprehensive income, changes in equity and cash flows in conformity with accounting principles generally accepted in the United States of America (“GAAP”). In the opinion of management, all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the interim periods presented are not necessarily indicative of the results which may be expected for the entire fiscal year. These statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K.

Certain amounts reported in prior periods may have been reclassified to conform to the current period presentation. Such reclassifications had no effect on previously reported equity or net income.

Segment Reporting

The Company determined that all of its banking operations serve a similar customer base, offer similar products and services, and are managed through similar processes. Therefore, the Company’s banking operations are aggregated into one reportable segment, which generates income principally from interest on loans and investment securities, as well as from fees charged in connection with various loan and deposit services. The chief operating decision maker (“CODM”) is the Chief Executive Officer, who for the purposes of assessing performance, making operating decisions, and allocating Company resources, regularly reviews net income as reported in the accompanying consolidated statements of income. The level of disaggregation and amounts of significant segment income and expenses, such as interest income, interest expense, provision for credit losses, salaries and employee benefits expense and other items, that are regularly provided to the CODM are the same as those presented in the accompanying consolidated statements of income. Likewise, the measure of segment assets is reported on the accompanying consolidated statements of financial condition as total assets.

Use of Estimates

Certain estimates involve significant judgments and uncertainties and could reflect materially different results under different assumptions and conditions. Methodologies the Company uses when developing estimates are included in its Annual Report on Form 10-K for the year ended December 31, 2025. Our accounting policy for the allowance for credit losses is the policy that management believes involves the most significant estimate to aid in fully understanding and evaluating our reported financial results.

There were no material changes from the significant accounting policies or estimates previously disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In preparing the financial statements, the Company is required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the Company’s financial condition, results of operations, comprehensive income, changes in equity and cash flows for the interim periods presented. These adjustments are of a normal recurring nature and include appropriate estimated provisions.

Recently Adopted Accounting Standards

ASU No. 2025-08. In November 2025, the FASB issued ASU 2025-08, Financial Instruments – Credit Losses (Topic 326): Purchased Loans. This ASU expands the population of acquired financial assets subject to the gross-up approach in Topic 326. Under the guidance in this ASU, loans acquired without credit deterioration (“non-PCD loans”) and deemed “seasoned” are referred to as “purchased seasoned loans” and accounted for using the gross-up approach at acquisition. All non-PCD loans that are acquired in a business combination are deemed seasoned under the ASU. The gross-up approach results in recognizing loans at their purchase price plus an allowance for credit losses. Under previous guidance, the allowance for credit losses on non-PCD loans was recognized with a corresponding charge to earnings through the provision for credit losses at the acquisition date. ASU 2025-08 is effective for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years, with early adoption permitted. The guidance is required to be applied prospectively to loans that are acquired on or after the initial application date. The Company early adopted ASU 2025-08 beginning January 1, 2026. Since ASU 2025-08 only affects prospective loan acquisitions, there was no effect of adoption on the Company’s consolidated financial statements.

Accounting Standards Updates Issued, but Not Adopted

ASU No. 2024-03. In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this ASU require disclosure, in the notes to the financial statements, of specified qualitative and quantitative information about certain costs and expenses, such as employee compensation, depreciation, and intangible asset amortization. Disclosure requirements also include a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, among other items. The Company expects to adopt the amendments in ASU 2024-03 for periods beginning after December 31, 2026. As the update contains only amendments to disclosure requirements, adoption will have no impact on the Company’s consolidated financial condition or results of operations.