Community Financial System Inc 2025年度报告

☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscalyear endedDecember31,2025 Securities registered pursuant to Section12(b)of the Act: Securities registered pursuant to Section12(g)of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule405 of the Securities Act. Yes☒No☐. Indicate by check mark if the registrant is not required to file reports pursuant to Section13 or Section15(d)of the Act. Yes☐No☒. Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d)of the Securities Exchange Act of 1934 during the preceding12months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject to such filing requirements for the past 90days.Yes☒No☐. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of Regulation S-T(§232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrant was required to submit such files).Yes☒No☐. Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growthcompany. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the ExchangeAct. Large acceleratedfiler☒Non-accelerated filer☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financialaccounting standards provided pursuant to Section13(a)of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financialreporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect thecorrection of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of theregistrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Act). Yes☐No☒. The aggregate market value of the common stock, $1.00 par value per share, held by non-affiliates of the registrant computed by reference to the closing price as of the closeof business on June 30, 2025 (the last business day of the registrant’s most recently completed second fiscal quarter): $2,983,297,493. The number of shares of the common stock, $1.00 par value per share, outstanding as of the close of business on January31, 2026:52,723,931 DOCUMENTS INCORPORATED BY REFERENCE. Portions of the Definitive Proxy Statement for the Annual Meeting of the Shareholders to be held on May 20, 2026 (the “Proxy Statement”) are incorporated by reference inPart III of this Annual Report on Form10-K. TABLE OF CONTENTS PARTIPageItem1Business3Item1A Risk Factors18Item1B Unresolved Staff Comments30Item 1CCybersecurity30Item2Properties33Item3Legal Proceedings34Item4Mine Safety Disclosures34PARTIIItem5Market for the Registrant’s Common Equity, Related Stockholders Matters and Issuer Purchases of EquitySecurities34Item6[Reserved]37Item7Management’s Discussion and Analysis of Financial Condition and Results of Operations37Item7A Quantitative and Qualitative Disclosures about Market Risk75Item8Financial Statements and Supplementary Data:77Consolidated Statements of Condition78Consolidated Statements of Income79Consolidated Statements of Comprehensive Income80Consolidated Statements of Changes in Shareholders’ Equity81Consolidated Statements of Cash Flows82Notesto Consolidated Financial Statements83Report on Internal Control over Financial Reporting149Report of Independent Registered Public Accounting Firm150Item9Changes in and Disagreements with Accountants on Accounting and Financial Disclosure152Item9A Controls and Procedures152Item9B Other Information152Item9C Disclosure Regarding Foreign Jurisdictions that Prevent Inspections152PARTIIIItem10 Directors, Executive Officers and Corporate Governance153Item11 Executive Compensation153Item12 Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters153Item13 Certain Relationships and Related Transactions, and Director Independence153Item14 Principal Accounting Fees and Services153PARTIVItem15 Exhibits and Financial Statem