COMMUNITY FINANCIAL SYSTEM, INC.

Community Financial System, Inc. (the Company ) was incorporated on April 15, 1983, under the Delaware General Corporation Law. Its principal office is located at 333 Butternut Drive, Syracuse, New York 13214. The Company’s business philosophy is to operate as a diversified financial services enterprise providing a broad array of banking and other financial services to retail, commercial, institutional and governmental customers. The Company is a registered financial holding company which wholly-owns two significant subsidiaries: Community Bank, N.A. (the Bank or CBNA ), and Benefit Plans Administrative Services, Inc. ( BPAS ). As of December 31, 2025, BPAS owns five subsidiaries: Benefit Plans Administrative Services, LLC ( BPA ), a provider of defined contribution plan administration services; Northeast Retirement Services, LLC ( NRS ), a provider of institutional transfer agency, master recordkeeping services, fund administration, trust, and retirement plan services; BPAS Actuarial & Pension Services, LLC ( BPAS-APS ), a provider of actuarial and benefit consulting services; BPAS Trust Company of Puerto Rico, a provider of trust and benefit plan administration services; and Hand Benefits & Trust Company ( HB&T ), a provider of collective investment fund administration and institutional trust services. NRS owns one subsidiary, Global Trust Company, Inc. ( GTC ), a non-depository trust company which provides fiduciary services for collective investment trusts and other products. HB&T owns one subsidiary, Hand Securities, Inc. ( HSI ), an introducing broker-dealer.