144/A 0001654954-26-005756 0001201821 XXXXXXXX LIVE 0000723188 COMMUNITY FINANCIAL SYSTEM, INC. 001-13695 333 Butternut Drive Syracuse, NY 13214 315 445 315 ERIC STICKELS DIRECTOR Common APEX CLEARING

350 N ST. PAUL ST SUITE 300 DALLAS TX 75201

2000 127180.00 52554929 06/08/2026 NYSE Common 06/08/2026 NA Community Financial System, Inc N 0 06/08/2026 NA Y 06/08/2026 /s/Eric Stickels