X0306 4 2022-03-15 0000723188 COMMUNITY BANK SYSTEM, INC. CBU 0001220435 DAVIS JEFFREY L C/O COMMUNITY BANK SYSTEM, INC. 5790 WIDEWATERS PARKWAY DEWITT NY 13214 1 Phantom Stock (Deferred Stock Units) 2022-03-15 4 A 0 644 0 A Common Stock 644 3419.08 D Phantom Stock (Deferred Compensation under Merchants plan) Common Stock 58009.2253 58009.2253 D Phantom Stock (Deferred Compensation) Common Stock 4723.9076 4723.9076 D The reporting person has received deferred stock units under the Community Bank System, Inc. 2014 Long-Term Incentive Plan (the "Plan"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date. Includes 58.3671 units of phantom stock acquired as dividend equivalents under the Plan. The units of phantom stock were acquired through Merchants Bancshares, Inc.'s ("Merchants") deferred compensation plan. Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock. The units of phantom stock relating to such deferred compensation plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person. Includes 1,293.6875 units of phantom stock acquired under the Merchants' deferred compensation plan's dividend reinvestment feature Each unit of phantom stock is the economic equivalent of one share of Community Bank System, Inc. common stock. The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Bank System, Inc. common stock at future dates selected by the reporting person. Includes 24.5069 units of phantom stock acquired on January 10, 2022 under the Deferred Compensation Plan's dividend reinvestment feature. Danielle M. Cima, pursuant to a Confirming Statement executed by Jeffrey L. Davis 2022-03-17