Transaction Details

Footnotes

The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the "Plan"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date. | Includes 9.4706 and 10.4729 units of phantom stock acquired as dividend equivalents on July 10, 2025 and October 10, 2025, respectively, under the Plan. | Each unit of phantom stock is the economic equivalent of one share of Community Financial System, Inc. common stock. The units of phantom stock relating to the Deferred Compensation Plan will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person. | Includes 2.3840 and 5.6468 units of phantom stock acquired as dividend equivalents on July 10, 2025 and October 10, 2025, respectively, under the Deferred Compensation Plan.