Transaction Details

Footnotes

Includes 77.194, 66.44, and 72.7280 shares acquired on April 10, 2025, July 10, 2025, and October 10, 2025, respectively, pursuant to the Community Financial System, Inc. Dividend Reinvestment Plan. | 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 35.9672, 40.8617, and 45.1866 units of phantom stock acquired as dividend equivalents on April 10, 2025, 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 66.2494 and 75.0594 units of phantom stock acquired as dividend equivalents on July 10, 2025, and October 10, 2025, respectively, under the Deferred Compensation Plan.