Transaction Details

Footnotes

Includes 67.928 shares acquired on January 12, 2026 pursuant to the Community Financial System, Inc. Dividend Reinvestment 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 ("DCP for Directors") will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person. | Includes 70.3453 units of phantom stock acquired on January 12, 2026 under the DCP for Directors' dividend reinvestment feature. | The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the "LTIP"). 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 41.4544 units of phantom stock acquired on January 12, 2026 as dividend equivalents under the LTIP.