Insider Transaction Report for Community Financial System, Inc.

This filing details a Form 4 filing for Michele Sullivan, a director at Community Financial System, Inc. (CBU). On June 18, 2026, Sullivan acquired 406.1888 units of Deferred Stock under the company's Long-Term Incentive Plan. These units, representing phantom stock, are economically equivalent to common stock and will be settled in shares at a future date. The acquisition price was $61.24 per share. Following this transaction, Sullivan holds 3959.8489 units of deferred stock. The filing also notes additional phantom stock units acquired as dividend equivalents under both the LTIP and the Directors' Deferred Compensation Plan.