| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Vaccaro John A | Director | C/O COMMUNITY FINANCIAL SYSTEM, INC., 5790 WIDEWATERS PARKWAY, DEWITT | /s/ Danielle M. Cima, attorney-in-fact for John A. Vaccaro | 06 Oct 2025 | 0002090100 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | CBU | Common Stock | 175 | 01 Oct 2025 | Direct |