| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Hall Brenda M | Director | C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE | /s/ Danielle M. Cima, attorney-in-fact for Brenda M. Hall | 09 Mar 2026 | 0001891706 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | CBU | Common Stock | 39 | 01 Mar 2026 | Direct |