| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| STICKELS ERIC | Director | C/O COMMUNITY FINANCIAL SYSTEM, INC., 5790 WIDEWATERS PARKWAY, DEWITT | Danielle M. Cima, pursuant to a Confirming Statement executed by Eric E. Stickels | 05 Feb 2026 | 0001201821 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CBU | Common Stock | Sale | $129,492 | -2,000 | -5.7% | $64.75 | 33,342 | 03 Feb 2026 | Direct | F1 |
| holding | CBU | Common Stock | 14,908 | 03 Feb 2026 | By Wife's Community Financial System, Inc. 401(k) |
| Id | Content |
|---|---|
| F1 | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.60 to $64.805, inclusive. The reporting person undertakes to provide Community Financial System, Inc., any security holder of Community Financial System, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |