| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| DYKSTRA DAVID A | VICE CHAIRMAN AND COO | 9700 WEST HIGGINS ROAD, 8TH FLOOR, ROSEMONT | /s/David A. Dykstra | 27 Feb 2026 | 0001244276 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WTFC | Common Stock | Tax liability | $625,091 | -4,172 | -2.2% | $149.83 | 189,389 | 25 Feb 2026 | Direct |