| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| DYKSTRA DAVID A | VICE CHAIRMAN AND COO | 9700 WEST HIGGINS ROAD, 8TH FLOOR, ROSEMONT | /s/Kathleen M. Boege, Attorney-in-fact | 28 Jan 2026 | 0001244276 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | WTFC | Common Stock | Tax liability | $244,154 | -1,670 | -0.86% | $146.20 | 193,410 | 26 Jan 2026 | Direct |