| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Jensen Kirk D | General Counsel | PO BOX 30918, BILLINGS | /s/ Brian M. Murphy, Attorney-in-fact for Reporting Person | 18 Mar 2026 | 0001697127 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | FIBK | Common Stock | Tax liability | -1,375 | -4% | $33.22* | 32,731 | 16 Mar 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Number of shares of common stock withheld to satisfy the reporting person's tax withholding obligations upon vesting of a previously reported restricted stock unit award. |