| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| JOHNSON DENNIS W | Director | 1200 WEST CENTURY AVENUE, BISMARCK | Anthony D. Foti, Attorney-in-Fact for Dennis W. Johnson | 2025-11-14 | 0001195487 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MDU | Common Stock | Award | $0 | +7.78K | +4.32% | $0.00 | 188K | Nov 13, 2025 | Direct | |
| holding | MDU | Common Stock | 163 | Nov 13, 2025 | By Spouse |