| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Jones Anne M | ChiefHRSafety&AdminOfficer | 1200 WEST CENTURY AVENUE, BISMARCK | Anthony D. Foti, Attorney-in-Fact for Anne M. Jones | 19 Feb 2026 | 0001662841 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MDU | Common Stock | Award | $0 | +5,523 | +4.4% | $0.000000 | 130,027 | 17 Feb 2026 | Direct | F1, F2 |
| transaction | MDU | Common Stock | Tax liability | $244,524 | -12,010 | -9.2% | $20.36 | 118,017 | 18 Feb 2026 | Direct | F2, F3, F4 |
| holding | MDU | Common Stock - 401(k) | 11,188 | 17 Feb 2026 | By Trustee |
| Id | Content |
|---|---|
| F1 | Represents restricted stock units (RSUs) that will vest on December 31, 2028, subject to the reporting person's continued employment through the vesting date. |
| F2 | Including 18,160 net shares, which vested on December 31, 2025. |
| F3 | Shares withheld in payment of tax liability in connection with the vesting of a previously reported award of RSUs, which vested December 31, 2025. |
| F4 | Price is equal to the closing price of a share of Common Stock on February 18, 2026. |