| Filing Date | Insider | Type | 10b5-1 | Net Shares | Ownership change | Avg. Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-02-17 | KELLEY CHARLES M Director | Purchase | +5,000 | +164.96%8,031 | $20.84 | $104,225 | View SEC filing | |
| 2025-09-09 | Vollmer Jason L CFO | Purchase | +5,000 | +1.47%344,548.197 | $16.07 | $80,375 | View SEC filing | |
| 2025-08-19 | Vollmer Jason L CFO | Purchase | +5,000 | +1.49%339,548.197 | $16.27 | $81,375 | View SEC filing | |
| 2025-02-10 | JOHNSON DENNIS W Director | Purchase | +30,000 | +19.98%180,166 | $16.64 | $499,200 | View SEC filing | |
| 2024-05-08 | Johnson Rob L. President-WBI Holdings | Purchase | +36,291.0479 | +643.15%41,933.73 | $25.46 | $923,970 | View SEC filing | |
| 2024-03-13 | Rosenthal Dale Director | Purchase | +375 | +2.33%16,499 | $22.55 | $8,456 | View SEC filing | |
| 2021-06-15 | EVERIST THOMAS S Director | Sale | -17,795 | -3.10%556,526 | $33.04 | $587,876 | View SEC filing | |
| 2021-06-14 | Kivisto Nicole A President & CEO-Montana-Dakota | Sale | -7,410 | -11.89%54,907.398 | $33.26 | $246,449 | View SEC filing | |
| 2021-06-11 | EVERIST THOMAS S Director | Sale | -1 | -0.00%574,321 | $33.50 | $34 | View SEC filing | |
| 2021-06-09 | Kivisto Nicole A President & CEO-Montana-Dakota | Sale | -7,410 | -10.63%62,317.398 | $33.51 | $248,322 | View SEC filing | |
| 2021-06-09 | EVERIST THOMAS S Director | Sale | -50,000 | -8.01%574,322 | $33.51 | $1,675,700 | View SEC filing | |
| 2021-06-08 | EVERIST THOMAS S Director | Sale | -75,000 | -10.72%624,322 | $33.70 | $2,527,725 | View SEC filing | |
| 2021-06-07 | EVERIST THOMAS S Director | Sale | -70,678 | -9.18%699,322 | $33.97 | $2,400,967 | View SEC filing | |
| 2020-11-12 | Vollmer Jason L VP, CFO & Treasurer | Purchase | +1,000 | +10.06%10,938.12 | $24.93 | $24,925 | View SEC filing | |
| 2020-08-21 | SPARBY DAVID M Director | Purchase | +2,000 | +10.63%20,807 | $22.52 | $45,040 | View SEC filing | |
| 2020-05-18 | Link Margaret A VP and CIO | Purchase | +5,000 | +100.00%5,000 | $21.39 | $106,949 | View SEC filing | |
| 2020-05-18 | Barth Stephanie A VP, CAO & Controller | Purchase | +1,278 | +65.83%3,219.356 | $21.07 | $26,925 | View SEC filing | |
| 2020-05-15 | JOHNSON DENNIS W Director | Purchase | +5,000 | +5.01%104,752.067 | $18.80 | $93,975 | View SEC filing | |
| 2020-05-14 | Barney David C President & CEO-Knife River | Purchase | +1,500 | +4.05%38,563 | $19.95 | $29,925 | View SEC filing | |
| 2020-05-14 | SPARBY DAVID M Director | Purchase | +4,000 | +27.01%18,807 | $20.16 | $80,640 | View SEC filing | |
| 2020-05-14 | Vollmer Jason L VP, CFO & Treasurer | Purchase | +1,000 | +11.42%9,753.511 | $19.61 | $19,615 | View SEC filing | |
| 2020-05-13 | Goodin David L President & CEO | Purchase | +5,000 | +1.87%271,759.603 | $20.16 | $100,820 | View SEC filing | |
| 2020-03-10 | Vollmer Jason L VP, CFO & Treasurer | Purchase | +1,200 | +16.07%8,668.834 | $27.31 | $32,773 | View SEC filing | |
| 2019-05-31 | Ryan Edward A Director | Purchase | +3,500 | +32.74%14,190 | $24.81 | $86,820 | View SEC filing | |
| 2019-05-31 | Goodin David L Pres. and CEO-MDU Resources | Purchase | +5,000 | +1.99%256,289.603 | $24.45 | $122,234 | View SEC filing |
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