KNFKnife River Corp
- Market cap
- $3.01B
- as of 2026-10-23
- Latest close
- $53.12
- as of 2026-10-23
- Sector
- Basic Materials
- as of 2026-10-24
- Industry
- Building Materials
- as of 2026-10-24
Cluster
No cluster in the last 90 days under the default rule (14d · ≥2 insiders · all roles).
Form 4 historysince 2023-11-13
| Insider | Traded | Filed | Type | Shares | Price | Value | Owned after | 10b5-1 plan | Filing |
|---|---|---|---|---|---|---|---|---|---|
| Fagg Karen B | Sep 30 | Oct 1 | A · derivative | 329.85 | $53.43 | $17,625 | 1,588.99 | No | Form 4 |
| Fagg Karen B | Jun 30 | Jul 1 | A · derivative | 197.48 | $89.25 | $17,625 | 1,259.14 | No | Form 4 |
| Carmona-Alvarez German | May 20 | May 21 | A | 2,040 | $0.00 | $0 | 9,025 | No | Form 4 |
| Chiodo Patricia | May 20 | May 21 | A | 2,040 | $0.00 | $0 | 5,553 | No | Form 4 |
| Fagg Karen B | May 20 | May 21 | A | 2,380 | $0.00 | $0 | 33,317 | No | Form 4 |
| Hill Thomas W. | May 20 | May 21 | A | 2,040 | $0.00 | $0 | 5,496 | No | Form 4 |
| Moss Patricia L | May 20 | May 21 | A | 2,040 | $0.00 | $0 | 31,874 | No | Form 4 |
| Sandbrook William J | May 20 | May 21 | A | 2,040 | $0.00 | $0 | 7,735 | No | Form 4 |
| Fagg Karen B | Mar 31 | Apr 1 | A · derivative | 221.68 | $79.51 | $17,626 | 1,061.66 | No | Form 4 |
| Gray Brian R.President & CEO | Mar 6 | Mar 9 | A | 20,955 | $0.00 | $0 | 84,747 | No | Form 4 |
| Hastings Trevor JVice President & COO | Mar 4 | Mar 5 | A | 6,130 | $0.00 | $0 | 46,760 | No | Form 4 |
| Ring Nathan WVice President & CFO | Mar 4 | Mar 5 | A | 5,211 | $0.00 | $0 | 30,530 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Mar 4 | Mar 5 | A | 4,611 | $0.00 | $0 | 44,312 | No | Form 4 |
| LaChapelle Sarah L.VP & Chief People Officer | Mar 4 | Mar 5 | A | 2,713 | $0.00 | $0 | 4,578 | No | Form 4 |
| Pladsen Glenn R.VP & Chief Excellence Officer | Mar 4 | Mar 5 | A | 2,950 | $0.00 | $0 | 22,094 | No | Form 4 |
| Kadrmas Marney L.VP & Chief Accounting Officer | Mar 4 | Mar 5 | A | 1,199 | $0.00 | $0 | 4,917 | No | Form 4 |
| Kadrmas Marney L.VP & Chief Accounting Officer | Feb 12 | Feb 17 | F | 1,232 | $81.74 | $100,704 | 3,718 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 12 | Feb 17 | F | 1,922 | $81.74 | $157,104 | 29,655 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 12 | Feb 17 | F | 4,336 | $81.74 | $354,425 | 25,319 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 12 | Feb 17 | F | 2,880 | $81.74 | $235,411 | 45,229 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 12 | Feb 17 | F | 4,599 | $81.74 | $375,922 | 40,630 | No | Form 4 |
| Gray Brian R.President & CEO | Feb 12 | Feb 17 | F | 10,072 | $81.74 | $823,285 | 83,364 | No | Form 4 |
| Gray Brian R.President & CEO | Feb 12 | Feb 17 | F | 19,572 | $81.74 | $1,599,815 | 63,792 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Feb 12 | Feb 17 | F | 8,648 | $81.74 | $706,888 | 39,701 | No | Form 4 |
| Pladsen Glenn R.VP & Chief Excellence Officer | Feb 12 | Feb 17 | F | 1,385 | $81.74 | $113,210 | 20,713 | No | Form 4 |
| Pladsen Glenn R.VP & Chief Excellence Officer | Feb 12 | Feb 17 | F | 1,569 | $81.74 | $128,250 | 19,144 | No | Form 4 |
| Carmona-Alvarez German | May 22, 2025 | May 27, 2025 | A | 1,551 | $0.00 | $0 | 6,985 | No | Form 4 |
| Chiodo Patricia | May 22, 2025 | May 27, 2025 | A | 1,551 | $0.00 | $0 | 3,513 | No | Form 4 |
| Fagg Karen B | May 22, 2025 | May 27, 2025 | A | 1,810 | $0.00 | $0 | 30,937 | No | Form 4 |
| Hill Thomas W. | May 22, 2025 | May 27, 2025 | A | 1,551 | $0.00 | $0 | 3,456 | No | Form 4 |
| Moss Patricia L | May 22, 2025 | May 27, 2025 | A | 1,551 | $0.00 | $0 | 29,834 | No | Form 4 |
| Sandbrook William J | May 22, 2025 | May 27, 2025 | A | 1,551 | $0.00 | $0 | 5,695 | No | Form 4 |
| Gray Brian R.President & CEO | Feb 28, 2025 | Mar 3, 2025 | A | 12,599 | $0.00 | $0 | 93,436 | No | Form 4 |
| Christenson Nancy K.VP of Administration | Feb 27, 2025 | Mar 3, 2025 | F | 1,583 | $94.73 | $149,958 | 25,776 | No | Form 4 |
| Kadrmas Marney L.VP & Chief Accounting Officer | Feb 27, 2025 | Mar 3, 2025 | A | 709 | $0.00 | $0 | 4,950 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 27, 2025 | Mar 3, 2025 | A | 3,114 | $0.00 | $0 | 33,275 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 27, 2025 | Mar 3, 2025 | F | 1,698 | $94.73 | $160,852 | 31,577 | No | Form 4 |
| Pladsen Glenn R.VP & Chief Excellence Officer | Feb 27, 2025 | Mar 3, 2025 | A | 1,786 | $0.00 | $0 | 23,390 | No | Form 4 |
| Pladsen Glenn R.VP & Chief Excellence Officer | Feb 27, 2025 | Mar 3, 2025 | F | 1,292 | $94.73 | $122,391 | 22,098 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Feb 27, 2025 | Mar 3, 2025 | A | 2,770 | $0.00 | $0 | 55,432 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Feb 27, 2025 | Mar 3, 2025 | F | 7,083 | $94.73 | $670,973 | 48,349 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 27, 2025 | Mar 3, 2025 | A | 3,114 | $0.00 | $0 | 52,125 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 27, 2025 | Mar 3, 2025 | F | 4,016 | $94.73 | $380,436 | 48,109 | No | Form 4 |
| Fagg Karen B | Dec 31, 2024 | Jan 2, 2025 | A · derivative | 173.77 | $101.43 | $17,625 | 839.98 | No | Form 4 |
| Fagg Karen B | Sep 30, 2024 | Oct 1, 2024 | A · derivative | 197.56 | $89.22 | $17,626 | 666.22 | No | Form 4 |
| Fagg Karen B | Jun 28, 2024 | Jun 28, 2024 | A · derivative | 250.07 | $70.48 | $17,625 | 468.66 | No | Form 4 |
| Chiodo Patricia | Jun 27, 2024 | Jun 28, 2024 | A | 1,962 | $0.00 | $0 | 1,962 | No | Form 4 |
| Carmona-Alvarez German | May 15, 2024 | May 16, 2024 | A | 1,905 | $0.00 | $0 | 4,714 | No | Form 4 |
| Carmona-Alvarez German | May 15, 2024 | May 16, 2024 | A | 720 | $77.19 | $55,577 | 5,434 | No | Form 4 |
| Fagg Karen B | May 15, 2024 | May 16, 2024 | A | 2,222 | $0.00 | $0 | 28,286 | No | Form 4 |
| Fagg Karen B | May 15, 2024 | May 16, 2024 | A | 841 | $77.19 | $64,917 | 29,127 | No | Form 4 |
| Hill Thomas W. | May 15, 2024 | May 16, 2024 | A | 1,905 | $0.00 | $0 | 1,905 | No | Form 4 |
| Moss Patricia L | May 15, 2024 | May 16, 2024 | A | 1,905 | $0.00 | $0 | 27,563 | No | Form 4 |
| Moss Patricia L | May 15, 2024 | May 16, 2024 | A | 720 | $77.19 | $55,577 | 28,283 | No | Form 4 |
| Sandbrook William J | May 15, 2024 | May 16, 2024 | A | 1,905 | $0.00 | $0 | 3,424 | No | Form 4 |
| Sandbrook William J | May 15, 2024 | May 16, 2024 | A | 720 | $77.19 | $55,577 | 4,144 | No | Form 4 |
| Fagg Karen B | Mar 29, 2024 | Apr 1, 2024 | A · derivative | 218.59 | $80.63 | $17,625 | 218.59 | No | Form 4 |
| Gray Brian R.President & CEO | Feb 29, 2024 | Mar 4, 2024 | P | 1 | $73.65 | Purchase +$74 | 8,167.41 | No | Form 4 |
| Christenson Nancy K.VP of Administration | Feb 22, 2024 | Feb 26, 2024 | A | 2,153 | $0.00 | $0 | 28,739 | No | Form 4 |
| Christenson Nancy K.VP of Administration | Feb 22, 2024 | Feb 26, 2024 | F | 1,380 | $72.55 | $100,119 | 27,359 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 22, 2024 | Feb 26, 2024 | A | 4,805 | $0.00 | $0 | 52,290 | No | Form 4 |
| Hastings Trevor JVice President & COO | Feb 22, 2024 | Feb 26, 2024 | F | 3,280 | $72.55 | $237,964 | 49,010 | No | Form 4 |
| Gray Brian R.President & CEO | Feb 22, 2024 | Feb 26, 2024 | A | 17,769 | $0.00 | $0 | 80,837 | No | Form 4 |
| Kadrmas Marney L.Chief Accounting Officer | Feb 22, 2024 | Feb 26, 2024 | A | 1,050 | $0.00 | $0 | 4,241 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Feb 22, 2024 | Feb 26, 2024 | A | 4,348 | $0.00 | $0 | 57,904 | No | Form 4 |
| Liepitz Karl AVP, Chief Legal Officer & Sec. | Feb 22, 2024 | Feb 26, 2024 | F | 5,243 | $72.55 | $380,380 | 52,661 | No | Form 4 |
| Pladsen Glenn R.VP of Support Services | Feb 22, 2024 | Feb 26, 2024 | A | 2,153 | $0.00 | $0 | 22,545 | No | Form 4 |
| Pladsen Glenn R.VP of Support Services | Feb 22, 2024 | Feb 26, 2024 | F | 941 | $72.55 | $68,270 | 21,604 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 22, 2024 | Feb 26, 2024 | A | 4,805 | $0.00 | $0 | 31,668 | No | Form 4 |
| Ring Nathan WVice President & CFO | Feb 22, 2024 | Feb 26, 2024 | F | 1,508 | $72.55 | $109,405 | 30,160 | No | Form 4 |
| Carmona-Alvarez German | Nov 15, 2023 | Nov 16, 2023 | A | 2,605 | $57.57 | $149,970 | 2,809 | No | Form 4 |
| Everist Thomas S | Nov 15, 2023 | Nov 16, 2023 | A | 2,605 | $57.57 | $149,970 | 30,260 | No | Form 4 |
| Fagg Karen B | Nov 15, 2023 | Nov 16, 2023 | A | 2,858 | $57.57 | $164,535 | 26,064 | No | Form 4 |
| Moss Patricia L | Nov 15, 2023 | Nov 16, 2023 | A | 2,605 | $57.57 | $149,970 | 25,658 | No | Form 4 |
| Sandbrook William J | Nov 15, 2023 | Nov 16, 2023 | A | 1,519 | $57.57 | $87,449 | 1,519 | No | Form 4 |
| Mdu Resources Group Inc | Nov 10, 2023 | Nov 13, 2023 | J | 5,656,621 | $0.00 | $0 | not reported | No | Form 4 |