Mdu Resources's three largest insider shareholders as of September 29, 2026 are David L Goodin (President Ceo, 595.56K shares), Nicole A Kivisto (President Ceo, 547.96K shares), Jason L Vollmer (Cfo, 324.98K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | David L Goodin | President Ceo | 595,558 | 0 | 595,558 | 17.9% | 16 Feb, 2024 |
| 2 | Nicole A Kivisto | President Ceo | 547,962 | 0 | 547,962 | 16.5% | 19 Feb, 2026 |
| 3 | Jason L Vollmer | Cfo | 324,976 | 0 | 324,976 | 9.8% | 19 Feb, 2026 |
| 4 | Jeffrey S Thiede | President Ceo Mdu Csg | 269,169 | 0 | 269,169 | 8.1% | 16 Feb, 2024 |
| 5 | Dennis W Johnson | Director | 187,945 | 0 | 187,945 | 5.7% | 14 Nov, 2025 |
| 6 | David C Barney | Ceo Knife River | 132,769 | 0 | 132,769 | 4.0% | 21 Feb, 2023 |
| 7 | Anne M Jones | Chiefhrsafetyadminofficer | 118,017 | 10,624 | 128,641 | 3.9% | 19 Feb, 2026 |
| 8 | Rob L. Johnson | President Wbi | 82,665 | 41,934 | 124,599 | 3.8% | 19 Feb, 2026 |
| 9 | Thomas S Everist | Director | 110,626 | 0 | 110,626 | 3.3% | 22 Nov, 2022 |
| 10 | Garret Senger | Chief Utilities Officer | 100,048 | 0 | 100,048 | 3.0% | 19 Feb, 2026 |
| 11 | Karen B Fagg | Director | 92,828 | 0 | 92,828 | 2.8% | 22 Nov, 2022 |
| 12 | Patricia L Moss | Director | 92,212 | 0 | 92,212 | 2.8% | 22 Nov, 2022 |
| 13 | Stephanie A Sievert | Chiefaccntgregaffairsofficer | 90,503 | 0 | 90,503 | 2.7% | 19 Feb, 2026 |
| 14 | Trevor J Hastings | President Ceo Wbi Holdings | 76,360 | 0 | 76,360 | 2.3% | 01 Jun, 2023 |
| 15 | Margaret A Link | Vp And Cio | 74,387 | 0 | 74,387 | 2.2% | 16 Feb, 2024 |
| 16 | Karl A Liepitz | Vp, Gen Counsel Secretary | 64,283 | 0 | 64,283 | 1.9% | 01 Jun, 2023 |
| 17 | Edward A Ryan | Director | 44,727 | 0 | 44,727 | 1.3% | 17 Nov, 2023 |
| 18 | David M Sparby | Director | 43,463 | 0 | 43,463 | 1.3% | 17 Nov, 2023 |
| 19 | Paul R. Sanderson | Vp, Clo Secretary | 38,066 | 0 | 38,066 | 1.1% | 16 Feb, 2024 |
| 20 | Chenxi Wang | Director | 33,691 | 0 | 33,691 | 1.0% | 19 Nov, 2024 |
| 21 | Dyke A. Boese | Cio | 7,084 | 17,274 | 24,358 | 0.7% | 19 Feb, 2026 |
| 22 | Vernon A. Dosch | Director | 18,834 | 0 | 18,834 | 0.6% | 01 Jul, 2026 |
| 23 | Darrel T Anderson | Director | 17,594 | 0 | 17,594 | 0.5% | 14 Nov, 2025 |
| 24 | Anthony Donald Foti | Clo Corporate Secretary | 16,634 | 0 | 16,634 | 0.5% | 19 Feb, 2026 |
| 25 | Dale Rosenthal | Director | 16,499 | 0 | 16,499 | 0.5% | 13 Mar, 2024 |
| 26 | Douglas W. Jaeger | Director | 12,726 | 0 | 12,726 | 0.4% | 14 Nov, 2025 |
| 27 | Marian M Durkin | Director | 11,676 | 0 | 11,676 | 0.4% | 01 Jul, 2026 |
| 28 | Charles M Kelley | Director | 8,031 | 0 | 8,031 | 0.2% | 17 Feb, 2026 |
| 29 | James H. Gemmel | Director | 8,008 | 0 | 8,008 | 0.2% | 17 Nov, 2023 |
| 30 | Tammy J Miller | Director | 6,031 | 0 | 6,031 | 0.2% | 14 Nov, 2025 |
| 31 | Priti Rashmikant Patel | Director | 4,849 | 0 | 4,849 | 0.1% | 14 Nov, 2025 |
| 32 | German Carmona-Alvarez | Director | 816 | 0 | 816 | 0.0% | 22 Nov, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 30 Jun, 2026 | Marian M Durkin | Director | Acquired A | 152 | $0.00 | $0 | 11,676 | Direct |
| 30 Jun, 2026 | Vernon A. Dosch | Director | Acquired A | 1,293 | $0.00 | $0 | 18,834 | Direct |
| 31 Mar, 2026 | Vernon A. Dosch | Director | Acquired A | 1,334 | $0.00 | $0 | 17,464 | Direct |
| 31 Mar, 2026 | Marian M Durkin | Director | Acquired A | 157 | $0.00 | $0 | 11,524 | Direct |
| 17 Feb, 2026 | Jason L Vollmer | Cfo | Acquired A | 15,229 | $0.00 | $0 | 361,742 | Direct |
| 17 Feb, 2026 | Stephanie A Sievert | Chiefaccntgregaffairsofficer | Acquired A | 4,544 | $0.00 | $0 | 100,941 | Direct |
| 17 Feb, 2026 | Garret Senger | Chief Utilities Officer | Acquired A | 6,920 | $0.00 | $0 | 108,215 | Direct |
| 17 Feb, 2026 | Anthony Donald Foti | Clo Corporate Secretary | Acquired A | 8,161 | $0.00 | $0 | 16,634 | Direct |
| 17 Feb, 2026 | Anne M Jones | Chiefhrsafetyadminofficer | Acquired A | 5,523 | $0.00 | $0 | 130,027 | Direct |
| 17 Feb, 2026 | Rob L. Johnson | President Wbi | Acquired A | 5,830 | $0.00 | $0 | 93,295 | Direct |
| 17 Feb, 2026 | Nicole A Kivisto | President Ceo | Acquired A | 45,037 | $0.00 | $0 | 583,630 | Direct |
| 17 Feb, 2026 | Dyke A. Boese | Cio | Acquired A | 3,702 | $0.00 | $0 | 7,084 | Direct |
| 18 Feb, 2026 | Garret Senger | Chief Utilities Officer | Disposed F | 8,167 | $20.36 | $166.28K | 100,048 | Direct |
| 18 Feb, 2026 | Jason L Vollmer | Cfo | Disposed F | 36,766 | $20.36 | $748.56K | 324,976 | Direct |
| 18 Feb, 2026 | Stephanie A Sievert | Chiefaccntgregaffairsofficer | Disposed F | 10,438 | $20.36 | $212.52K | 90,503 | Direct |
| 18 Feb, 2026 | Rob L. Johnson | President Wbi | Disposed F | 10,630 | $20.36 | $216.43K | 82,665 | Direct |
| 18 Feb, 2026 | Anne M Jones | Chiefhrsafetyadminofficer | Disposed F | 12,010 | $20.36 | $244.52K | 118,017 | Direct |
| 18 Feb, 2026 | Nicole A Kivisto | President Ceo | Disposed F | 35,668 | $20.36 | $726.20K | 547,962 | Direct |
| 13 Feb, 2026 | Charles M Kelley | Director | Acquired P | 5,000 | $20.85 | $104.23K | 8,031 | Direct |
| 31 Dec, 2025 | Marian M Durkin | Director | Acquired A | 164 | $0.00 | $0 | 11,367 | Direct |