The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 30, 2026 | Fagg Karen B | Director | Grant(A) | 197 | $89.25 | $18K |
| May 20, 2026 | Hill Thomas W. | Director | Grant(A) | 2K | — | $0 |
| May 20, 2026 | Carmona-Alvarez German | Director | Grant(A) | 2K | — | $0 |
| May 20, 2026 | Chiodo Patricia | Director | Grant(A) | 2K | — | $0 |
| May 20, 2026 | Fagg Karen B | Director | Grant(A) | 2K | — | $0 |
| May 20, 2026 | Moss Patricia L | Director | Grant(A) | 2K | — | $0 |
| May 20, 2026 | Sandbrook William J | Director | Grant(A) | 2K | — | $0 |
| Mar 31, 2026 | Fagg Karen B | Director | Grant(A) | 222 | $79.51 | $18K |
| Mar 6, 2026 | Gray Brian R. | President & CEO, Director | Grant(A) | 21K | — | $0 |
| Mar 4, 2026 | Hastings Trevor J | Vice President & COO | Grant(A) | 6K | — | $0 |
| Mar 4, 2026 | Ring Nathan W | Vice President & CFO | Grant(A) | 5K | — | $0 |
| Mar 4, 2026 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Grant(A) | 5K | — | $0 |
| Mar 4, 2026 | LaChapelle Sarah L. | VP & Chief People Officer | Grant(A) | 3K | — | $0 |
| Mar 4, 2026 | Pladsen Glenn R. | VP & Chief Excellence Officer | Grant(A) | 3K | — | $0 |
| Mar 4, 2026 | Kadrmas Marney L. | VP & Chief Accounting Officer | Grant(A) | 1K | — | $0 |
| Feb 12, 2026 | Kadrmas Marney L. | VP & Chief Accounting Officer | Tax withholding(F) | 1K | $81.74 | $101K |
| Feb 12, 2026 | Ring Nathan W | Vice President & CFO | Tax withholding(F) | 2K | $81.74 | $157K |
| Feb 12, 2026 | Ring Nathan W | Vice President & CFO | Tax withholding(F) | 4K | $81.74 | $354K |
| Feb 12, 2026 | Hastings Trevor J | Vice President & COO | Tax withholding(F) | 3K | $81.74 | $235K |
| Feb 12, 2026 | Hastings Trevor J | Vice President & COO | Tax withholding(F) | 5K | $81.74 | $376K |
| Feb 12, 2026 | Gray Brian R. | President & CEO, Director | Tax withholding(F) | 20K | $81.74 | $1.6M |
| Feb 12, 2026 | Gray Brian R. | President & CEO, Director | Tax withholding(F) | 10K | $81.74 | $823K |
| Feb 12, 2026 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Tax withholding(F) | 9K | $81.74 | $707K |
| Feb 12, 2026 | Pladsen Glenn R. | VP & Chief Excellence Officer | Tax withholding(F) | 2K | $81.74 | $128K |
| Feb 12, 2026 | Pladsen Glenn R. | VP & Chief Excellence Officer | Tax withholding(F) | 1K | $81.74 | $113K |
| May 22, 2025 | Carmona-Alvarez German | Director | Grant(A) | 2K | — | $0 |
| May 22, 2025 | Chiodo Patricia | Director | Grant(A) | 2K | — | $0 |
| May 22, 2025 | Fagg Karen B | Director | Grant(A) | 2K | — | $0 |
| May 22, 2025 | Hill Thomas W. | Director | Grant(A) | 2K | — | $0 |
| May 22, 2025 | Moss Patricia L | Director | Grant(A) | 2K | — | $0 |
| May 22, 2025 | Sandbrook William J | Director | Grant(A) | 2K | — | $0 |
| Feb 28, 2025 | Gray Brian R. | President & CEO, Director | Grant(A) | 13K | — | $0 |
| Feb 27, 2025 | Christenson Nancy K. | VP of Administration | Tax withholding(F) | 2K | $94.73 | $150K |
| Feb 27, 2025 | Kadrmas Marney L. | VP & Chief Accounting Officer | Grant(A) | 709 | — | $0 |
| Feb 27, 2025 | Ring Nathan W | Vice President & CFO | Grant(A) | 3K | — | $0 |
| Feb 27, 2025 | Ring Nathan W | Vice President & CFO | Tax withholding(F) | 2K | $94.73 | $161K |
| Feb 27, 2025 | Pladsen Glenn R. | VP & Chief Excellence Officer | Grant(A) | 2K | — | $0 |
| Feb 27, 2025 | Pladsen Glenn R. | VP & Chief Excellence Officer | Tax withholding(F) | 1K | $94.73 | $122K |
| Feb 27, 2025 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Grant(A) | 3K | — | $0 |
| Feb 27, 2025 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Tax withholding(F) | 7K | $94.73 | $671K |
| Feb 27, 2025 | Hastings Trevor J | Vice President & COO | Grant(A) | 3K | — | $0 |
| Feb 27, 2025 | Hastings Trevor J | Vice President & COO | Tax withholding(F) | 4K | $94.73 | $380K |
| Dec 31, 2024 | Fagg Karen B | Director | Grant(A) | 174 | $101.43 | $18K |
| Sep 30, 2024 | Fagg Karen B | Director | Grant(A) | 198 | $89.22 | $18K |
| Jun 28, 2024 | Fagg Karen B | Director | Grant(A) | 250 | $70.48 | $18K |
| Jun 27, 2024 | Chiodo Patricia | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Fagg Karen B | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Carmona-Alvarez German | Director | Grant(A) | 720 | $77.19 | $56K |
| May 15, 2024 | Carmona-Alvarez German | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Fagg Karen B | Director | Grant(A) | 841 | $77.19 | $65K |
| May 15, 2024 | Hill Thomas W. | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Moss Patricia L | Director | Grant(A) | 720 | $77.19 | $56K |
| May 15, 2024 | Moss Patricia L | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Sandbrook William J | Director | Grant(A) | 2K | — | $0 |
| May 15, 2024 | Sandbrook William J | Director | Grant(A) | 720 | $77.19 | $56K |
| Mar 29, 2024 | Fagg Karen B | Director | Grant(A) | 219 | $80.63 | $18K |
| Feb 29, 2024 | Gray Brian R. | President & CEO, Director | Buy(P) | 1 | $73.65 | $74 |
| Feb 22, 2024 | Christenson Nancy K. | VP of Administration | Tax withholding(F) | 1K | $72.55 | $100K |
| Feb 22, 2024 | Christenson Nancy K. | VP of Administration | Grant(A) | 2K | — | $0 |
| Feb 22, 2024 | Hastings Trevor J | Vice President & COO | Grant(A) | 5K | — | $0 |
| Feb 22, 2024 | Hastings Trevor J | Vice President & COO | Tax withholding(F) | 3K | $72.55 | $238K |
| Feb 22, 2024 | Gray Brian R. | President & CEO, Director | Grant(A) | 18K | — | $0 |
| Feb 22, 2024 | Kadrmas Marney L. | Chief Accounting Officer | Grant(A) | 1K | — | $0 |
| Feb 22, 2024 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Tax withholding(F) | 5K | $72.55 | $380K |
| Feb 22, 2024 | Liepitz Karl A | VP, Chief Legal Officer & Sec. | Grant(A) | 4K | — | $0 |
| Feb 22, 2024 | Pladsen Glenn R. | VP of Support Services | Grant(A) | 2K | — | $0 |
| Feb 22, 2024 | Pladsen Glenn R. | VP of Support Services | Tax withholding(F) | 941 | $72.55 | $68K |
| Feb 22, 2024 | Ring Nathan W | Vice President & CFO | Grant(A) | 5K | — | $0 |
| Feb 22, 2024 | Ring Nathan W | Vice President & CFO | Tax withholding(F) | 2K | $72.55 | $109K |
| Nov 15, 2023 | Carmona-Alvarez German | Director | Grant(A) | 3K | $57.57 | $150K |
| Nov 15, 2023 | Everist Thomas S | Director | Grant(A) | 3K | $57.57 | $150K |
| Nov 15, 2023 | Fagg Karen B | Director | Grant(A) | 3K | $57.57 | $165K |
| Nov 15, 2023 | Moss Patricia L | Director | Grant(A) | 3K | $57.57 | $150K |
| Nov 15, 2023 | Sandbrook William J | Director | Grant(A) | 2K | $57.57 | $87K |
| Nov 10, 2023 | Mdu Resources Group Inc | 10% Owner | Other(J) | 5.7M | — | $0 |
| Jul 12, 2023 | Christenson Nancy K. | VP of Administration | Grant(A) | 4K | — | $0 |
| Jul 12, 2023 | Gray Brian R. | President & CEO, Director | Grant(A) | 42K | — | $0 |
| Jul 12, 2023 | Hastings Trevor J | Vice President & COO | Grant(A) | 7K | — | $0 |
| Jul 12, 2023 | Kadrmas Marney L. | Chief Accounting Officer | Grant(A) | 3K | — | $0 |
| Jul 12, 2023 | Pladsen Glenn R. | VP of Support Services | Grant(A) | 4K | — | $0 |
| Jul 12, 2023 | Ring Nathan W | Vice President & CFO | Grant(A) | 11K | — | $0 |
| May 31, 2023 | Mdu Resources Group Inc | 10% Owner | Other(J) | 51.3M | — | $0 |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2021-03-29 → 2026-07-11. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).