SEC EDGAR filings, ownership reports, and insider transactions for MDU RESOURCES GROUP INC.
Recent SEC filings for MDU RESOURCES GROUP INC including 8-K, 4, 424B5 and more.
| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 16 Jan 2026 | 15 Jan 2026 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 02 Jan 2026 | 31 Dec 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 02 Jan 2026 | 31 Dec 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 29 Dec 2025 | 23 Dec 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 12 Dec 2025 | 11 Dec 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | FORM 8-K | 05 Dec 2025 | 03 Dec 2025 | 001-03480 |
| 424B5 | Open 424B5 document | Open XBRL data | View SEC filing for 424B5 | 424B5 | 05 Dec 2025 | 333-289348 | |
| 424B5 | Open 424B5 document | View SEC filing for 424B5 | 424B5 | 03 Dec 2025 | 333-289348 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 20 Nov 2025 | 20 Nov 2025 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Nov 2025 | 13 Nov 2025 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q | 10 Nov 2025 | 30 Sep 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K EARNINGS RELEASE | 06 Nov 2025 | 06 Nov 2025 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Oct 2025 | 30 Sep 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Oct 2025 | 30 Sep 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 09 Sep 2025 | 08 Sep 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Aug 2025 | 19 Aug 2025 | ||
| 3 | Open 3 document | View SEC filing for 3 | 14 Aug 2025 | 12 Aug 2025 | ||
| 3 | Open 3 document | View SEC filing for 3 | 14 Aug 2025 | 12 Aug 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 13 Aug 2025 | 12 Aug 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | FORM 8-K | 07 Aug 2025 | 07 Aug 2025 | 001-03480 |
| 424B5 | Open 424B5 document | Open XBRL data | View SEC filing for 424B5 | 424B5 | 07 Aug 2025 | 333-289348 | |
| S-3ASR | Open S-3ASR document | Open XBRL data | View SEC filing for S-3ASR | S-3ASR | 07 Aug 2025 | 333-289348 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q | 07 Aug 2025 | 30 Jun 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 07 Aug 2025 | 07 Aug 2025 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 16 Jul 2025 | 15 May 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2025 | 30 Jun 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2025 | 30 Jun 2025 | ||
| 11-K/A | Open 11-K/A document | View SEC filing for 11-K/A | MDU RESOURCES GROUP, INC. FORM 11-K/A | 23 Jun 2025 | 31 Dec 2024 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 18 Jun 2025 | 31 Dec 2024 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 30 May 2025 | 001-03480 | |
| 3 | Open 3 document | View SEC filing for 3 | 19 May 2025 | 13 May 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 15 May 2025 | 13 May 2025 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q | 08 May 2025 | 31 Mar 2025 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 08 May 2025 | 08 May 2025 | 001-03480 |
| ARS | Open ARS document | View SEC filing for ARS | ARS | 03 Apr 2025 | 27 Mar 2025 | 001-03480 |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 03 Apr 2025 | 001-03480 | |
| DEF 14A | Open DEF 14A document | Open XBRL data | View SEC filing for DEF 14A | DEF 14A | 03 Apr 2025 | 13 May 2025 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2025 | 31 Mar 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2025 | 31 Mar 2025 | ||
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES FORM 10-K | 20 Feb 2025 | 31 Dec 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Feb 2025 | 12 Feb 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 14 Feb 2025 | 14 Feb 2025 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 10 Feb 2025 | 10 Feb 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 06 Feb 2025 | 06 Feb 2025 | 001-03480 |
| SCHEDULE 13G/A | Open SCHEDULE 13G/A document | View SEC filing for SCHEDULE 13G/A | 30 Jan 2025 | 005-35797 | ||
| 3 | Open 3 document | View SEC filing for 3 | 14 Jan 2025 | 13 Jan 2025 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 21 Nov 2024 | 21 Nov 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 19 Nov 2024 | 15 Nov 2024 | ||
| 3 | Open 3 document | View SEC filing for 3 | 15 Nov 2024 | 15 Nov 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 14 Nov 2024 | 14 Nov 2024 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 07 Nov 2024 | 005-35797 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 09-30-2024 | 07 Nov 2024 | 30 Sep 2024 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 07 Nov 2024 | 07 Nov 2024 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 06 Nov 2024 | 31 Oct 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Nov 2024 | 31 Oct 2024 | 001-42276 | |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | 01 Nov 2024 | 005-35797 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 01 Nov 2024 | 31 Oct 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 31 Oct 2024 | 31 Oct 2024 | ||
| 3 | Open 3 document | View SEC filing for 3 | 17 Oct 2024 | 17 Oct 2024 | 001-42276 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 17 Oct 2024 | 17 Oct 2024 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | 09 Oct 2024 | 07 Oct 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 02 Oct 2024 | 01 Oct 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 30 Sep 2024 | 30 Sep 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 03 Sep 2024 | 03 Sep 2024 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | 21 Aug 2024 | 15 Aug 2024 | ||
| 3 | Open 3 document | View SEC filing for 3 | 21 Aug 2024 | 15 Aug 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 15 Aug 2024 | 15 Aug 2024 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q | 08 Aug 2024 | 30 Jun 2024 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 08 Aug 2024 | 08 Aug 2024 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 18 Jul 2024 | 18 Jul 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 28 Jun 2024 | 28 Jun 2024 | ||
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 26 Jun 2024 | 31 Dec 2023 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 22 May 2024 | 001-03480 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 20 May 2024 | 14 May 2024 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | 16 May 2024 | 14 May 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 08 May 2024 | 07 May 2024 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 03-31-2024 | 02 May 2024 | 31 Mar 2024 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 02 May 2024 | 02 May 2024 | 001-03480 |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 29 Apr 2024 | 001-03480 | |
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2024 | 29 Mar 2024 | ||
| ARS | Open ARS document | View SEC filing for ARS | MDUR 2023 ANNUAL REPORT | 29 Mar 2024 | 31 Dec 2023 | 001-03480 |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 29 Mar 2024 | 001-03480 | |
| DEF 14A | Open DEF 14A document | Open XBRL data | View SEC filing for DEF 14A | DEF 14A | 29 Mar 2024 | 14 May 2024 | 001-03480 |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | 18 Mar 2024 | 005-35797 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 18 Mar 2024 | 14 Mar 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 13 Mar 2024 | 12 Mar 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 13 Mar 2024 | 13 Mar 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 26 Feb 2024 | 22 Feb 2024 | ||
| S-8 | Open S-8 document | View SEC filing for S-8 | FORM S-8 | 23 Feb 2024 | 333-277317 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2023 FORM 10-K | 22 Feb 2024 | 31 Dec 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 21 Feb 2024 | 15 Feb 2024 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 15 Feb 2024 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2024 | 05 Jan 2024 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A | 13 Feb 2024 | 005-35797 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 08 Feb 2024 | 08 Feb 2024 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 24 Jan 2024 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 23 Jan 2024 | 005-35797 | ||
| 3 | Open 3 document | View SEC filing for 3 | 09 Jan 2024 | 06 Jan 2024 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 21 Nov 2023 | 21 Nov 2023 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 15 Nov 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2023 | 16 Nov 2023 | ||
| 3 | Open 3 document | View SEC filing for 3 | 17 Nov 2023 | 16 Nov 2023 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 17 Nov 2023 | 16 Nov 2023 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 13 Nov 2023 | 10 Nov 2023 | 001-41642 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 09-30-2023 | 02 Nov 2023 | 30 Sep 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 02 Nov 2023 | 01 Nov 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 02 Nov 2023 | 02 Nov 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 17 Aug 2023 | 17 Aug 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 10 Aug 2023 | 10 Aug 2023 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 06-30-2023 | 03 Aug 2023 | 30 Jun 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 03 Aug 2023 | 02 Aug 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Aug 2023 | 03 Aug 2023 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 12 Jul 2023 | 11 Jul 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 12 Jul 2023 | 11 Jul 2023 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 10 Jul 2023 | 10 Jul 2023 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 21 Jun 2023 | 31 Dec 2022 | 001-03480 |
| 8-K/A | Open 8-K/A document | Open XBRL data | View SEC filing for 8-K/A | MDU RESOURCES GROUP, INC. FORM 8-K | 07 Jun 2023 | 30 May 2023 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 02 Jun 2023 | 31 May 2023 | 001-41642 | |
| 3 | Open 3 document | View SEC filing for 3 | 01 Jun 2023 | 01 Jun 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 3 | Open 3 document | View SEC filing for 3 | 01 Jun 2023 | 01 Jun 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jun 2023 | 31 May 2023 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | FORM 8-K | 01 Jun 2023 | 30 May 2023 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 24 May 2023 | 001-03480 | |
| 3 | Open 3 document | View SEC filing for 3 | FORM 3 | 12 May 2023 | 09 May 2023 | |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | 12 May 2023 | 005-35797 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | FORM 8-K | 12 May 2023 | 10 May 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 11 May 2023 | 09 May 2023 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | 10 May 2023 | 10 May 2023 | 001-41642 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 03-31-2023 | 04 May 2023 | 31 Mar 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 04 May 2023 | 03 May 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 May 2023 | 04 May 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 04 May 2023 | 03 May 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 25 Apr 2023 | 25 Apr 2023 | 001-03480 |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | SC 13D/A | 24 Apr 2023 | 005-35797 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 11 Apr 2023 | 11 Apr 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 10 Apr 2023 | 10 Apr 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 10 Apr 2023 | 07 Apr 2023 | 001-03480 |
| ARS | Open ARS document | View SEC filing for ARS | MDUR 2022 ANNUAL REPORT | 24 Mar 2023 | 31 Dec 2022 | 001-03480 |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 24 Mar 2023 | 001-03480 | |
| DEF 14A | Open DEF 14A document | Open XBRL data | View SEC filing for DEF 14A | DEF 14A | 24 Mar 2023 | 001-03480 | |
| 3 | Open 3 document | View SEC filing for 3 | 03 Mar 2023 | 01 Mar 2023 | ||
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2022 FORM 10-K | 24 Feb 2023 | 31 Dec 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Feb 2023 | 16 Feb 2023 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 17 Feb 2023 | 16 Feb 2023 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 16 Feb 2023 | 16 Feb 2023 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 10 Feb 2023 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A | 09 Feb 2023 | 005-35797 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 09 Feb 2023 | 09 Feb 2023 | 001-03480 |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | 24 Jan 2023 | 005-35797 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 24 Jan 2023 | 24 Jan 2023 | 001-03480 |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | 24 Jan 2023 | 005-35797 | ||
| 4 | Open 4 document | View SEC filing for 4 | 30 Dec 2022 | 30 Dec 2022 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 15 Dec 2022 | 14 Dec 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 22 Nov 2022 | 22 Nov 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Nov 2022 | 21 Nov 2022 | ||
| 3 | Open 3 document | View SEC filing for 3 | 21 Nov 2022 | 17 Nov 2022 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 18 Nov 2022 | 17 Nov 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 17 Nov 2022 | 17 Nov 2022 | 001-03480 |
| SC 13D/A | Open SC 13D/A document | View SEC filing for SC 13D/A | 03 Nov 2022 | 005-35797 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 09-30-2022 | 03 Nov 2022 | 30 Sep 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Nov 2022 | 03 Nov 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 30 Sep 2022 | 30 Sep 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 25 Aug 2022 | 24 Aug 2022 | ||
| SC 13D | Open SC 13D document | View SEC filing for SC 13D | 08 Aug 2022 | 005-35797 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 06-30-2022 | 05 Aug 2022 | 30 Jun 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Aug 2022 | 04 Aug 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Aug 2022 | 04 Aug 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 30 Jun 2022 | 30 Jun 2022 | ||
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 27 Jun 2022 | 31 Dec 2021 | 001-03480 |
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 23 Jun 2022 | |||
| SD | Open SD document | View SEC filing for SD | SD | 25 May 2022 | 001-03480 | |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 16 May 2022 | |||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 12 May 2022 | 10 May 2022 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 03-31-2022 | 05 May 2022 | 31 Mar 2022 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 May 2022 | 04 May 2022 | 001-03480 |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 26 Apr 2022 | |||
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 14 Apr 2022 | |||
| 4 | Open 4 document | View SEC filing for 4 | 31 Mar 2022 | 31 Mar 2022 | ||
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 25 Mar 2022 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | MDU RESOURCES GROUP, INC. 2022 PROXY STATEMENT | 25 Mar 2022 | 10 May 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 28 Feb 2022 | 11 Feb 2021 | ||
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2021 FORM 10-K | 23 Feb 2022 | 31 Dec 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| 4 | Open 4 document | View SEC filing for 4 | 22 Feb 2022 | 17 Feb 2022 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 11 Feb 2022 | 005-35797 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 09 Feb 2022 | 09 Feb 2022 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A | 09 Feb 2022 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 01 Feb 2022 | 005-35797 | ||
| 5 | Open 5 document | View SEC filing for 5 | 13 Jan 2022 | 31 Dec 2021 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 10 Jan 2022 | 06 Jan 2022 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 03 Jan 2022 | 31 Dec 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 03 Jan 2022 | 31 Dec 2021 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 23 Nov 2021 | 23 Nov 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 17 Nov 2021 | 16 Nov 2021 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 09-30-2021 | 04 Nov 2021 | 30 Sep 2021 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Nov 2021 | 03 Nov 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Oct 2021 | 30 Sep 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 30 Sep 2021 | 30 Sep 2021 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 16 Aug 2021 | 10 Aug 2021 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 6-30-2021 | 05 Aug 2021 | 30 Jun 2021 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Aug 2021 | 04 Aug 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2021 | 30 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 30 Jun 2021 | 30 Jun 2021 | ||
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 22 Jun 2021 | 31 Dec 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 15 Jun 2021 | 14 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 Jun 2021 | 11 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 11 Jun 2021 | 09 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 09 Jun 2021 | 08 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 09 Jun 2021 | 08 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 08 Jun 2021 | 07 Jun 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 07 Jun 2021 | 04 Jun 2021 | ||
| SD | Open SD document | View SEC filing for SD | SD | 27 May 2021 | 001-03480 | |
| 3 | Open 3 document | View SEC filing for 3 | 17 May 2021 | 11 May 2021 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 12 May 2021 | 11 May 2021 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2021 | 06 May 2021 | 31 Mar 2021 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 06 May 2021 | 05 May 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2021 | 31 Mar 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2021 | 31 Mar 2021 | ||
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | MDU RESOURCES GROUP, INC. 2021 PROXY NOTICE | 26 Mar 2021 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | MDU RESOURCES GROUP, INC. 2021 PROXY STATEMENT | 26 Mar 2021 | 11 May 2021 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 12 Mar 2021 | 09 Mar 2021 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 24 Feb 2021 | 23 Feb 2021 | ||
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | 10-K | 19 Feb 2021 | 31 Dec 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| 4 | Open 4 document | View SEC filing for 4 | 16 Feb 2021 | 11 Feb 2021 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A | 10 Feb 2021 | 005-35797 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | 09 Feb 2021 | 005-35797 | ||
| 3 | Open 3 document | View SEC filing for 3 | 08 Feb 2021 | 06 Feb 2021 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Feb 2021 | 03 Feb 2021 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 29 Jan 2021 | 005-35797 | ||
| 4 | Open 4 document | View SEC filing for 4 | 31 Dec 2020 | 31 Dec 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 31 Dec 2020 | 31 Dec 2020 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 18 Dec 2020 | 15 Dec 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K EARNINGS GUIDANCE | 14 Dec 2020 | 14 Dec 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 19 Nov 2020 | 19 Nov 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Nov 2020 | 17 Nov 2020 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 12 Nov 2020 | 12 Nov 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 12 Nov 2020 | 11 Nov 2020 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 9-30-2020 | 05 Nov 2020 | 30 Sep 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Nov 2020 | 04 Nov 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 08 Oct 2020 | 16 Sep 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 02 Oct 2020 | 30 Sep 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 30 Sep 2020 | 30 Sep 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 21 Aug 2020 | 20 Aug 2020 | ||
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | S-3ASR | 14 Aug 2020 | 333-246323 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 06-30-2020 | 06 Aug 2020 | 30 Jun 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Aug 2020 | 04 Aug 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2020 | 30 Jun 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2020 | 30 Jun 2020 | ||
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 12 Jun 2020 | 31 Dec 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 26 May 2020 | 21 May 2020 | ||
| SD | Open SD document | View SEC filing for SD | SD | 26 May 2020 | 001-03480 | |
| 4 | Open 4 document | View SEC filing for 4 | 18 May 2020 | 18 May 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 May 2020 | 12 May 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 15 May 2020 | 14 May 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 May 2020 | 14 May 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 May 2020 | 13 May 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 14 May 2020 | 13 May 2020 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 13 May 2020 | 12 May 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 13 May 2020 | 12 May 2020 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2020 | 08 May 2020 | 31 Mar 2020 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 07 May 2020 | 07 May 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2020 | 31 Mar 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 01 Apr 2020 | 31 Mar 2020 | ||
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 27 Mar 2020 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 27 Mar 2020 | 12 May 2020 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 10 Mar 2020 | 09 Mar 2020 | ||
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | 10-K | 21 Feb 2020 | 31 Dec 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| 4 | Open 4 document | View SEC filing for 4 | 18 Feb 2020 | 13 Feb 2020 | ||
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | 14 Feb 2020 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A | 12 Feb 2020 | 005-35797 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Feb 2020 | 04 Feb 2020 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 04 Feb 2020 | 005-35797 | ||
| 4 | Open 4 document | View SEC filing for 4 | 31 Dec 2019 | 31 Dec 2019 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K EARNINGS GUIDANCE | 09 Dec 2019 | 09 Dec 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 4 | Open 4 document | View SEC filing for 4 | 20 Nov 2019 | 19 Nov 2019 | ||
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 18 Nov 2019 | 18 Nov 2019 | 001-03480 |
| S-8 | Open S-8 document | View SEC filing for S-8 | S-8 | 18 Nov 2019 | 333-234760 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 9-30-2019 | 01 Nov 2019 | 30 Sep 2019 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 30 Oct 2019 | 29 Oct 2019 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 04 Oct 2019 | 01 Oct 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Oct 2019 | 30 Sep 2019 | ||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 6-30-2019 | 02 Aug 2019 | 30 Jun 2019 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 30 Jul 2019 | 30 Jul 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | 01 Jul 2019 | 28 Jun 2019 | ||
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 14 Jun 2019 | 31 Dec 2018 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 07 Jun 2019 | 005-35797 | ||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 May 2019 | 30 May 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 May 2019 | 30 May 2019 | |
| SD | Open SD document | View SEC filing for SD | SD | 30 May 2019 | 001-03480 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 May 2019 | 17 May 2019 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 08 May 2019 | 07 May 2019 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 08 May 2019 | 07 May 2019 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2019 | 03 May 2019 | 31 Mar 2019 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 30 Apr 2019 | 30 Apr 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Apr 2019 | 29 Mar 2019 | |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 22 Mar 2019 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 22 Mar 2019 | 07 May 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 14 Mar 2019 | 14 Mar 2019 | |
| PRE 14A | Open PRE 14A document | View SEC filing for PRE 14A | PRE 14A | 08 Mar 2019 | 07 May 2019 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 22 Feb 2019 | 22 Feb 2019 | 001-03480 |
| 424B5 | Open 424B5 document | View SEC filing for 424B5 | 424B5 | 22 Feb 2019 | 333-220026 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2018 FORM 10-K | 22 Feb 2019 | 31 Dec 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2019 | 19 Feb 2019 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 19 Feb 2019 | 19 Feb 2019 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2019 | 14 Feb 2019 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 15 Feb 2019 | 14 Feb 2019 | 001-03480 |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU RESOURCES GROUP, INC. | 14 Feb 2019 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SC 13G/A | 13 Feb 2019 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 11 Feb 2019 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 06 Feb 2019 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 06 Feb 2019 | 05 Feb 2019 | 001-03480 |
| 15-12B | Open 15-12B document | View SEC filing for 15-12B | 15-12B | 14 Jan 2019 | 001-03480 | |
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 09 Jan 2019 | 31 Dec 2018 | |
| 25-NSE | Open 25-NSE document | View SEC filing for 25-NSE | 02 Jan 2019 | 001-03480 | ||
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 02 Jan 2019 | 333-212635 | |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 02 Jan 2019 | 333-114488 | |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 02 Jan 2019 | 333-27877 | |
| POSASR | Open POSASR document | View SEC filing for POSASR | POSASR | 02 Jan 2019 | 333-220026 | |
| 8-K12B | Open 8-K12B document | View SEC filing for 8-K12B | 8-K12B | 02 Jan 2019 | 31 Dec 2018 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 02 Jan 2019 | 31 Dec 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Dec 2018 | 31 Dec 2018 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 18 Dec 2018 | 18 Dec 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 21 Nov 2018 | 20 Nov 2018 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 19 Nov 2018 | 15 Nov 2018 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 15 Nov 2018 | 15 Nov 2018 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 09-30-2018 | 02 Nov 2018 | 30 Sep 2018 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 01 Nov 2018 | 31 Oct 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 28 Sep 2018 | 28 Sep 2018 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 20 Aug 2018 | 16 Aug 2018 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 16 Aug 2018 | 16 Aug 2018 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 06-30-2018 | 03 Aug 2018 | 30 Jun 2018 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 31 Jul 2018 | 31 Jul 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 29 Jun 2018 | 29 Jun 2018 | |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 15 Jun 2018 | 31 Dec 2017 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | FORM SD | 31 May 2018 | 001-03480 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 09 May 2018 | 08 May 2018 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2018 | 04 May 2018 | 31 Mar 2018 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 03 May 2018 | 02 May 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Mar 2018 | 30 Mar 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Mar 2018 | 30 Mar 2018 | |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 23 Mar 2018 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 23 Mar 2018 | 08 May 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 Mar 2018 | 13 Mar 2018 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 01 Mar 2018 | 01 Mar 2018 | 001-03480 |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2017 FORM 10-K | 23 Feb 2018 | 31 Dec 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K - COMPENSATION | 21 Feb 2018 | 14 Feb 2018 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2018 | 16 Feb 2018 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MCDONALD'S CORPORATION | 14 Feb 2018 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SC 13G/A | 12 Feb 2018 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 09 Feb 2018 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 07 Feb 2018 | 06 Feb 2018 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 25 Jan 2018 | 005-35797 | ||
| 5/A | Open 5/A document | View SEC filing for 5/A | PRIMARY DOCUMENT | 23 Jan 2018 | 31 Dec 2017 | |
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 19 Jan 2018 | 31 Dec 2017 | |
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 18 Jan 2018 | 31 Dec 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2018 | 29 Dec 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2018 | 29 Dec 2017 | |
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 02 Jan 2018 | 31 Dec 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 07 Dec 2017 | 06 Dec 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2017 | 21 Nov 2017 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Nov 2017 | 16 Nov 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 21 Nov 2017 | 21 Nov 2017 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 9-30-2017 | 03 Nov 2017 | 30 Sep 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 01 Nov 2017 | 01 Nov 2017 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 19 Oct 2017 | 16 Oct 2017 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 02 Oct 2017 | 30 Sep 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 02 Oct 2017 | 30 Sep 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 02 Oct 2017 | 30 Sep 2017 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Sep 2017 | 15 Sep 2017 | 001-03480 |
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | S-3ASR | 18 Aug 2017 | 333-220026 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 14 Aug 2017 | 11 Aug 2017 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 06-30-2017 | 04 Aug 2017 | 30 Jun 2017 | 001-03480 |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 01 Aug 2017 | 01 Aug 2017 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2017 | 30 Jun 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2017 | 30 Jun 2017 | |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES FORM 11-K | 16 Jun 2017 | 31 Dec 2016 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 25 May 2017 | 001-03480 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 24 May 2017 | 23 May 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 10 May 2017 | 09 May 2017 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2017 | 08 May 2017 | 31 Mar 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 03 May 2017 | 03 May 2017 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2017 | 31 Mar 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2017 | 31 Mar 2017 | |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 24 Mar 2017 | 001-03480 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 24 Mar 2017 | 24 Mar 2017 | 001-03480 |
| PRE 14A | Open PRE 14A document | View SEC filing for PRE 14A | PRE 14A | 14 Mar 2017 | 14 Mar 2017 | 001-03480 |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2016 FORM 10-K | 24 Feb 2017 | 31 Dec 2016 | 001-03480 |
| 4/A | Open 4/A document | View SEC filing for 4/A | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2017 | 16 Feb 2017 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Feb 2017 | 16 Feb 2017 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SC 13G/A | 14 Feb 2017 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 10 Feb 2017 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 10 Feb 2017 | 005-35797 | ||
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 10 Feb 2017 | 005-35797 | ||
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU RESOURCES GROUP, INC. | 09 Feb 2017 | 005-35797 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 01 Feb 2017 | 01 Feb 2017 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 25 Jan 2017 | 005-35797 | ||
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 05 Jan 2017 | 01 Jan 2017 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2017 | 31 Dec 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2017 | 31 Dec 2016 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 03 Jan 2017 | 03 Jan 2017 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 13 Dec 2016 | 29 Nov 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Dec 2016 | 07 Dec 2016 | |
| POSASR | Open POSASR document | View SEC filing for POSASR | POSASR | 05 Dec 2016 | 333-200174 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Nov 2016 | 29 Nov 2016 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 23 Nov 2016 | 22 Nov 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2016 | 21 Nov 2016 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Nov 2016 | 21 Nov 2016 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Nov 2016 | 17 Nov 2016 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 9-30-2016 | 07 Nov 2016 | 30 Sep 2016 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K | 03 Nov 2016 | 02 Nov 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2016 | 30 Sep 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2016 | 30 Sep 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 25 Aug 2016 | 24 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Aug 2016 | 23 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 23 Aug 2016 | 22 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 23 Aug 2016 | 22 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Aug 2016 | 19 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Aug 2016 | 18 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Aug 2016 | 17 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 17 Aug 2016 | 16 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Aug 2016 | 15 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 15 Aug 2016 | 12 Aug 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Aug 2016 | 11 Aug 2016 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 6-30-2016 | 05 Aug 2016 | 30 Jun 2016 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Aug 2016 | 02 Aug 2016 | 001-03480 |
| S-8 | Open S-8 document | View SEC filing for S-8 | S-8 | 22 Jul 2016 | 333-212635 | |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K/A | 21 Jul 2016 | 24 Jun 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2016 | 30 Jun 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2016 | 30 Jun 2016 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 28 Jun 2016 | 24 Jun 2016 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 17 Jun 2016 | 31 Dec 2015 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 26 May 2016 | 001-03480 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q 3-31-2016 | 06 May 2016 | 31 Mar 2016 | 001-03480 |
| 3/A | Open 3/A document | View SEC filing for 3/A | PRIMARY DOCUMENT | 05 May 2016 | 09 Jan 2016 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 May 2016 | 03 May 2016 | 001-03480 |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K/A | 29 Apr 2016 | 10 Feb 2016 | 001-03480 |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K | 29 Apr 2016 | 26 Apr 2016 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 27 Apr 2016 | 26 Apr 2016 | 001-03480 |
| DEFA14A | Open DEFA14A document | View SEC filing for DEFA14A | DEFA14A | 14 Apr 2016 | 001-03480 | |
| 8-K | Open 8-K document | Open XBRL data | View SEC filing for 8-K | 8-K | 05 Apr 2016 | 04 Apr 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2016 | 31 Mar 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2016 | 31 Mar 2016 | |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 16 Mar 2016 | 16 Mar 2016 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 08 Mar 2016 | 02 Mar 2016 | 001-03480 |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2015 FORM 10-K | 19 Feb 2016 | 31 Dec 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 18 Feb 2016 | 11 Feb 2016 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Feb 2016 | 11 Feb 2016 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU RESOURCES GROUP, INC. | 16 Feb 2016 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G AMENDMENT NO. 1 | 12 Feb 2016 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 10 Feb 2016 | 005-35797 | ||
| 4/A | Open 4/A document | View SEC filing for 4/A | PRIMARY DOCUMENT | 04 Feb 2016 | 18 Nov 2015 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. 12-31-2015 FORM 8-K | 04 Feb 2016 | 03 Feb 2016 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 26 Jan 2016 | 005-35797 | ||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Jan 2016 | 18 Dec 2015 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 13 Jan 2016 | 09 Jan 2016 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 08 Jan 2016 | 01 Jan 2016 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 04 Jan 2016 | 31 Dec 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 04 Jan 2016 | 31 Dec 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2015 | 09 Dec 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Nov 2015 | 18 Nov 2015 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K CAP EX | 17 Nov 2015 | 16 Nov 2015 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES FORM 10-Q | 06 Nov 2015 | 30 Sep 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Nov 2015 | 02 Nov 2015 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2015 | 30 Sep 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2015 | 30 Sep 2015 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES JUNE 2015 FORM 10-Q | 04 Aug 2015 | 30 Jun 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 04 Aug 2015 | 03 Aug 2015 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 27 Jul 2015 | 20 Jul 2015 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 02 Jul 2015 | 30 Jun 2015 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Jul 2015 | 30 Jun 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Jul 2015 | 30 Jun 2015 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 24 Jun 2015 | 12 Jun 2015 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 12 Jun 2015 | 31 Dec 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 08 Jun 2015 | 03 Jun 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 03 Jun 2015 | 01 Jun 2015 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SPECIALIZED DISCLOSURE REPORT | 28 May 2015 | 001-03480 | |
| 8-A12B/A | Open 8-A12B/A document | View SEC filing for 8-A12B/A | 8-A12B/A AMENDMENT NO. 9 | 08 May 2015 | 001-03480 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP 3-31-2015 FORM 10-Q | 08 May 2015 | 31 Mar 2015 | 001-03480 |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | MDU RESOURCES FORM 8-K/A EARNINGS RELEASE 3.31.15 | 07 May 2015 | 04 May 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES FORM 8-K EARNINGS RELEASE 3.31.15 | 05 May 2015 | 04 May 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K ITEM 5.07 | 30 Apr 2015 | 28 Apr 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | CURRENT REPORT | 07 Apr 2015 | 02 Apr 2015 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Apr 2015 | 31 Mar 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Apr 2015 | 31 Mar 2015 | |
| DEFR14A | Open DEFR14A document | View SEC filing for DEFR14A | DEFR14A | 24 Mar 2015 | 001-03480 | |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 19 Mar 2015 | 333-158572 | |
| ARS | Open ARS document | View SEC filing for ARS | AUTO-GENERATED PAPER DOCUMENT | 18 Mar 2015 | 31 Dec 2014 | 001-03480 |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEF 14A | 18 Mar 2015 | 28 Apr 2015 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 03 Mar 2015 | 01 Mar 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 27 Feb 2015 | 26 Feb 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 25 Feb 2015 | 25 Feb 2015 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES 2014 FORM 10-K | 20 Feb 2015 | 31 Dec 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 19 Feb 2015 | 18 Feb 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2015 | 17 Feb 2015 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2015 | 17 Feb 2015 | |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K/A | 18 Feb 2015 | 04 Jan 2015 | 001-03480 |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K/A | 18 Feb 2015 | 20 Jan 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 18 Feb 2015 | 11 Feb 2015 | 001-03480 |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU | 12 Feb 2015 | 005-35797 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | SC 13G | 12 Feb 2015 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 11 Feb 2015 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU-12-31-2014 EARNINGS RELEASE | 03 Feb 2015 | 02 Feb 2015 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 26 Jan 2015 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 23 Jan 2015 | 20 Jan 2015 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 14 Jan 2015 | 09 Jan 2015 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 09 Jan 2015 | 09 Jan 2015 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 08 Jan 2015 | 04 Jan 2015 | 001-03480 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Dec 2014 | 31 Dec 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Dec 2014 | 31 Dec 2014 | |
| 4/A | Open 4/A document | View SEC filing for 4/A | PRIMARY DOCUMENT | 29 Dec 2014 | 07 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 11 Dec 2014 | 10 Dec 2014 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 01 Dec 2014 | 29 Nov 2014 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 24 Nov 2014 | 19 Nov 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 24 Nov 2014 | 24 Nov 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2014 | 19 Nov 2014 | |
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | S-3ASR | 13 Nov 2014 | 333-200174 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 13 Nov 2014 | 13 Nov 2014 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU 2014930 FORM 10-Q | 07 Nov 2014 | 30 Sep 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 04 Nov 2014 | 03 Nov 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Oct 2014 | 30 Sep 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Oct 2014 | 30 Sep 2014 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 23 Sep 2014 | 18 Sep 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 15 Sep 2014 | 15 Sep 2014 | 001-03480 |
| S-8 | Open S-8 document | View SEC filing for S-8 | S-8 | 26 Aug 2014 | 333-198364 | |
| 8-A12B/A | Open 8-A12B/A document | View SEC filing for 8-A12B/A | 8-A12B/A | 19 Aug 2014 | 001-03480 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 19 Aug 2014 | 14 Aug 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 15 Aug 2014 | 13 Aug 2014 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | 10-Q | 08 Aug 2014 | 30 Jun 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 05 Aug 2014 | 04 Aug 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU FORM 8-K ITEM 1 | 21 Jul 2014 | 17 Jul 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2014 | 30 Jun 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2014 | 30 Jun 2014 | |
| 11-K | Open 11-K document | View SEC filing for 11-K | 11-K | 18 Jun 2014 | 31 Dec 2013 | 001-03480 |
| SD | Open SD document | View SEC filing for SD | SD | 30 May 2014 | 001-03480 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 19 May 2014 | 19 May 2014 | 001-03480 |
| 424B2 | Open 424B2 document | View SEC filing for 424B2 | PROSPECTUS SUPPLEMENT | 16 May 2014 | 333-195990 | |
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | S-3ASR | 15 May 2014 | 333-195990 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 15 May 2014 | 15 May 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2014 | 12 May 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2014 | 12 May 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2014 | 12 May 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2014 | 12 May 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 May 2014 | 07 May 2014 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | 10-Q | 07 May 2014 | 31 Mar 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 01 May 2014 | 30 Apr 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 24 Apr 2014 | 22 Apr 2014 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 14 Apr 2014 | 08 Apr 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2014 | 31 Mar 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Mar 2014 | 31 Mar 2014 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 13 Mar 2014 | 06 Mar 2014 | 001-03480 |
| ARS | Open ARS document | View SEC filing for ARS | AUTO-GENERATED PAPER DOCUMENT | 12 Mar 2014 | 31 Dec 2013 | 001-03480 |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEFINITIVE PROXY STATEMENT | 12 Mar 2014 | 22 Apr 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Feb 2014 | 21 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Feb 2014 | 21 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2014 | 20 Feb 2014 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | 10-K | 21 Feb 2014 | 31 Dec 2013 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Feb 2014 | 19 Feb 2014 | |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | 8-K/A | 19 Feb 2014 | 03 Dec 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 19 Feb 2014 | 12 Feb 2014 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Feb 2014 | 13 Feb 2014 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 13 Feb 2014 | 10 Feb 2014 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | MDU AS OF 12/31/2013 | 12 Feb 2014 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 11 Feb 2014 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 04 Feb 2014 | 03 Feb 2014 | 001-03480 |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU | 03 Feb 2014 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 30 Jan 2014 | 005-35797 | ||
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 24 Jan 2014 | 31 Dec 2013 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 23 Jan 2014 | 21 Jan 2014 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 08 Jan 2014 | 03 Jan 2014 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 19 Dec 2013 | 18 Dec 2013 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2013 | 09 Dec 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2013 | 09 Dec 2013 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 03 Dec 2013 | 03 Dec 2013 | 001-03480 |
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 02 Dec 2013 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Nov 2013 | 20 Nov 2013 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 20 Nov 2013 | 15 Nov 2013 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 3RD QUARTER 2013 FORM 10-Q | 07 Nov 2013 | 30 Sep 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 01 Nov 2013 | 31 Oct 2013 | 001-03480 |
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 31 Oct 2013 | |||
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 16 Oct 2013 | |||
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 15 Oct 2013 | 05 Sep 2013 | 001-03480 |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 13 Sep 2013 | |||
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 09 Sep 2013 | |||
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 23 Aug 2013 | |||
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 09 Aug 2013 | 01 Aug 2013 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 09 Aug 2013 | 01 Aug 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 09 Aug 2013 | 08 Aug 2013 | |
| 3/A | Open 3/A document | View SEC filing for 3/A | PRIMARY DOCUMENT | 07 Aug 2013 | 01 Jun 2013 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | 10-Q | 07 Aug 2013 | 30 Jun 2013 | 001-03480 |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 06 Aug 2013 | |||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 01 Aug 2013 | 31 Jul 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 26 Jul 2013 | 24 Jul 2013 | 001-03480 |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 24 Jul 2013 | |||
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 11 Jul 2013 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 27 Jun 2013 | 25 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Jun 2013 | 20 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Jun 2013 | 20 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Jun 2013 | 18 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 Jun 2013 | 17 Jun 2013 | |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 17 Jun 2013 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 17 Jun 2013 | 14 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 14 Jun 2013 | 13 Jun 2013 | |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 14 Jun 2013 | 31 Dec 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 Jun 2013 | 12 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Jun 2013 | 11 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Jun 2013 | 10 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Jun 2013 | 07 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 07 Jun 2013 | 06 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 06 Jun 2013 | 05 Jun 2013 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 05 Jun 2013 | 01 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 05 Jun 2013 | 04 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 04 Jun 2013 | 03 Jun 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 May 2013 | 23 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 23 May 2013 | 22 May 2013 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 22 May 2013 | 16 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 May 2013 | 21 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 May 2013 | 20 May 2013 | |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 20 May 2013 | 16 May 2013 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 20 May 2013 | 20 May 2013 | 001-03480 |
| 424B5 | Open 424B5 document | View SEC filing for 424B5 | 424B5 | 20 May 2013 | 333-174326 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 May 2013 | 17 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 17 May 2013 | 16 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 May 2013 | 15 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 15 May 2013 | 14 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2013 | 13 May 2013 | |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 13 May 2013 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 13 May 2013 | 10 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 May 2013 | 09 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 09 May 2013 | 08 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 May 2013 | 07 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 May 2013 | 07 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 May 2013 | 07 May 2013 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 07 May 2013 | 07 May 2013 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 1ST QUARTER 2013 FORM 10-Q | 07 May 2013 | 31 Mar 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K ITEM 1.04 | 06 May 2013 | 01 May 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 01 May 2013 | 30 Apr 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 25 Apr 2013 | 23 Apr 2013 | 001-03480 |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 17 Apr 2013 | |||
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 15 Apr 2013 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 29 Mar 2013 | 29 Mar 2013 | |
| ARS | Open ARS document | View SEC filing for ARS | AUTO-GENERATED PAPER DOCUMENT | 14 Mar 2013 | 31 Dec 2012 | 001-03480 |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEFINITIVE PROXY STATEMENT | 13 Mar 2013 | 23 Apr 2013 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 07 Mar 2013 | 04 Mar 2013 | 001-03480 |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES GROUP, INC. 2012 FORM 10-K | 28 Feb 2013 | 31 Dec 2012 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | SCHEDULE 13G/A - 12/31/2012 | 14 Feb 2013 | 005-35797 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | 13 Feb 2013 | 005-35797 | ||
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | 12 Feb 2013 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 11 Feb 2013 | 06 Feb 2013 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | MDU AS OF 12/31/2012 | 07 Feb 2013 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 05 Feb 2013 | 005-35797 | ||
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 05 Feb 2013 | 04 Feb 2013 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 08 Jan 2013 | 04 Jan 2013 | |
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 08 Jan 2013 | 31 Dec 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Dec 2012 | 31 Dec 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2012 | 07 Dec 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2012 | 07 Dec 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 Dec 2012 | 07 Dec 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Nov 2012 | 30 Nov 2012 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 20 Nov 2012 | 14 Nov 2012 | 001-03480 |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | MDU RESOURCES GROUP, INC. FORM 8-K/A | 20 Nov 2012 | 16 Aug 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 19 Nov 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 20 Nov 2012 | 16 Nov 2012 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 3RD QUARTER 2012 FORM 10-Q | 07 Nov 2012 | 30 Sep 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 01 Nov 2012 | 31 Oct 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 15 Oct 2012 | 02 Oct 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 28 Sep 2012 | 28 Sep 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 31 Aug 2012 | 30 Aug 2012 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 21 Aug 2012 | 16 Aug 2012 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 2ND QUARTER 2012 FORM 10-Q | 07 Aug 2012 | 30 Jun 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 02 Aug 2012 | 01 Aug 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 29 Jun 2012 | 29 Jun 2012 | |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 14 Jun 2012 | 31 Dec 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 May 2012 | 29 May 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 29 May 2012 | 25 May 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 25 May 2012 | 24 May 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 25 May 2012 | 24 May 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 May 2012 | 23 May 2012 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 1ST QUARTER FORM 10-Q | 04 May 2012 | 31 Mar 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 01 May 2012 | 30 Apr 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 27 Apr 2012 | 24 Apr 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 18 Apr 2012 | 17 Apr 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Apr 2012 | 30 Mar 2012 | |
| ARS | Open ARS document | View SEC filing for ARS | AUTO-GENERATED PAPER DOCUMENT | 09 Mar 2012 | 31 Dec 2011 | 001-03480 |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEFINITIVE PROXY STATEMENT | 09 Mar 2012 | 24 Apr 2012 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 06 Mar 2012 | 01 Mar 2012 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Mar 2012 | 28 Feb 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 27 Feb 2012 | 24 Feb 2012 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Feb 2012 | 23 Feb 2012 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES GROUP, INC. 2011 FORM 10-K | 24 Feb 2012 | 31 Dec 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 21 Feb 2012 | 16 Feb 2012 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 13G/A - AS OF 12/31/11 | 14 Feb 2012 | 005-35797 | |
| SC 13G | Open SC 13G document | View SEC filing for SC 13G | MDU AS OF 12/31/2011 | 14 Feb 2012 | 005-35797 | |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 13 Feb 2012 | 005-35797 | ||
| 5 | Open 5 document | View SEC filing for 5 | PRIMARY DOCUMENT | 03 Feb 2012 | 31 Dec 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 02 Feb 2012 | 31 Dec 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2012 | 31 Dec 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 21 Dec 2011 | 19 Dec 2011 | 001-03480 |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 16 Dec 2011 | 333-84844 | |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 16 Dec 2011 | 333-112035 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Dec 2011 | 09 Dec 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Dec 2011 | 09 Dec 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 12 Dec 2011 | 09 Dec 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 22 Nov 2011 | 21 Nov 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 21 Nov 2011 | 17 Nov 2011 | 001-03480 |
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | S-3ASR | 18 Nov 2011 | 333-178042 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 15 Nov 2011 | 15 Nov 2011 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 14 Nov 2011 | 11 Nov 2011 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 3RD QUARTER 2011 FORM 10-Q | 04 Nov 2011 | 30 Sep 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 01 Nov 2011 | 30 Sep 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 17 Oct 2011 | 17 Oct 2011 | 001-03480 |
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 03 Oct 2011 | |||
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2011 | 30 Sep 2011 | |
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 29 Sep 2011 | |||
| CORRESP | Open CORRESP document | View SEC filing for CORRESP | 02 Sep 2011 | |||
| UPLOAD | Open UPLOAD document | View SEC filing for UPLOAD | 31 Aug 2011 | |||
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 2ND QUARTER 2011 FORM 10-Q | 05 Aug 2011 | 30 Jun 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 02 Aug 2011 | 30 Jun 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2011 | 30 Jun 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 27 Jun 2011 | 27 Jun 2011 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. FORM 11-K | 14 Jun 2011 | 31 Dec 2010 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 27 May 2011 | 24 May 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | FORM 4 | 25 May 2011 | 23 May 2011 | |
| S-3ASR | Open S-3ASR document | View SEC filing for S-3ASR | MDU RESOURCES GROUP, INC. FORM S-3ASR | 19 May 2011 | 333-174326 | |
| 8-K/A | Open 8-K/A document | View SEC filing for 8-K/A | MDU RESOURCES GROUP, INC. FORM 8-K/A | 13 May 2011 | 26 Apr 2011 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 1ST QUARTER 2011 FORM 10-Q | 05 May 2011 | 31 Mar 2011 | 001-03480 |
| 3 | Open 3 document | View SEC filing for 3 | PRIMARY DOCUMENT | 04 May 2011 | 02 May 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 May 2011 | 31 Mar 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 29 Apr 2011 | 26 Apr 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 27 Apr 2011 | 26 Apr 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 04 Apr 2011 | 31 Mar 2011 | |
| ARS | Open ARS document | View SEC filing for ARS | AUTO-GENERATED PAPER DOCUMENT | 11 Mar 2011 | 31 Dec 2010 | 001-03480 |
| DEF 14A | Open DEF 14A document | View SEC filing for DEF 14A | DEFINITIVE PROXY STATEMENT | 11 Mar 2011 | 26 Apr 2011 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 Feb 2011 | 23 Feb 2011 | |
| 10-K | Open 10-K document | Open XBRL data | View SEC filing for 10-K | MDU RESOURCES GROUP, INC. FORM 10-K FOR PERIOD ENDED 12/31/2010 | 23 Feb 2011 | 31 Dec 2010 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 22 Feb 2011 | 15 Feb 2011 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 13G/A FILING AS OF 12/31/10 | 11 Feb 2011 | 005-35797 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 11 Feb 2011 | 10 Feb 2011 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Feb 2011 | 31 Dec 2010 | 001-03480 |
| SC 13G/A | Open SC 13G/A document | View SEC filing for SC 13G/A | 02 Feb 2011 | 005-35797 | ||
| NO ACT | Open NO ACT document | View SEC filing for NO ACT | AUTO-GENERATED PAPER DOCUMENT | 13 Jan 2011 | 11 Jan 2011 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8K | 12 Jan 2011 | 30 Dec 2010 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 03 Jan 2011 | 31 Dec 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Dec 2010 | 08 Dec 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Dec 2010 | 08 Dec 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Dec 2010 | 08 Dec 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Dec 2010 | 08 Dec 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Dec 2010 | 29 Nov 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 01 Dec 2010 | 30 Nov 2010 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 16 Nov 2010 | 29 Oct 2010 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 16 Nov 2010 | 15 Nov 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 08 Nov 2010 | 05 Nov 2010 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 3RD QUARTER 2010 FORM 10-Q | 03 Nov 2010 | 30 Sep 2010 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 28 Oct 2010 | 30 Sep 2010 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8K | 21 Oct 2010 | 20 Oct 2010 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Sep 2010 | 30 Sep 2010 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | 8-K | 17 Aug 2010 | 12 Aug 2010 | 001-03480 |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 2ND QUARTER 2010 FORM 10-Q | 06 Aug 2010 | 30 Jun 2010 | 001-03480 |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 03 Aug 2010 | 30 Jun 2010 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 30 Jun 2010 | 30 Jun 2010 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 18 Jun 2010 | 15 Jun 2010 | 001-03480 |
| 11-K | Open 11-K document | View SEC filing for 11-K | MDU RESOURCES GROUP, INC. 2009 FORM 11-K | 17 Jun 2010 | 31 Dec 2009 | 001-03480 |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 26 May 2010 | 25 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 May 2010 | 21 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 24 May 2010 | 21 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 18 May 2010 | 17 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 10 May 2010 | 07 May 2010 | |
| 4 | Open 4 document | View SEC filing for 4 | PRIMARY DOCUMENT | 07 May 2010 | 06 May 2010 | |
| 10-Q | Open 10-Q document | Open XBRL data | View SEC filing for 10-Q | MDU RESOURCES GROUP, INC. 1ST QUARTER 2010 FORM 10-Q | 05 May 2010 | 31 Mar 2010 | 001-03480 |
| S-8 POS | Open S-8 POS document | View SEC filing for S-8 POS | S-8 POS | 30 Apr 2010 | 033-54486 | |
| AW | Open AW document | View SEC filing for AW | AW | 30 Apr 2010 | 033-54486 | |
| 8-K | Open 8-K document | View SEC filing for 8-K | MDU RESOURCES GROUP, INC. FORM 8-K | 30 Apr 2010 | 27 Apr 2010 | 001-03480 |
| 8-A12B/A | Open 8-A12B/A document | View SEC filing for 8-A12B/A | 8-A12B/A | 30 Apr 2010 | 001-03480 |
MDU RESOURCES GROUP INC files with the SEC under CIK 0000067716. This page aggregates EDGAR filings and related ownership activity.
Industry: Mining & Quarrying Of Nonmetallic Minerals (No Fuels).