# Filing Detail

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]:
SEC Accession No. 0000067716-22-000012
Filing Date
2022-02-23
Accepted
2022-02-23 12:06:44
Documents
175
Period of Report
2021-12-31

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | MDU RESOURCES 2021 FORM 10-K | mdu-20211231.htm iXBRL | 10-K | 5640289
2 | MDU RESOURCES LONG-TERM PERFORMANCE INCENTIVE PLAN | a2021ex10k.htm | EX-10.K | 67600
3 | MDU RESOURCES RESTRICTIVE STOCK UNIT AWARD AGREEMENT | a2021ex10m.htm | EX-10.M | 39247
4 | MDU RESOURCES 401 K RETIREMENT PLAN AMENDMENT 01-01-22 | a2021ex10w.htm | EX-10.W | 19786
5 | MDU RESOURCES SUBSIDIARIES OF MDU RESOURCES | a2021ex21.htm | EX-21 | 50856
6 | MDU RESOURCES CONSENT OF INDEPENDENT ACCOUNTING FIRM | a2021ex23.htm | EX-23 | 2269
7 | MDU RESOURCES CERTIFICATION OF CHIEF EXECUTIVE OFFICER | a2021ex31a.htm | EX-31.A | 8634
8 | MDU RESOURCES CERTIFICATION OF CHIEF FINANCIAL OFFICER | a2021ex31b.htm | EX-31.B | 8613
9 | MDU RESOURCES CERTIFICATION OF CEO AND CFO | a2021ex32.htm | EX-32 | 5797
10 | MDU RESOURCES MINE SAFETY DISCLOSURES | a2021ex95.htm | EX-95 | 239795
16 |  | mdu-20211231_g1.jpg | GRAPHIC | 331618
17 |  | mdu-20211231_g10.jpg | GRAPHIC | 676604
18 |  | mdu-20211231_g11.jpg | GRAPHIC | 735016
19 |  | mdu-20211231_g12.jpg | GRAPHIC | 1053973
20 |  | mdu-20211231_g2.jpg | GRAPHIC | 411617
21 |  | mdu-20211231_g3.jpg | GRAPHIC | 599649
22 |  | mdu-20211231_g4.jpg | GRAPHIC | 419799
23 |  | mdu-20211231_g5.jpg | GRAPHIC | 341144
24 |  | mdu-20211231_g6.jpg | GRAPHIC | 138384
25 |  | mdu-20211231_g7.jpg | GRAPHIC | 524955
26 |  | mdu-20211231_g8.jpg | GRAPHIC | 574187
27 |  | mdu-20211231_g9.jpg | GRAPHIC | 583602
| Complete submission text file | 0000067716-22-000012.txt |  | 39776062

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
11 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | mdu-20211231.xsd | EX-101.SCH | 110677
12 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT | mdu-20211231_cal.xml | EX-101.CAL | 101296
13 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT | mdu-20211231_def.xml | EX-101.DEF | 899676
14 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | mdu-20211231_lab.xml | EX-101.LAB | 1376311
15 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | mdu-20211231_pre.xml | EX-101.PRE | 1086187
169 | EXTRACTED XBRL INSTANCE DOCUMENT | mdu-20211231_htm.xml | XML | 5125891

Mailing Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503
Business Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503 701-530-1000
MDU RESOURCES GROUP INC (Filer) CIK: 0000067716 (see all company filings)

EIN.: 301133956 | Fiscal Year End: 1231
Type: 10-K | Act: 34 | File No.: 001-03480 | Film No.: 22662043
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)