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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)

IRS No.: 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)