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MDU US
Mdu Resources Group Inc
(MDU US)
$19.22
-0.14
0.75%
Ext:
$19.86
+0.64
3.31%
(Market Closed · 00:00:02 UTC)
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Financials
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Employees
SEC Filings by Owner
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Insider Ownership
EVERIST THOMAS S
(117)
Expand
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
15 Jun 2021
4
Statement of changes in beneficial ownership
11 Jun 2021
4
Statement of changes in beneficial ownership
9 Jun 2021
4
Statement of changes in beneficial ownership
8 Jun 2021
4
Statement of changes in beneficial ownership
7 Jun 2021
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
21 Nov 2018
MOSS PATRICIA L
(43)
Expand
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
25 Aug 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
24 Feb 2021
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
20 Feb 2019
5
PRIMARY DOCUMENT
9 Jan 2019
4
PRIMARY DOCUMENT
21 Nov 2018
5
PRIMARY DOCUMENT
2 Jan 2018
WILSON JOHN K
(39)
Expand
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
21 Nov 2018
4
PRIMARY DOCUMENT
7 Dec 2017
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
8 Dec 2016
4
PRIMARY DOCUMENT
22 Nov 2016
4
PRIMARY DOCUMENT
10 Dec 2015
4
PRIMARY DOCUMENT
19 Nov 2015
4
PRIMARY DOCUMENT
11 Dec 2014
LEWIS RICHARD H
(38)
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4
PRIMARY DOCUMENT
29 Mar 2013
4
PRIMARY DOCUMENT
31 Dec 2012
4
PRIMARY DOCUMENT
20 Nov 2012
4
PRIMARY DOCUMENT
28 Sep 2012
4
PRIMARY DOCUMENT
31 Aug 2012
4
PRIMARY DOCUMENT
29 Jun 2012
4
PRIMARY DOCUMENT
12 Apr 2012
4
PRIMARY DOCUMENT
3 Jan 2012
4
PRIMARY DOCUMENT
22 Nov 2011
4
PRIMARY DOCUMENT
30 Sep 2011
JOHNSON DENNIS W
(36)
Expand
4
Statement of changes in beneficial ownership
14 Nov 2025
4
Statement of changes in beneficial ownership
10 Feb 2025
4
Statement of changes in beneficial ownership
19 Nov 2024
4
Statement of changes in beneficial ownership
17 Nov 2023
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
15 May 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
21 Nov 2018
Holaday A Bart
(33)
Expand
4
PRIMARY DOCUMENT
30 Mar 2018
4
PRIMARY DOCUMENT
3 Jan 2018
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
2 Oct 2017
4
PRIMARY DOCUMENT
30 Jun 2017
4
PRIMARY DOCUMENT
31 Mar 2017
4
PRIMARY DOCUMENT
3 Jan 2017
4
PRIMARY DOCUMENT
22 Nov 2016
4
PRIMARY DOCUMENT
30 Sep 2016
4
PRIMARY DOCUMENT
30 Jun 2016
SPARBY DAVID M
(31)
Expand
4
Statement of changes in beneficial ownership
31 Oct 2024
4
Statement of changes in beneficial ownership
30 Sep 2024
4
Statement of changes in beneficial ownership
28 Jun 2024
4
Statement of changes in beneficial ownership
29 Mar 2024
4
Statement of changes in beneficial ownership
17 Nov 2023
4
Statement of changes in beneficial ownership
30 Dec 2022
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
30 Sep 2022
4
Statement of changes in beneficial ownership
30 Jun 2022
4
Statement of changes in beneficial ownership
31 Mar 2022
HELLERSTEIN MARK A
(29)
Expand
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
31 Dec 2018
4
PRIMARY DOCUMENT
21 Nov 2018
4
PRIMARY DOCUMENT
28 Sep 2018
4
PRIMARY DOCUMENT
29 Jun 2018
4
PRIMARY DOCUMENT
30 Mar 2018
4
PRIMARY DOCUMENT
3 Jan 2018
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
2 Oct 2017
PEARCE HARRY J
(27)
Expand
4
PRIMARY DOCUMENT
21 Nov 2018
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
22 Nov 2016
4
PRIMARY DOCUMENT
19 Nov 2015
4
PRIMARY DOCUMENT
20 Nov 2014
4
PRIMARY DOCUMENT
22 Nov 2013
4
PRIMARY DOCUMENT
20 Nov 2012
4
PRIMARY DOCUMENT
22 Nov 2011
4
PRIMARY DOCUMENT
24 May 2010
4
PRIMARY DOCUMENT
18 May 2010
Goodin David L
(26)
Expand
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
5
Annual statement of beneficial ownership
13 Jan 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
13 May 2020
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
31 May 2019
Kivisto Nicole A
(24)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
14 Jun 2021
4
Statement of changes in beneficial ownership
9 Jun 2021
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
Fagg Karen B
(23)
Expand
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
4
PRIMARY DOCUMENT
21 Nov 2018
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
22 Nov 2016
4
PRIMARY DOCUMENT
19 Nov 2015
4
PRIMARY DOCUMENT
20 Nov 2014
4
PRIMARY DOCUMENT
21 Nov 2013
NANCE ROBERT L
(22)
Expand
4
PRIMARY DOCUMENT
3 Jul 2006
4
PRIMARY DOCUMENT
2 May 2006
4
PRIMARY DOCUMENT
3 Apr 2006
4
PRIMARY DOCUMENT
3 Jan 2006
4
PRIMARY DOCUMENT
3 Oct 2005
4
PRIMARY DOCUMENT
12 Aug 2005
4
PRIMARY DOCUMENT
1 Jul 2005
4
PRIMARY DOCUMENT
1 Jun 2005
4
PRIMARY DOCUMENT
3 May 2005
4
PRIMARY DOCUMENT
4 Apr 2005
Schwartz Doran N
(22)
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5
PRIMARY DOCUMENT
18 Jan 2018
4
PRIMARY DOCUMENT
21 Feb 2017
4
PRIMARY DOCUMENT
16 Feb 2016
4
PRIMARY DOCUMENT
27 Feb 2015
4
PRIMARY DOCUMENT
19 Feb 2015
4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
24 Jun 2013
4
PRIMARY DOCUMENT
29 May 2012
4
PRIMARY DOCUMENT
25 May 2012
4
PRIMARY DOCUMENT
24 May 2012
RAILE VERNON A
(21)
Expand
4
PRIMARY DOCUMENT
16 Feb 2010
5
PRIMARY DOCUMENT
3 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
26 Feb 2007
4
PRIMARY DOCUMENT
20 Feb 2007
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
23 Nov 2005
4
PRIMARY DOCUMENT
29 Aug 2005
4
PRIMARY DOCUMENT
26 Aug 2005
Vollmer Jason L
(18)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
9 Sep 2025
4
Statement of changes in beneficial ownership
19 Aug 2025
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
Ryan Edward A
(16)
Expand
4
Statement of changes in beneficial ownership
17 Nov 2023
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
3 Jan 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
1 Oct 2021
4
Statement of changes in beneficial ownership
1 Jul 2021
4
Statement of changes in beneficial ownership
1 Apr 2021
4
Statement of changes in beneficial ownership
31 Dec 2020
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
2 Oct 2020
Jones Anne M
(14)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
26 Feb 2024
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
18 Feb 2020
HILDESTAD TERRY D
(13)
Expand
4
PRIMARY DOCUMENT
1 Dec 2010
4
PRIMARY DOCUMENT
26 May 2010
4
PRIMARY DOCUMENT
17 Feb 2010
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
22 Feb 2007
4
PRIMARY DOCUMENT
20 Feb 2007
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
25 Feb 2005
Bietz Steven L
(13)
Expand
4
PRIMARY DOCUMENT
20 Feb 2014
4
PRIMARY DOCUMENT
18 Feb 2014
4/A
PRIMARY DOCUMENT
29 Dec 2014
4
PRIMARY DOCUMENT
8 May 2013
4
PRIMARY DOCUMENT
17 Feb 2010
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
11 Aug 2009
4
PRIMARY DOCUMENT
20 May 2009
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
Schneider William E
(12)
Expand
4
PRIMARY DOCUMENT
7 May 2013
4
PRIMARY DOCUMENT
30 Nov 2012
5
PRIMARY DOCUMENT
3 Feb 2012
4
PRIMARY DOCUMENT
8 Nov 2010
4
PRIMARY DOCUMENT
17 Feb 2010
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
27 Feb 2007
4
PRIMARY DOCUMENT
20 Feb 2007
Link Margaret A
(12)
Expand
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
26 May 2020
4
Statement of changes in beneficial ownership
18 May 2020
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
19 Feb 2019
Sievert Stephanie A
(12)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
18 May 2020
4
Statement of changes in beneficial ownership
18 Feb 2020
CASTLEBERRY JOHN K
(11)
Expand
4
PRIMARY DOCUMENT
20 Feb 2007
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
20 May 2005
4
PRIMARY DOCUMENT
18 May 2005
4
PRIMARY DOCUMENT
17 May 2005
4
PRIMARY DOCUMENT
13 May 2005
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
24 Nov 2004
4
PRIMARY DOCUMENT
24 Aug 2004
4
PRIMARY DOCUMENT
20 Aug 2004
NORLAND CYNTHIA J
(11)
Expand
4
PRIMARY DOCUMENT
16 Feb 2016
4
PRIMARY DOCUMENT
25 Feb 2015
4
PRIMARY DOCUMENT
15 Aug 2014
4
PRIMARY DOCUMENT
13 May 2014
4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
25 Nov 2008
4
PRIMARY DOCUMENT
19 Feb 2008
3
PRIMARY DOCUMENT
18 Jul 2007
Barney David C
(11)
Expand
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
14 May 2020
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
19 Feb 2019
4
PRIMARY DOCUMENT
20 Feb 2018
4/A
PRIMARY DOCUMENT
21 Feb 2017
4
PRIMARY DOCUMENT
21 Feb 2017
Thiede Jeffrey S
(11)
Expand
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
19 Feb 2019
4
PRIMARY DOCUMENT
20 Feb 2018
4
PRIMARY DOCUMENT
21 Feb 2017
SANDNESS PAUL K
(10)
Expand
4
PRIMARY DOCUMENT
13 May 2014
4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
18 Nov 2009
4
PRIMARY DOCUMENT
27 May 2009
4
PRIMARY DOCUMENT
25 Feb 2009
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
19 May 2005
3
PRIMARY DOCUMENT
6 Apr 2004
DURKIN MARIAN M
(10)
Expand
4
Statement of changes in beneficial ownership
1 Oct
4
Statement of changes in beneficial ownership
1 Jul
4
Statement of changes in beneficial ownership
1 Apr
4
Statement of changes in beneficial ownership
2 Jan
4
Statement of changes in beneficial ownership
14 Nov 2025
4
Statement of changes in beneficial ownership
1 Oct 2025
4
Statement of changes in beneficial ownership
1 Jul 2025
4
Statement of changes in beneficial ownership
1 Apr 2025
4
Statement of changes in beneficial ownership
19 Nov 2024
3
Initial statement of beneficial ownership
21 Aug 2024
Harp John G
(10)
Expand
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
22 May 2009
4
PRIMARY DOCUMENT
20 May 2009
4
PRIMARY DOCUMENT
19 May 2009
4
PRIMARY DOCUMENT
19 May 2009
4
PRIMARY DOCUMENT
18 May 2009
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
25 Feb 2008
4
PRIMARY DOCUMENT
19 Feb 2008
3
PRIMARY DOCUMENT
22 Nov 2006
Dosch Vernon A.
(10)
Expand
4
Statement of changes in beneficial ownership
1 Oct
4
Statement of changes in beneficial ownership
1 Jul
4
Statement of changes in beneficial ownership
1 Apr
4
Statement of changes in beneficial ownership
2 Jan
4
Statement of changes in beneficial ownership
14 Nov 2025
4
Statement of changes in beneficial ownership
1 Oct 2025
4
Statement of changes in beneficial ownership
1 Jul 2025
4
Statement of changes in beneficial ownership
1 Apr 2025
4
Statement of changes in beneficial ownership
19 Nov 2024
3
Initial statement of beneficial ownership
15 Nov 2024
WHITE MARTIN A
(9)
Expand
4
PRIMARY DOCUMENT
21 Feb 2006
5
PRIMARY DOCUMENT
30 Jan 2006
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
30 Aug 2004
4
PRIMARY DOCUMENT
25 Aug 2004
4
PRIMARY DOCUMENT
24 Aug 2004
4
PRIMARY DOCUMENT
23 Aug 2004
4
PRIMARY DOCUMENT
17 Feb 2004
4
PRIMARY DOCUMENT
20 Aug 2003
Hastings Trevor J
(9)
Expand
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
22 Feb 2022
4
Statement of changes in beneficial ownership
28 Feb 2022
4
Statement of changes in beneficial ownership
16 Feb 2021
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
19 Feb 2019
4
PRIMARY DOCUMENT
20 Feb 2018
3
PRIMARY DOCUMENT
19 Oct 2017
OLSON JOHN L
(8)
Expand
4
PRIMARY DOCUMENT
20 May 2009
4
PRIMARY DOCUMENT
16 May 2008
4
PRIMARY DOCUMENT
29 Apr 2008
4
PRIMARY DOCUMENT
15 Nov 2007
4
PRIMARY DOCUMENT
1 May 2007
4
PRIMARY DOCUMENT
1 May 2006
4
PRIMARY DOCUMENT
3 May 2005
4
PRIMARY DOCUMENT
6 May 2004
ROBINSON WARREN L
(8)
Expand
4
PRIMARY DOCUMENT
23 Nov 2005
4
PRIMARY DOCUMENT
10 Nov 2005
4
PRIMARY DOCUMENT
22 Feb 2005
5
PRIMARY DOCUMENT
31 Jan 2005
4/A
PRIMARY DOCUMENT
15 Mar 2004
4
PRIMARY DOCUMENT
20 Feb 2004
4
PRIMARY DOCUMENT
17 Feb 2004
4
PRIMARY DOCUMENT
20 Aug 2003
WOOD ROBERT E
(8)
Expand
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
20 May 2005
4
PRIMARY DOCUMENT
17 May 2005
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
19 Aug 2004
4
PRIMARY DOCUMENT
17 Feb 2004
4
PRIMARY DOCUMENT
6 Feb 2004
4
PRIMARY DOCUMENT
27 Aug 2003
Stumpf John P
(8)
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4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
28 May 2008
4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
29 Aug 2007
4
PRIMARY DOCUMENT
20 Feb 2007
3
PRIMARY DOCUMENT
5 Dec 2006
Connors William R
(8)
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4
PRIMARY DOCUMENT
24 Feb 2014
4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
15 Nov 2011
4
PRIMARY DOCUMENT
14 Nov 2011
4
PRIMARY DOCUMENT
16 Nov 2009
4
PRIMARY DOCUMENT
25 Feb 2009
4
PRIMARY DOCUMENT
17 Feb 2009
3
PRIMARY DOCUMENT
5 Sep 2008
MCCRACKEN WILLIAM E
(7)
Expand
4
PRIMARY DOCUMENT
21 Nov 2018
4
PRIMARY DOCUMENT
22 Nov 2017
4
PRIMARY DOCUMENT
22 Nov 2016
4
PRIMARY DOCUMENT
19 Nov 2015
4
PRIMARY DOCUMENT
20 Nov 2014
4
PRIMARY DOCUMENT
21 Nov 2013
3
PRIMARY DOCUMENT
9 Aug 2013
Knudson Thomas C
(7)
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4
PRIMARY DOCUMENT
21 Nov 2013
4
PRIMARY DOCUMENT
20 Nov 2012
4
PRIMARY DOCUMENT
22 Nov 2011
4
PRIMARY DOCUMENT
18 May 2010
4
PRIMARY DOCUMENT
19 May 2009
4
PRIMARY DOCUMENT
8 May 2009
3
PRIMARY DOCUMENT
6 Nov 2008
Imsdahl Bruce T
(7)
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4
PRIMARY DOCUMENT
19 Feb 2008
4
PRIMARY DOCUMENT
20 Feb 2007
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
3 Feb 2006
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
30 Nov 2004
3
PRIMARY DOCUMENT
24 Nov 2004
Kuntz Daniel S
(7)
Expand
4
Statement of changes in beneficial ownership
18 Feb 2020
4
PRIMARY DOCUMENT
19 Feb 2019
4
PRIMARY DOCUMENT
20 Feb 2018
4
PRIMARY DOCUMENT
21 Feb 2017
4
PRIMARY DOCUMENT
16 Feb 2016
3/A
PRIMARY DOCUMENT
5 May 2016
3
PRIMARY DOCUMENT
13 Jan 2016
Wang Chenxi
(7)
Expand
4
Statement of changes in beneficial ownership
19 Nov 2024
4
Statement of changes in beneficial ownership
17 Nov 2023
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
4
Statement of changes in beneficial ownership
18 Nov 2020
4
Statement of changes in beneficial ownership
20 Nov 2019
3
PRIMARY DOCUMENT
8 May 2019
WELDER SISTER THOMAS
(6)
Expand
4
PRIMARY DOCUMENT
20 May 2009
4
PRIMARY DOCUMENT
30 Apr 2008
4
PRIMARY DOCUMENT
30 Apr 2007
4
PRIMARY DOCUMENT
1 May 2006
4
PRIMARY DOCUMENT
3 May 2005
4
PRIMARY DOCUMENT
6 May 2004
CHRISTOPHERSON CATHLEEN M
(6)
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4
PRIMARY DOCUMENT
1 Jun 2005
4
PRIMARY DOCUMENT
2 Mar 2005
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
29 Nov 2004
4
PRIMARY DOCUMENT
2 Mar 2004
4
PRIMARY DOCUMENT
17 Feb 2004
Del Vecchio Mark A
(6)
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4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
16 Feb 2010
4
PRIMARY DOCUMENT
17 Feb 2009
4
PRIMARY DOCUMENT
19 Feb 2008
3
PRIMARY DOCUMENT
4 Oct 2007
3/A
PRIMARY DOCUMENT
11 Dec 2008
Haider Dennis L
(6)
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5
PRIMARY DOCUMENT
19 Jan 2018
4
PRIMARY DOCUMENT
21 Feb 2017
4
PRIMARY DOCUMENT
16 Feb 2016
4
PRIMARY DOCUMENT
18 Feb 2014
3
PRIMARY DOCUMENT
5 Jun 2013
3/A
PRIMARY DOCUMENT
7 Aug 2013
Johnson Rob L.
(6)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
8 May 2024
4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
12 Jul 2023
3
Initial statement of beneficial ownership
1 Jun 2023
MDU RESOURCES GROUP INC
(5)
Expand
4
Statement of changes in beneficial ownership
1 Nov 2024
3
Initial statement of beneficial ownership
17 Oct 2024
4
Statement of changes in beneficial ownership
13 Nov 2023
4
Statement of changes in beneficial ownership
2 Jun 2023
3
Initial statement of beneficial ownership
10 May 2023
REDDING CINDY C
(5)
Expand
4
PRIMARY DOCUMENT
20 Feb 2007
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
24 Nov 2003
3
PRIMARY DOCUMENT
11 Jul 2003
Mahowald Douglass A
(5)
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4
PRIMARY DOCUMENT
24 Feb 2014
4
PRIMARY DOCUMENT
21 Feb 2014
4
PRIMARY DOCUMENT
18 Feb 2014
4
PRIMARY DOCUMENT
1 Dec 2010
3
PRIMARY DOCUMENT
23 Feb 2010
Rosenthal Dale
(5)
Expand
4
Statement of changes in beneficial ownership
13 Mar 2024
4
Statement of changes in beneficial ownership
17 Nov 2023
4
Statement of changes in beneficial ownership
22 Nov 2022
4
Statement of changes in beneficial ownership
17 Nov 2021
3
Initial statement of beneficial ownership
17 May 2021
ANDERSON DARREL T
(4)
Expand
4
Statement of changes in beneficial ownership
14 Nov 2025
4
Statement of changes in beneficial ownership
19 Nov 2024
4
Statement of changes in beneficial ownership
17 Nov 2023
3
Initial statement of beneficial ownership
17 Nov 2023
SPLICHAL DARYL A
(4)
Expand
4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
17 Feb 2004
3
PRIMARY DOCUMENT
9 Jan 2004
Liepitz Karl A
(4)
Expand
4
Statement of changes in beneficial ownership
1 Jun 2023
4
Statement of changes in beneficial ownership
21 Feb 2023
4
Statement of changes in beneficial ownership
28 Feb 2022
3
Initial statement of beneficial ownership
8 Feb 2021
Senger Garret
(4)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
4
Statement of changes in beneficial ownership
16 Feb 2024
3
Initial statement of beneficial ownership
9 Jan 2024
Boese Dyke A.
(4)
Expand
4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
16 Jul 2025
4
Statement of changes in beneficial ownership
14 Feb 2025
3
Initial statement of beneficial ownership
14 Jan 2025
ALBERTSON BRUCE R
(3)
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4
PRIMARY DOCUMENT
4 Jan 2005
4
PRIMARY DOCUMENT
6 May 2004
4
PRIMARY DOCUMENT
2 Jan 2004
SCOTT HOMER A JR
(3)
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4
PRIMARY DOCUMENT
4 Jan 2005
4
PRIMARY DOCUMENT
6 May 2004
4
PRIMARY DOCUMENT
5 Jan 2004
TIPTON RONALD D
(3)
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4
PRIMARY DOCUMENT
17 Aug 2004
4
PRIMARY DOCUMENT
17 Feb 2004
4
PRIMARY DOCUMENT
22 Aug 2003
Gatzemeier Paul
(3)
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4
PRIMARY DOCUMENT
21 Feb 2006
4
PRIMARY DOCUMENT
22 Feb 2005
3
PRIMARY DOCUMENT
21 Sep 2004
WELLS JAMES KENT
(3)
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4
PRIMARY DOCUMENT
25 May 2012
4
PRIMARY DOCUMENT
21 Feb 2012
3
PRIMARY DOCUMENT
4 May 2011
Morehouse Kenneth Frank
(3)
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4
PRIMARY DOCUMENT
13 May 2014
4
PRIMARY DOCUMENT
18 Feb 2014
3
PRIMARY DOCUMENT
8 Jan 2013
KELLEY CHARLES M
(3)
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4
Statement of changes in beneficial ownership
17 Feb
4
Statement of changes in beneficial ownership
14 Nov 2025
3
Initial statement of beneficial ownership
14 Aug 2025
Foti Anthony Donald
(3)
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4
Statement of changes in beneficial ownership
19 Feb
4
Statement of changes in beneficial ownership
14 Feb 2025
3
Initial statement of beneficial ownership
9 Oct 2024
Sanderson Paul R.
(3)
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4
Statement of changes in beneficial ownership
16 Feb 2024
4
Statement of changes in beneficial ownership
12 Jul 2023
3
Initial statement of beneficial ownership
1 Jun 2023
Jaeger Douglas W.
(3)
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4
Statement of changes in beneficial ownership
14 Nov 2025
4
Statement of changes in beneficial ownership
19 Nov 2024
3
Initial statement of beneficial ownership
16 May 2024
WILSON FLOYD E
(2)
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4
PRIMARY DOCUMENT
22 Feb 2005
4
PRIMARY DOCUMENT
17 Feb 2004
Ring Nathan W
(2)
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4
PRIMARY DOCUMENT
8 May 2014
3
PRIMARY DOCUMENT
8 Jan 2014
Carmona-Alvarez German
(2)
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4
Statement of changes in beneficial ownership
22 Nov 2022
3
Initial statement of beneficial ownership
21 Nov 2022
Gemmel James H.
(2)
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4
Statement of changes in beneficial ownership
17 Nov 2023
3
Initial statement of beneficial ownership
12 May 2023
Miller Tammy J
(2)
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4
Statement of changes in beneficial ownership
14 Nov 2025
3
Initial statement of beneficial ownership
14 Aug 2025
Patel Priti Rashmikant
(2)
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4
Statement of changes in beneficial ownership
14 Nov 2025
3
Initial statement of beneficial ownership
19 May 2025
LOBLE LESTER H II
(1)
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4
PRIMARY DOCUMENT
28 Aug 2003
Moylan Daniel B
(1)
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3
PRIMARY DOCUMENT
10 Jan 2006
FRITZ MARTIN A
(1)
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3
PRIMARY DOCUMENT
27 Jul 2015
O'Bryan Patrick L
(1)
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3
PRIMARY DOCUMENT
3 Mar 2015
DELLA ROCCA MICHAEL
(1)
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3
Initial statement of beneficial ownership
21 Aug 2024
Gray Brian R.
(1)
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3
Initial statement of beneficial ownership
3 Mar 2023
≥5% Ownership
VANGUARD GROUP INC
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SC 13G/A
Mdu Resources Group Inc
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BlackRock Inc.
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SC 13G
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NEW YORK LIFE TRUST CO
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Mdu Resources Group Inc
14 Feb 2013
SC 13G/A
Mdu Resources Group Inc
14 Feb 2012
SC 13G/A
Mdu Resources Group Inc
11 Feb 2011
SC 13G/A
Mdu Resources Group Inc
12 Feb 2010
SC 13G/A
Mdu Resources Group Inc
13 Feb 2009
SC 13G/A
Mdu Resources Group Inc
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SC 13G/A
Mdu Resources Group Inc
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SC 13G/A
Mdu Resources Group Inc
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SC 13G/A
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STATE STREET CORP
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Mdu Resources Group Inc
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SC 13G/A
Mdu Resources Group Inc
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Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
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Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
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SC 13G
Mdu Resources Group Inc
12 Feb 2015
Corvex Management LP
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Mdu Resources Group Inc
1 Nov 2024
SC 13D/A
Mdu Resources Group Inc
18 Mar 2024
SC 13D/A
Mdu Resources Group Inc
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Mdu Resources Group Inc
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Mdu Resources Group Inc
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Mdu Resources Group Inc
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SC 13D
Mdu Resources Group Inc
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PARNASSUS INVESTMENTS /CA
(5)
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SC 13G/A
Mdu Resources Group Inc
13 Feb 2019
SC 13G/A
Mdu Resources Group Inc
12 Feb 2018
SC 13G/A
Mdu Resources Group Inc
14 Feb 2017
SC 13G/A
Mdu Resources Group Inc
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Mdu Resources Group Inc
12 Feb 2015
PRICE T ROWE ASSOCIATES INC /MD/
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Mdu Resources Group Inc
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DIMENSIONAL FUND ADVISORS LP
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Mdu Resources Group Inc
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BARCLAYS GLOBAL INVESTORS NA /CA/
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5 Feb 2009
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Mdu Resources Group Inc
7 Nov 2024
VANGUARD CAPITAL MANAGEMENT LLC
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30 Apr
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29 Apr
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