Civic Intelligence

Mdu Resources Group Inc.

Plan context: Mdu Resources Group Inc. 401(K) Retirement Plan

EIN 30-1133956 • Bismarck, ND • 43 filings • 7 plans

1200 West Century Ave.Bismarck, ND 58506-5650
Current Snapshot

Latest Year

2025

2025 Participants

2,102

2025 Assets

$867,145,645

2025 Contributions

$46,923,267

Historical Graphs

Total Assets Over Time

Aggregate end-of-year assets by filing year, excluding zero-asset years

$2,159,850,407$1,079,925,204$0201920222025YearValue
$867,145,645Latest year 2025

Participants Over Time

Largest reported end-of-year plan headcount by filing year, used to avoid double-counting participants across overlapping plans

8,5514,2760201920222025YearValue
2,102Latest year 2025

Company Timeline

Year summaries and individual filings are combined here so you can stay in one place while moving across years and plan filings.

Year / FilingFilingsParticipantsAssetsContributionsContrib./Participant
202512,102$867,145,645$46,923,267$22,323iApproximate average salary by contribution assumption: employee only about $558,079 at 4% or $372,053 at 6%; with 50% employer match about $372,053 at 4% or $248,035 at 6%; with 100% employer match about $279,039 at 4% or $186,026 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-2,102$867,145,645$46,923,267$22,323iApproximate average salary by contribution assumption: employee only about $558,079 at 4% or $372,053 at 6%; with 50% employer match about $372,053 at 4% or $248,035 at 6%; with 100% employer match about $279,039 at 4% or $186,026 at 6%.
202473,262$1,179,816,262$108,345,972$33,215iApproximate average salary by contribution assumption: employee only about $830,365 at 4% or $553,576 at 6%; with 50% employer match about $553,576 at 4% or $369,051 at 6%; with 100% employer match about $415,182 at 4% or $276,788 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-2,064$775,551,136$56,026,135$27,144iApproximate average salary by contribution assumption: employee only about $678,611 at 4% or $452,407 at 6%; with 50% employer match about $452,407 at 4% or $301,605 at 6%; with 100% employer match about $339,306 at 4% or $226,204 at 6%.
Mdu Resources Group Inc. Master Trust--$231,356,778--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-103$89,858,587$903,088$8,768iApproximate average salary by contribution assumption: employee only about $219,196 at 4% or $146,131 at 6%; with 50% employer match about $146,131 at 4% or $97,420 at 6%; with 100% employer match about $109,598 at 4% or $73,065 at 6%.
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$78,783,351$482,206-
Mdu Resources Group Inc. Health and Welfare Benefits Program-3,262$4,266,410$50,934,543$15,615iApproximate average salary by contribution assumption: employee only about $390,363 at 4% or $260,242 at 6%; with 50% employer match about $260,242 at 4% or $173,495 at 6%; with 100% employer match about $195,181 at 4% or $130,121 at 6%.
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-1,927---
Mdu Resources Group Inc. Employee Assistance Program-2,037---
202375,036$1,264,504,604$145,159,282$28,824iApproximate average salary by contribution assumption: employee only about $720,608 at 4% or $480,405 at 6%; with 50% employer match about $480,405 at 4% or $320,270 at 6%; with 100% employer match about $360,304 at 4% or $240,203 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-3,465$829,880,488$76,334,870$22,030iApproximate average salary by contribution assumption: employee only about $550,757 at 4% or $367,171 at 6%; with 50% employer match about $367,171 at 4% or $244,781 at 6%; with 100% employer match about $275,378 at 4% or $183,586 at 6%.
Mdu Resources Group Inc. Master Trust--$250,636,739--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-118$97,881,913$1,109,438$9,402iApproximate average salary by contribution assumption: employee only about $235,050 at 4% or $156,700 at 6%; with 50% employer match about $156,700 at 4% or $104,467 at 6%; with 100% employer match about $117,525 at 4% or $78,350 at 6%.
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$79,250,214$551,714-
Mdu Resources Group Inc. Health and Welfare Benefits Program-5,036$6,855,250$67,163,260$13,337iApproximate average salary by contribution assumption: employee only about $333,416 at 4% or $222,277 at 6%; with 50% employer match about $222,277 at 4% or $148,185 at 6%; with 100% employer match about $166,708 at 4% or $111,139 at 6%.
Mdu Resources Group Inc. Employee Assistance Program-2,046---
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-3,107---
202278,551$1,777,180,350$219,883,486$25,714iApproximate average salary by contribution assumption: employee only about $642,859 at 4% or $428,573 at 6%; with 50% employer match about $428,573 at 4% or $285,715 at 6%; with 100% employer match about $321,429 at 4% or $214,286 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-8,551$1,321,268,405$119,798,299$14,010iApproximate average salary by contribution assumption: employee only about $350,246 at 4% or $233,498 at 6%; with 50% employer match about $233,498 at 4% or $155,665 at 6%; with 100% employer match about $175,123 at 4% or $116,749 at 6%.
Mdu Resources Group Inc. Master Trust--$271,020,861--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-137$98,387,677$4,239,000$30,942iApproximate average salary by contribution assumption: employee only about $773,540 at 4% or $515,693 at 6%; with 50% employer match about $515,693 at 4% or $343,796 at 6%; with 100% employer match about $386,770 at 4% or $257,847 at 6%.
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$76,272,511$499,093-
Mdu Resources Group Inc. Health and Welfare Benefits Program-7,349$10,230,896$95,347,094$12,974iApproximate average salary by contribution assumption: employee only about $324,354 at 4% or $216,236 at 6%; with 50% employer match about $216,236 at 4% or $144,157 at 6%; with 100% employer match about $162,177 at 4% or $108,118 at 6%.
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-6,812---
Mdu Resources Group Inc. Employee Assistance Program-3,013---
202178,525$2,159,850,407$211,968,627$24,864iApproximate average salary by contribution assumption: employee only about $621,609 at 4% or $414,406 at 6%; with 50% employer match about $414,406 at 4% or $276,271 at 6%; with 100% employer match about $310,804 at 4% or $207,203 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-8,525$1,548,432,735$116,315,815$13,644iApproximate average salary by contribution assumption: employee only about $341,102 at 4% or $227,401 at 6%; with 50% employer match about $227,401 at 4% or $151,601 at 6%; with 100% employer match about $170,551 at 4% or $113,701 at 6%.
Mdu Resources Group Inc. Master Trust--$371,335,117--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-151$131,004,523--
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$99,921,333$575,369-
Mdu Resources Group Inc. Health and Welfare Benefits Program-7,101$9,156,699$95,077,443$13,389iApproximate average salary by contribution assumption: employee only about $334,733 at 4% or $223,155 at 6%; with 50% employer match about $223,155 at 4% or $148,770 at 6%; with 100% employer match about $167,366 at 4% or $111,578 at 6%.
Mdu Resources Group Inc. Employee Assistance Program-2,953---
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-6,663---
202078,495$1,970,437,479$207,750,599$24,456iApproximate average salary by contribution assumption: employee only about $611,391 at 4% or $407,594 at 6%; with 50% employer match about $407,594 at 4% or $271,729 at 6%; with 100% employer match about $305,695 at 4% or $203,797 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-8,495$1,346,210,991$119,774,880$14,099iApproximate average salary by contribution assumption: employee only about $352,486 at 4% or $234,991 at 6%; with 50% employer match about $234,991 at 4% or $156,661 at 6%; with 100% employer match about $176,243 at 4% or $117,495 at 6%.
Mdu Resources Group Inc. Master Trust--$381,029,150--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-164$135,689,762--
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$101,236,856$686,954-
Mdu Resources Group Inc. Health and Welfare Benefits Program-7,222$6,270,720$87,288,765$12,087iApproximate average salary by contribution assumption: employee only about $302,163 at 4% or $201,442 at 6%; with 50% employer match about $201,442 at 4% or $134,295 at 6%; with 100% employer match about $151,081 at 4% or $100,721 at 6%.
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-6,687---
Mdu Resources Group Inc. Employee Assistance Program-2,990---
201978,370$1,759,490,866$207,518,276$24,793iApproximate average salary by contribution assumption: employee only about $619,828 at 4% or $413,218 at 6%; with 50% employer match about $413,218 at 4% or $275,479 at 6%; with 100% employer match about $309,914 at 4% or $206,609 at 6%.
Mdu Resources Group Inc. 401(K) Retirement Plan-8,370$1,185,172,945$109,648,610$13,100iApproximate average salary by contribution assumption: employee only about $327,505 at 4% or $218,337 at 6%; with 50% employer match about $218,337 at 4% or $145,558 at 6%; with 100% employer match about $163,752 at 4% or $109,168 at 6%.
Mdu Resources Group Inc. Master Trust--$342,060,593--
Mdu Resources Group Inc. Pension Plan for Non-Bargaining Unit Employees-179$130,148,388$10,402,512$58,115iApproximate average salary by contribution assumption: employee only about $1,452,865 at 4% or $968,577 at 6%; with 50% employer match about $968,577 at 4% or $645,718 at 6%; with 100% employer match about $726,432 at 4% or $484,288 at 6%.
Mdu Resources Group Inc. Retiree Health and Welfare Benefits Program-0$94,137,323$971,447-
Mdu Resources Group Inc. Health and Welfare Benefits Program-7,014$7,971,617$86,495,707$12,332iApproximate average salary by contribution assumption: employee only about $308,297 at 4% or $205,531 at 6%; with 50% employer match about $205,531 at 4% or $137,021 at 6%; with 100% employer match about $154,148 at 4% or $102,766 at 6%.
Mdu Resources Group Inc. Flexible Spending Account Plan (Fsa)-6,664---
Mdu Resources Group Inc. Employee Assistance Program-2,230---