Mdu Resources Group 401(k) and pension plans

Mdu Resources Group, Inc., Bismarck, ND. EIN 30-1133956. Annual reports 2009–2025.

Mdu Resources Group, Inc. has 3 active retirement plans on file. The largest is the Mdu Resources Group, Inc. 401(k) Retirement Plan, with 2,654 participants and $867 million in assets in 2025. Principal has been its recordkeeper since 2020.

Active plans: 3
Participants: 3,723
Plan assets: $1.0 billion
401(k) recordkeeper: Principal
Plans on file: 3
Industry: Utilities

All 3 plans

Active plans first

Mdu Resources Group, Inc. 401(k) Retirement Plan

401(k) with ESOPActive

Active. The plan filed its annual report for the 2025 plan year.

Plan number: 004Employer EIN 30-1133956
Participants (2025): 2,654
Net assets (2025): $867 million
Recordkeeper: PrincipalEarlier: John Hancock (2015–2019), New York Life Investment Management (2009–2014)
Plan administrator: Mdu Resources Group, Inc. Employee Benefits Committee
P.O. Box 5650
Bismarck, ND 58506
(701) 530-1000As filed for 2025
In effect since: January 1, 1984

Year by year, 2009 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	2,654	$867 million	Principal
2024	2,572	$776 million	Principal
2023	4,418	$830 million	Principal
2022	11,281	$1.3 billion	Principal
2021	11,175	$1.5 billion	Principal
2020	10,950	$1.3 billion	Principal
2019	14,018	$1.2 billion	John Hancock
2018	13,164	$970 million	John Hancock
2017	12,050	$1.0 billion	John Hancock
2016	11,880	$918 million	John Hancock
2015	11,603	$777 million	John Hancock
2014	10,932	$808 million	New York Life Investment Management
2013	10,256	$833 million	New York Life Investment Management
2012	10,218	$657 million	New York Life Investment Management
2011	10,207	$619 million	New York Life Investment Management
2010	9,977	$610 million	New York Life Investment Management
2009	10,503	$606 million	New York Life Investment Management

Mdu Resources Group, Inc. Pension Plan for Non-Bargaining Unit Employees

Pension (defined benefit), frozenActive

Active. The plan filed its annual report for the 2024 plan year.

Plan number: 001Employer EIN 30-1133956
Participants (2024): 601
Net assets (2024): $89.9 million
Administered by: Principal2020–2024
Plan administrator: Employee Benefits Committee C/O Mdu Resources Group, Inc.
1200 West Century Avenue
Bismarck, ND 58503
(701) 530-1000As filed for 2024
In effect since: January 1, 1955

Year by year, 2009 to 2024

Plan year	Participants	Net assets	Recordkeeper
2024	601	$89.9 million	Principal
2023	615	$97.9 million	Principal
2022	625	$98.4 million	Principal
2021	636	$131 million	Principal
2020	652	$136 million	Principal
2019	664	$130 million	not listed
2018	674	$109 million	not listed
2017	831	$128 million	not listed
2016	855	$118 million	not listed
2015	883	$119 million	not listed
2014	914	$132 million	not listed
2013	939	$129 million	not listed
2012	968	$119 million	not listed
2011	997	$112 million	not listed
2010	1,015	$111 million	not listed
2009	1,045	$92.4 million	not listed

Mdu Resources Group, Inc. Pension Plan for Collective Bargaining Unit Employees

Pension (defined benefit), frozenActive

Active. The plan filed its annual report for the 2024 plan year.

Plan number: 002Employer EIN 41-0423660
Participants (2024): 468
Net assets (2024): $51.9 million
Administered by: Principal2020–2024
Plan administrator: Employee Benefits Committee C/O Mdu Resources Group, Inc.
1200 West Century Avenue
Bismarck, ND 58503
(701) 530-1000As filed for 2024
In effect since: January 1, 1955

Year by year, 2009 to 2024

Plan year	Participants	Net assets	Recordkeeper
2024	468	$51.9 million	Principal
2023	478	$55.3 million	Principal
2022	483	$55.0 million	Principal
2021	495	$74.0 million	Principal
2020	515	$76.1 million	Principal
2019	520	$72.4 million	not listed
2018	526	$60.3 million	not listed
2017	617	$70.7 million	not listed
2016	636	$64.4 million	not listed
2015	651	$63.8 million	not listed
2014	665	$71.2 million	not listed
2013	685	$70.3 million	not listed
2012	702	$64.9 million	not listed
2011	723	$61.1 million	not listed
2010	746	$65.4 million	not listed
2009	773	$61.6 million	not listed

If you had money in one of these plans

Call Principal (principal.com), which runs the Mdu Resources Group, Inc. 401(k) Retirement Plan. With your Social Security number and the plan name, it can tell you whether you still have a balance and, if not, where it went.
Or call the plan administrator listed on the plan below ((701) 530-1000). That number was filed for 2025; ask for the benefits or retirement plan office.
Still stuck? The Department of Labor's benefits advisers help for free: askebsa.dol.gov or 1-866-444-3272. Never pay anyone to find your own money.

What these numbers are

They come from the Form 5500 annual reports each plan files with the Department of Labor, as the plan filed them. A plan year is usually a calendar year.
Participants counts everyone in the plan at year end: current employees, former employees who still have a balance or a pension coming, and retirees or beneficiaries being paid.
The recordkeeper is the service provider whose Schedule C entry says it keeps the plan's records. Small plans do not file Schedule C, so some plans show none.
We cannot see anyone's account. Only the plan or its recordkeeper can tell you your balance.

Sources: U.S. Department of Labor, Form 5500 datasets and PBGC trusteed plans. How we read them.