Employer · plans filed under one EIN
Mdu Resources Group, Inc.
Bismarck, ND · Utilities
Form 5500 information is as filed by the plan administrator with the Department of Labor and may be amended. Figures reflect the plan year shown, not current balances.
Mdu Resources Group, Inc., based in Bismarck, North Dakota, sponsors 2 retirement plans with 100 or more participants: 1 defined contribution and 1 defined benefit. Together they reported 3,255 participant records and $957M in net assets.
The largest is Mdu Resources Group, Inc. 401(k) Retirement Plan, an ESOP with a 401(k) feature with 2,654 participants. A person can be counted in more than one plan, so the participant total is a count of records rather than of people.
Employer contributions across the plans were $20.2M and participant contributions $24.3M in the latest plan years; benefits paid were $86.5M. Schedule C compensation reported to service provider organisations totalled $748K.
Combined net assets moved from $1.32B in 2019 to $867M in 2025 (down 34%). Plan mergers and spin-offs show up here as steps in the series.
Plans
| Plan | Kind | Plan year | Participants | Net assets | Per participant | Employer / active | Sch. C compensation |
|---|---|---|---|---|---|---|---|
| Mdu Resources Group, Inc. 401(k) Retirement Plan | ESOP with a 401(k) feature | 2025 | 2,654 | $867M | $326,732 | $9,201 | $657K |
| Mdu Resources Group, Inc. Pension Plan for Non-Bargaining Unit Employees | defined benefit pension plan | 2024 | 601 | $89.9M | $149,515 | $8,768 | $91K |
| US median, plan year 2024: DC plans $53,102 per participant, $2,175 employer contribution per active participant; DB plans $86,221 and $10,244. | |||||||
Trend by plan year
| Plan year | Plans | Participant records | Net assets | Employer contributions | Participant contributions |
|---|---|---|---|---|---|
| 2025 | 1 | 2,654 | $867M | $19.3M | $24.3M |
| 2024 | 2 | 3,173 | $865M | $20.9M | $31.4M |
| 2023 | 2 | 5,033 | $928M | $29.2M | $43.0M |
| 2022 | 2 | 11,906 | $1.42B | $54.3M | $64.6M |
| 2021 | 2 | 11,811 | $1.68B | $48.6M | $60.2M |
| 2020 | 2 | 11,602 | $1.48B | $51.1M | $55.0M |
| 2019 | 2 | 14,682 | $1.32B | $61.4M | $49.7M |
History of the plans listed above, in the years each filed the full Form 5500 with 100 or more participants. Plans that have since terminated are not included.
Service providers
| Organisation | Services reported | Plans | Compensation reported |
|---|---|---|---|
| Principal Life Insurance Company | Contract Administrator; Recordkeeping and information management; Trustee (bank, trust company, or similar financial institution); Participant loan processing | 2 | $278,623 |
| Edelman Financial Engines, LLC | Investment advisory (participants) | 1 | $242,831 |
| Wilshire Advisors LLC | Investment advisory (plan) | 1 | $94,188 |
| Deloitte & Touch LLP | Accounting (including auditing) | 2 | $94,086 |
| Principal Trust Company | Trustee (bank, trust company, or similar financial institution); Trustee (directed) | 1 | $38,093 |
Organisations paid $5,000 or more by any of these plans, from Schedule C. Individuals are not shown.
Questions and answers
How many retirement plans does Mdu Resources Group, Inc. have?
2 plans with 100 or more participants filed Form 5500 under its employer identification number for the latest plan years: Mdu Resources Group, Inc. 401(k) Retirement Plan and Mdu Resources Group, Inc. Pension Plan for Non-Bargaining Unit Employees. Smaller plans and plans filed under a subsidiary's number are not grouped here.
How much does Mdu Resources Group, Inc. contribute to its plans?
$20,243,976 in employer contributions across these plans in their latest plan years, about $9,181 per active participant record. Form 5500 reports totals and not the match or accrual formula.
Who provides services to these plans?
Schedule C filings name Principal Life Insurance Company, Edelman Financial Engines, LLC, Wilshire Advisors LLC and Deloitte & Touch LLP and others. Only organisations paid $5,000 or more by a plan are listed on Schedule C.
Where does this come from?
Form 5500 annual reports filed with the Department of Labor's EFAST2 system, from the EBSA research files, with filings received through 24 Aug 2026. Figures are as filed and may be amended.
Provenance
Source: U.S. Department of Labor, Employee Benefits Security Administration, Form 5500 research files, public domain, with filings received through 24 Aug 2026. Plans are grouped by the sponsor's employer identification number exactly as filed; a company that files under several EINs appears as several employers. See the methodology and corrections.