North Dakota › Utilities › 1,000 to 4,999 participants
Form 5500 statement · plan year 1 Jan 2025 to 31 Dec 2025
Mdu Resources Group, Inc. 401(k) Retirement Plan
Sponsored by Mdu Resources Group, Inc., Bismarck, ND
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. Form 5500 contains no individual account balances. Look up the original filing at EFAST2.
In the plan year ending 31 Dec 2025, Mdu Resources Group, Inc. 401(k) Retirement Plan covered 2,654 participants and held $867M in net assets. The plan is an ESOP with a 401(k) feature sponsored by Mdu Resources Group, Inc. of Bismarck, North Dakota.
Net assets came to $301,536 per participant in plan year 2024, well above the $50,295 median for defined contribution plans with 1,000 to 4,999 participants and well above the $137,166 median for defined contribution plans in utilities. The figure is an average across everyone in the plan, including former employees with small balances; Form 5500 holds no individual account data.
The employer contributed $19.3M during the year, or $9,201 per active participant against a same-size median of $2,045; participants contributed $24.3M and $3.3M arrived as rollovers and other contributions. Benefits paid out totalled $77.1M.
Schedule C lists 4 service provider organisations paid $5,000 or more, with reported compensation of $657K: $248 per participant, well above the same-size median of $82.08. Administrative expenses charged to the plan were $595K. Schedule C does not capture every cost: fees netted from fund returns and fees the employer pays directly are outside it.
Across the filings on record, net assets went from $1.19B in 2019 to $867M in 2025 (down 27%), and participants from 14,018 to 2,654 (down 81%).
The independent accountant's opinion on the financial statements was unmodified (unqualified).
Compared with similar plans
| Measure, plan year 2024 | This plan | Same size | Same industry | All US DC plans |
|---|---|---|---|---|
| Net assets per participant | $301,536 | $50,295 | $137,166 | $53,102 |
| Employer contributions per active participant | $9,678 | $2,045 | $5,334 | $2,175 |
| Schedule C compensation per participant | $241 | $82.08 | $145 | $123 |
| Schedule C compensation, share of net assets | 0.08% | 0.17% | 0.12% | 0.26% |
| Administrative expenses per participant | $230 | $82.20 | $139 | $116 |
Peer columns are medians for plan year 2024 across defined contribution plans with 100 or more participants: 1,000 to 4,999 participants (10,207 plans), utilities (393) and all US plans (63,460). Fee medians cover plans that report an amount.
Trend by plan year
| Plan year | Participants | Net assets | Per participant | Employer contributions | Participant contributions | Schedule C compensation |
|---|---|---|---|---|---|---|
| 2025 | 2,654 | $867M | $326,732 | $19.3M | $24.3M | $657K |
| 2024 | 2,572 | $776M | $301,536 | $20.0M | $31.4M | $621K |
| 2023 | 4,418 | $830M | $187,841 | $28.1M | $43.0M | $490K |
| 2022 | 11,281 | $1.32B | $117,123 | $50.1M | $64.6M | $449K |
| 2021 | 11,175 | $1.55B | $138,562 | $48.6M | $60.2M | $499K |
| 2020 | 10,950 | $1.35B | $122,942 | $51.1M | $55.0M | $545K |
| 2019 | 14,018 | $1.19B | $84,542 | $51.0M | $49.7M | $339K |
Years in which the plan filed the full Form 5500 with 100 or more participants, from 2009. Plan year is the year in which the plan year began.
Statement for the year
- Net assets, beginning of year$775,551,136
- Employer contributions$19,340,888
- Participant contributions$24,324,815
- Rollovers and other contributions$3,257,564
- Total contributions$46,923,267
- Total income, including investment results$169,318,790
- Benefits paid$77,127,460
- Administrative expenses$595,024
- Total expenses$77,722,486
- Net income$91,596,304
- Net transfers−$1,795
- Net assets, end of year$867,145,645
Participants
- Active participants2,102
- Retired or separated, receiving benefits1
- Retired or separated, entitled to future benefits546
- Participants with account balances2,614
- Total participants, end of year2,654
Fees and service providers
| Organisation | Services reported | Direct | Indirect |
|---|---|---|---|
| Principal Life Insurance Company | Contract Administrator; Recordkeeping and information management; Trustee (bank, trust company, or similar financial institution); Participant loan processing; Other services | $189,481 | $62,017 |
| Edelman Financial Engines, LLC | Investment advisory (participants) | $242,831 | $0 |
| Wilshire Advisors LLC | Investment advisory (plan) | $94,108 | $80 |
| Deloitte & Touch LLP | Accounting (including auditing) | $68,604 | $16 |
Schedule C, Part I line 2: providers that received $5,000 or more, with the form's own service codes. Individuals named on Schedule C (plan employees, individual trustees) are never shown and their compensation is excluded. Eligible indirect compensation disclosed by formula carries no dollar amount. See how to read Schedule C fees.
Administrative expenses on Schedule H
- Investment advisory and management fees$336,939
- Contract administrator fees$189,481
- IQPA audit fees$68,604
- Total administrative expenses$595,024
Investment structure
Assets at year end by Schedule H category. The form shows the kind of vehicle holding the money, not the funds on the menu.
- Registered investment companies (mutual funds)$470M · 54.2%
- Common/collective trusts$237M · 27.4%
- Employer securities$105M · 12.1%
- Pooled separate accounts$38.7M · 4.5%
- Receivables$8.1M · 0.9%
- Participant loans$8.0M · 0.9%
Audit and compliance answers, as filed
- Accountant's opinionUnmodified (unqualified)
- Audit scope limited under ERISA section 103(a)(3)(C)No
- Accounting firmDeloitte and Touche LLP
- Participant contributions reported as transmitted lateNo
- Covered by a fidelity bondYes, $10,000,000
- Blackout period during the yearNo
These are the plan administrator's own answers on Schedule H, Part IV. A reported late transmittal is the filer's disclosure of a timing lapse, usually corrected through the Department of Labor's voluntary program; the amount is the total involved, not a loss.
Plan characteristics
2EProfit-sharing plan2FERISA section 404(c) plan2GTotal participant-directed account plan2JCode section 401(k) feature2KCode section 401(m) arrangement2OESOP other than a leveraged ESOP2S401(k) plan or 403(b) plan that provides for automatic enrollment2TTotal or partial participant-directed account plan with a default investment account3HPlan sponsor(s) is (are) a member(s) of a controlled group
Codes entered on Form 5500 line 8a, with the labels from the official instructions. Business code 221100: Electric Power Generation, Transmission & Distribution.
Other plans of Mdu Resources Group, Inc.
| Plan | Participants | Net assets |
|---|---|---|
| Mdu Resources Group, Inc. Pension Plan for Non-Bargaining Unit Employees | 601 | $89.9M |
Similar plans in North Dakota
| Plan | Sponsor | Participants | Net assets | Per participant |
|---|---|---|---|---|
| Otter Tail Corporation Retirement Savings | Otter Tail Corporation | 3,496 | $411M | $117,584 |
| Basin Electric Power Cooperative 401(k) Plan | Basin Electric Power Cooperative | 1,163 | $446M | $383,171 |
| Minnkota Power Cooperative, Inc. Employees 401(k) Plan | Minnkota Power Cooperative, Inc. | 483 | $75.0M | $155,209 |
| Minnkota Power Cooperative, Inc. Employees Pension Plan -Plan B | Minnkota Power Cooperative, Inc. | 401 | $89.5M | $223,245 |
| Basin Electric Power Cooperative Nd/sd Union 401(k) Plan | Basin Electric Power Cooperative | 343 | $108M | $316,258 |
| Basin Electric Power Cooperative Wy/ne Union 401(k) Plan | Basin Electric Power Cooperative | 265 | $89.7M | $338,500 |
Defined contribution plans in utilities closest in size.
Questions and answers
How big is Mdu Resources Group, Inc. 401(k) Retirement Plan?
2,654 participants at the end of the plan year ending 31 Dec 2025, of whom 2,102 were active employees, with net assets of $867,145,645. Among defined contribution plans that places it in the 1,000 to 4,999 participants band, which held 10,207 plans in plan year 2024.
What does Mdu Resources Group, Inc. contribute per participant?
The filing reports $19,340,888 in employer contributions for the year, which is $9,201 per active participant; the median for plans of the same type and size was $2,045 in plan year 2024. Form 5500 reports the total only. It does not state the match formula, and the per-participant figure is an average, not any one person's contribution.
What fees does the plan pay and how do they compare?
Schedule C reports $657,137 in compensation to service provider organisations, $248 per participant or 0.08% of net assets. The same-size median among plans reporting any Schedule C compensation was $82.08 per participant. Administrative expenses on Schedule H were $595,024. Investment costs deducted inside mutual funds and other pooled vehicles are not itemised on Form 5500, so these figures are a floor rather than a full cost.
Who runs the plan?
The sponsor is Mdu Resources Group, Inc.. Recordkeeping or administration: Principal Life Insurance Company. Investment advisory or management: Edelman Financial Engines, LLC and Wilshire Advisors LLC. Trustee or custodian: Principal Life Insurance Company. The financial statements were audited by Deloitte and Touche LLP. Form 5500 also names the plan administrator's signer and other individuals; this site publishes organisations only.
Was the audit opinion unqualified?
The filing reports an unmodified (unqualified) opinion. Unmodified (formerly "unqualified") is the standard clean opinion.
How current is this, and does it show my balance?
This is the Form 5500 for the plan year 1 Jan 2025 to 31 Dec 2025, received by the Department of Labor on 19 Jun 2026. Filings are due seven months after the plan year ends, or nine and a half with an extension, so the public record always runs a year or more behind. It contains plan-level totals only: no individual balances, contributions or names of participants exist in the data.
Provenance
Source: U.S. Department of Labor, Employee Benefits Security Administration, Form 5500 research files (Form 5500, Schedule H, Schedule C) for plan years 2009 to 2025, public domain, with filings received through 24 Aug 2026. This page shows the latest filing on record for EIN 30-1133956, plan 004, received 19 Jun 2026; an amended filing replaces it at the next build. Medians and percentiles are computed by this site; see the methodology. Report an error through corrections.