Illinois › Professional, scientific and technical services › 5,000 to 24,999 participants
Form 5500 statement · plan year 1 Jan 2025 to 31 Dec 2025
Argonne National Laboratory 401(a) Retirement Plan
Sponsored by Uchicago Argonne, LLC Argonne National Laboratory, Lemont, IL
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.
Uchicago Argonne, LLC Argonne National Laboratory of Lemont, Illinois sponsors Argonne National Laboratory 401(a) Retirement Plan, a 403(b) plan. Its Form 5500 for the plan year ending 31 Dec 2025 shows 5,076 participants (3,266 active) and $1.14B in net assets.
Net assets came to $182,506 per participant in plan year 2024, well above the $64,499 median for defined contribution plans with 5,000 to 24,999 participants and well above the $73,951 median for defined contribution plans in professional, scientific and technical services. 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 $41.9M during the year, or $12,842 per active participant against a same-size median of $2,424; participants contributed —. Benefits paid out totalled $85.1M.
Schedule C lists 2 service provider organisations paid $5,000 or more, with reported compensation of $1,341: $0.26 per participant, well below the same-size median of $53.38. Administrative expenses charged to the plan were −$91K. 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 $265M in 2009 to $1.14B in 2025 (up 329%), and participants from 2,090 to 5,076 (up 143%).
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 | $182,506 | $64,499 | $73,951 | $53,102 |
| Employer contributions per active participant | $12,201 | $2,424 | $3,219 | $2,175 |
| Schedule C compensation per participant | $3.29 | $53.38 | $148 | $123 |
| Schedule C compensation, share of net assets | 0.00% | 0.09% | 0.22% | 0.26% |
| Administrative expenses per participant | — | $54.85 | $140 | $116 |
Peer columns are medians for plan year 2024 across defined contribution plans with 100 or more participants: 5,000 to 24,999 participants (2,605 plans), professional, scientific and technical services (9,776) 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 | 5,076 | $1.14B | $223,602 | $41.9M | — | $1,000 |
| 2024 | 5,609 | $1.02B | $182,506 | $40.3M | — | $18K |
| 2023 | 5,611 | $942M | $167,957 | $37.7M | — | $6,000 |
| 2022 | 4,802 | $824M | $171,555 | $34.7M | — | $0 |
| 2021 | 4,711 | $969M | $205,755 | $33.0M | — | $1,000 |
| 2020 | 4,616 | $885M | $191,760 | $33.5M | — | $2,000 |
| 2019 | 4,454 | $791M | $177,663 | $29.4M | — | $6,000 |
| 2018 | 4,357 | $683M | $156,838 | $28.0M | — | $0 |
| 2017 | 4,618 | $723M | $156,509 | $27.5M | — | $2,000 |
| 2016 | 4,589 | $641M | $139,729 | $24.9M | — | $46K |
| 2015 | 4,715 | $610M | $129,427 | $26.0M | — | $130K |
| 2014 | 5,116 | $612M | $119,623 | $25.5M | — | $98K |
| 2013 | 5,345 | $594M | $111,225 | $25.3M | $0 | $519K |
| 2012 | 2,159 | $541M | $250,528 | $19.1M | — | $1,000 |
| 2011 | 2,148 | $306M | $142,420 | $19.2M | — | $5,000 |
| 2009 | 2,090 | $265M | $126,692 | $17.1M | — | $0 |
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$1,023,674,196
- Employer contributions$41,940,855
- Participant contributions—
- Rollovers and other contributions—
- Total contributions$41,940,855
- Total income, including investment results$196,323,622
- Benefits paid$85,083,978
- Administrative expenses−$90,564
- Total expenses$84,993,414
- Net income$111,330,208
- Net transfers$0
- Net assets, end of year$1,135,004,404
Participants
- Active participants3,266
- Retired or separated, receiving benefits247
- Retired or separated, entitled to future benefits1,463
- Participants with account balances4,979
- Total participants, end of year5,076
Fees and service providers
| Organisation | Services reported | Direct | Indirect |
|---|---|---|---|
| TIAA-CREF | Recordkeeping and information management | $1,341 | $0 |
| Fid Inv Inst Ops Co. | Recordkeeping and information management; Participant loan processing | $0 | $0 |
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
- Contract administrator fees$1,341
- Total administrative expenses−$90,564
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.
- Common/collective trusts$756M · 66.6%
- Registered investment companies (mutual funds)$218M · 19.2%
- Insurance company general account$127M · 11.2%
- Cash (interest and non-interest bearing)$22.4M · 2.0%
- Pooled separate accounts$11.5M · 1.0%
Audit and compliance answers, as filed
- Accountant's opinionUnmodified (unqualified)
- Audit scope limited under ERISA section 103(a)(3)(C)No
- Accounting firmMitchell & Titus, LLP
- Participant contributions reported as transmitted lateNo
- Covered by a fidelity bondYes, $5,000,000
- 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
2LCode section 403(b)(1) arrangement (annuity contracts)2MCode section 403(b)(7) accounts (custodial accounts for regulated investment company stock)2FERISA section 404(c) plan2GTotal participant-directed account plan
Codes entered on Form 5500 line 8a, with the labels from the official instructions. Business code 541700: Scientific Research & Development Services.
Other plans of Uchicago Argonne, LLC Argonne National Laboratory
| Plan | Participants | Net assets |
|---|---|---|
| Argonne National Laboratory 403(b) Employee Retirement Plan | 5,936 | $1.80B |
Similar plans in Illinois
| Plan | Sponsor | Participants | Net assets | Per participant |
|---|---|---|---|---|
| Norc, Inc. Retirement Plan | National Opinion Research Center | 5,383 | $247M | $45,850 |
| Sargent & Lundy Savings Investment Plan | Sargent & Lundy | 5,050 | $1.25B | $246,923 |
| Daniel J. Edelman Holdings, Inc. Profit Sharing Plan | Daniel J. Edelman Holdings, Inc. | 5,561 | $544M | $97,763 |
| Circana 401(k) Retirement Savings Plan | Circana, LLC | 4,989 | $892M | $178,715 |
| Argonne National Laboratory 403(b) Employee Retirement Plan | Uchicago Argonne, LLC Argonne National Laboratory | 5,936 | $1.80B | $303,542 |
| ZS Associates, Inc. 401(k) Profit Sharing Plan | ZS Associates, Inc. | 4,450 | $659M | $147,986 |
Defined contribution plans in professional, scientific and technical services closest in size.
Questions and answers
How big is Argonne National Laboratory 401(a) Retirement Plan?
5,076 participants at the end of the plan year ending 31 Dec 2025, of whom 3,266 were active employees, with net assets of $1,135,004,404. Among defined contribution plans that places it in the 5,000 to 24,999 participants band, which held 2,605 plans in plan year 2024.
What does Uchicago Argonne, LLC Argonne National Laboratory contribute per participant?
The filing reports $41,940,855 in employer contributions for the year, which is $12,842 per active participant; the median for plans of the same type and size was $2,424 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 $1,341 in compensation to service provider organisations, $0.26 per participant or 0.00% of net assets. The same-size median among plans reporting any Schedule C compensation was $53.38 per participant. Administrative expenses on Schedule H were −$90,564. 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 Uchicago Argonne, LLC Argonne National Laboratory. Recordkeeping or administration: TIAA-CREF and Fid Inv Inst Ops Co.. The financial statements were audited by Mitchell & Titus, 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 20 Aug 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 68-0628477, plan 009, received 20 Aug 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.