Employer · plans filed under one EIN
Uchicago Argonne, LLC Argonne National Laboratory
Lemont, IL · Professional, scientific and technical services
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.
Uchicago Argonne, LLC Argonne National Laboratory, based in Lemont, Illinois, sponsors 2 retirement plans with 100 or more participants: 2 defined contribution. Together they reported 11,012 participant records and $2.94B in net assets.
The largest is Argonne National Laboratory 403(b) Employee Retirement Plan, a 403(b) plan with 5,936 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 $41.9M and participant contributions $51.6M in the latest plan years; benefits paid were $244M. Schedule C compensation reported to service provider organisations totalled $158K.
Combined net assets moved from $635M in 2009 to $2.94B in 2025 (up 362%). 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 |
|---|---|---|---|---|---|---|---|
| Argonne National Laboratory 403(b) Employee Retirement Plan | 403(b) plan | 2025 | 5,936 | $1.80B | $303,542 | — | $157K |
| Argonne National Laboratory 401(a) Retirement Plan | 403(b) plan | 2025 | 5,076 | $1.14B | $223,602 | $12,842 | $1,341 |
| 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 | 2 | 11,012 | $2.94B | $41.9M | $51.6M |
| 2024 | 2 | 13,026 | $2.70B | $40.3M | $49.7M |
| 2023 | 2 | 13,169 | $2.52B | $37.7M | $46.3M |
| 2022 | 2 | 10,436 | $2.25B | $34.7M | $42.5M |
| 2021 | 2 | 10,126 | $2.65B | $33.0M | $40.0M |
| 2020 | 2 | 9,881 | $2.45B | $33.5M | $38.8M |
| 2019 | 2 | 9,546 | $2.23B | $29.4M | $34.3M |
| 2018 | 2 | 9,315 | $1.97B | $28.0M | $32.4M |
| 2017 | 2 | 9,516 | $2.11B | $27.5M | $30.9M |
| 2016 | 2 | 9,509 | $1.92B | $24.9M | $28.3M |
| 2015 | 2 | 9,950 | $1.86B | $26.0M | $29.4M |
| 2014 | 2 | 10,600 | $1.89B | $25.5M | $28.4M |
| 2013 | 2 | 13,712 | $1.88B | $25.3M | $28.3M |
| 2012 | 2 | 7,164 | $1.77B | $19.1M | $21.4M |
| 2011 | 2 | 4,460 | $1.39B | $19.2M | $20.1M |
| 2010 | 1 | 2,339 | $409M | $0 | $19.7M |
| 2009 | 2 | 4,285 | $635M | $17.1M | $18.3M |
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 |
|---|---|---|---|
| Fid Inv Inst Ops Co. | Recordkeeping and information management; Participant loan processing | 2 | $156,410 |
| TIAA-CREF | Recordkeeping and information management | 2 | $1,715 |
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 Uchicago Argonne, LLC Argonne National Laboratory have?
2 plans with 100 or more participants filed Form 5500 under its employer identification number for the latest plan years: Argonne National Laboratory 403(b) Employee Retirement Plan and Argonne National Laboratory 401(a) Retirement Plan. Smaller plans and plans filed under a subsidiary's number are not grouped here.
How much does Uchicago Argonne, LLC Argonne National Laboratory contribute to its plans?
$41,940,855 in employer contributions across these plans in their latest plan years, about $5,799 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 Fid Inv Inst Ops Co. and TIAA-CREF. 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.