Uchicago Argonne, LLC Argonne National Laboratory retirement plans

Uchicago Argonne, LLC Argonne National Laboratory, Lemont, IL. EIN 68-0628477. Annual reports 2009–2025. Also filed as Uchicago Argonne, LLC.

Uchicago Argonne, LLC Argonne National Laboratory has 2 active retirement plans on file. The largest is the Argonne National Laboratory 403(b) Employee Retirement Plan, with 5,936 participants and $1.8 billion in assets in 2025. Fidelity has been its recordkeeper since 2013. No traditional pension plan appears in Uchicago Argonne, LLC Argonne National Laboratory's filings since 2009.

Active plans: 2
Participants: 11,012
Plan assets: $2.9 billion
401(k) recordkeeper: Fidelity
Plans on file: 6
Industry: Professional services

All 6 plans

Active plans first

Argonne National Laboratory 403(b) Employee Retirement Plan

403(b)Active

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

Plan number: 005Employer EIN 68-0628477
Participants (2025): 5,936
Net assets (2025): $1.8 billion
Recordkeeper: Fidelity2013–2025
Plan administrator: Uchicago Argonne, LLC Argonne National Laboratory
9700 S. Cass Ave.
Lemont, IL 60439
(630) 252-2989As filed for 2025
In effect since: January 1, 1974

Plans merged into this one: Argonne National Laboratory Group Tax Deferred Annuity Plan for Non-Exempt Employees (2012); Argonne National Laboratory Staff Retirement Plan (2011).

Earlier sponsor: Uchicago Argonne, LLC (2009–2012).

Earlier plan names: Group Tax Deferred Annuity Program for Exempt Employees; Argonne National Laboratory Group Tax Deferred Annuity Plan for Exempt Employees; Argonne National Laboratory Group Tax Deffered Annuity Plan for Exempt Employees.

Year by year, 2009 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	5,936	$1.8 billion	Fidelity
2024	7,417	$1.7 billion	Fidelity
2023	7,558	$1.6 billion	Fidelity
2022	5,634	$1.4 billion	Fidelity
2021	5,415	$1.7 billion	Fidelity
2020	5,265	$1.6 billion	Fidelity
2019	5,092	$1.4 billion	Fidelity
2018	4,958	$1.3 billion	Fidelity
2017	4,898	$1.4 billion	Fidelity
2016	4,920	$1.3 billion	Fidelity
2015	5,235	$1.2 billion	Fidelity
2014	5,484	$1.3 billion	Fidelity
2013	8,367	$1.3 billion	Fidelity
2012	5,005	$1.2 billion	not listed
2011	2,312	$1.1 billion	not listed
2010	2,339	$409 million	not listed
2009	2,195	$371 million	not listed

Argonne National Laboratory 401(A) Retirement Plan

403(b)Active

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

Plan number: 009Employer EIN 68-0628477
Participants (2025): 5,076
Net assets (2025): $1.1 billion
Recordkeeper: FidelityEarlier: TIAA (2019), Fidelity (2018), TIAA (2013–2017)
Plan administrator: Uchicago Argonne, LLC Argonne National Laboratory
9700 S. Cass. Ave
Lemont, IL 60439
(630) 252-2989As filed for 2025
In effect since: January 1, 1994

Plans merged into this one: Argonne National Laboratory Qualified Retirement Plan for Non-Exempt Employees (2012).

Earlier sponsor: Uchicago Argonne, LLC (2009–2012).

Earlier plan names: Argonne National Laboratory Qualified Retirement Plan for Exempt Employees.

Year by year, 2009 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	5,076	$1.1 billion	Fidelity
2024	5,609	$1.0 billion	Fidelity
2023	5,611	$942 million	Fidelity
2022	4,802	$824 million	Fidelity
2021	4,711	$969 million	Fidelity
2020	4,616	$885 million	Fidelity
2019	4,454	$791 million	TIAA
2018	4,357	$683 million	Fidelity
2017	4,618	$723 million	TIAA
2016	4,589	$641 million	TIAA
2015	4,715	$610 million	TIAA
2014	5,116	$612 million	TIAA
2013	5,345	$594 million	TIAA
2012	2,159	$541 million	not listed
2011	2,148	$306 million	not listed
2009	2,090	$265 million	not listed

Argonne National Laboratory Qualified Retirement Plan for Non-Exempt Employees

403(b)Merged

Merged. In 2012 its assets moved to the Argonne National Laboratory Qualified Retirement Plan for Exempt Employees, sponsored by Uchicago Argonne, LLC Argonne National Laboratory (EIN 68-0628477, plan 009). Accounts moved with them, so that plan is the one to contact.

Plan number: 008Employer EIN 68-0628477
Participants (2011): 970
Net assets (2011): $186 million
Plan administrator: Uchicago Argonne, LLC
9700 S Cass Ave
Lemont, IL 60439
(630) 252-6919As filed for 2012
In effect since: January 1, 1979

Year by year, 2009 to 2012

Plan year	Participants	Net assets	Recordkeeper
2012	0	$0	not listed
2011	970	$186 million	not listed
2010	1,021	$191 million	not listed
2009	1,073	$180 million	not listed

Argonne National Laboratory Group Tax Deferred Annuity Plan for Non-Exempt Employees

403(b)Merged

Merged. In 2012 its assets moved to the Argonne National Laboratory Group Tax Deferred Annuity Plan for Exempt Employees, sponsored by Uchicago Argonne, LLC Argonne National Laboratory (EIN 68-0628477, plan 005). Accounts moved with them, so that plan is the one to contact.

Plan number: 006Employer EIN 68-0628477
Participants (2011): 1,191
Net assets (2011): $72.6 million
Plan administrator: Uchicago Argonne, LLC
9700 S Cass Ave
Lemont, IL 60439
(630) 252-6919As filed for 2012
In effect since: January 1, 1974

Earlier plan names: Argonne National Laboratory Group Tax Deferred Annuity Program for Non-Exempt Employees.

Year by year, 2009 to 2012

Plan year	Participants	Net assets	Recordkeeper
2012	0	$0	not listed
2011	1,191	$72.6 million	not listed
2009	1,216	$65.9 million	not listed

Argonne National Laboratory Staff Retirement Plan

403(b)Merged

Merged. In 2011 its assets moved to the Group Tax Deferred Annuity Plan for Exempt Employees, sponsored by Uchicago Argonne, LLC Argonne National Laboratory (EIN 68-0628477, plan 005). Accounts moved with them, so that plan is the one to contact.

Plan number: 003Employer EIN 68-0628477
Participants (2011): 2,767
Net assets (2011): $0
Plan administrator: Uchicago Argonne, LLC
9700 S. Cass Ave.
Lemont, IL 60439
(630) 252-6919As filed for 2011
In effect since: January 1, 1948

Year by year, 2009 to 2011

Plan year	Participants	Net assets	Recordkeeper
2011	2,767	$0	not listed
2010	2,860	$738 million	not listed
2009	3,188	$728 million	not listed

Argonne National Laboratory Prudential Group Retirement Plan

403(b)Closed

Closed. The plan filed its final annual report for 2010, which means its assets were paid out or moved and it no longer exists.

Plan number: 004Employer EIN 68-0628477
Plan administrator: Uchicago Argonne, LLC
9700 S. Cass Ave
Lemont, IL 60439
(630) 252-6919As filed for 2010
In effect since: January 1, 1948

If you had money in one of these plans

Call Fidelity (fidelity.com), which runs the Argonne National Laboratory 403(b) Employee 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 ((630) 252-2989). That number was filed for 2025; ask for the benefits or retirement plan office.
If your plan was merged, your account moved with it. Follow the link on the plan to the plan it went into, and contact that one.
If your plan closed, unclaimed balances usually went to an IRA in your name, to the PBGC's missing participants program, or to state unclaimed property. Here is how to check each one.
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.

All 6 plans

Argonne National Laboratory 403(b) Employee Retirement Plan

Argonne National Laboratory 401(A) Retirement Plan

Argonne National Laboratory Qualified Retirement Plan for Non-Exempt Employees

Argonne National Laboratory Group Tax Deferred Annuity Plan for Non-Exempt Employees

Argonne National Laboratory Staff Retirement Plan

Argonne National Laboratory Prudential Group Retirement Plan

If you had money in one of these plans

What these numbers are

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