Amentum Nuclear & Environment Holdings 401(k) and pension plans

Amentum Nuclear & Environment Holdings, Inc., Chantilly, VA. EIN 26-1320627. Annual reports 2009–2024. Also filed as Urs E&c Holdings, Inc.; AECOM E&c Holdings, Inc.

Amentum Nuclear & Environment Holdings, Inc. has 2 active retirement plans on file. The largest is the Urs Government Services Group Pension Plan, with 489 participants and $33.0 million in assets in 2024. Milliman has been its administrator since 2009.

Active plans
2
Participants
924
Plan assets
$59.1 million
Administered by
Milliman
Plans on file
4
Industry
Professional services

All 4 plans

Active plans first

Urs Government Services Group Pension Plan

Pension (defined benefit), frozenActive

Active. The plan filed its annual report for the 2024 plan year.

Plan number
008Employer EIN 26-1320627
Participants (2024)
489
Net assets (2024)
$33.0 million
Administered by
Milliman2009–2024
Plan administrator
Amentum Nuclear & Environment Holdings, Inc.
4800 Westfields BLVD, Suite 400
Chantilly, VA 20151
(301) 944-3100As filed for 2024
In effect since
April 1, 1999

Earlier sponsors: Urs E&c Holdings, Inc. (2009–2014); AECOM E&c Holdings, Inc. (2015–2019).

Earlier plan names: Washington Government Services Group Pension Plan.

Year by year, 2009 to 2024
Plan yearParticipantsNet assetsRecordkeeper
2024489$33.0 millionMilliman
2023492$33.3 millionMilliman
2022499$30.7 millionMilliman
2021505$39.6 millionMilliman
2020512$39.2 millionMilliman
2019517$35.7 millionMilliman
2018522$30.8 millionMilliman
2017524$34.2 millionMilliman
2016526$30.9 millionMilliman
2015531$30.1 millionMilliman
2014533$32.5 millionMilliman
2013540$30.9 millionMilliman
2012544$29.4 millionMilliman
2011551$26.7 millionMilliman
2010556$24.9 millionMilliman
2009558$22.9 millionMilliman

Urs Professional Solutions Pension Plan

Pension (defined benefit), frozenActive

Active. The plan filed its annual report for the 2024 plan year.

Plan number
011Employer EIN 26-1320627
Participants (2024)
435
Net assets (2024)
$26.1 million
Administered by
Milliman2009–2024
Plan administrator
Amentum Nuclear & Environment Holdings, Inc.
4800 Westfields BLVD, Suite 400
Chantilly, VA 20151
(301) 944-3100As filed for 2024
In effect since
October 1, 1997

Earlier sponsors: Urs E&c Holdings, Inc. (2009–2014); AECOM E&c Holdings, Inc. (2015–2019).

Earlier plan names: Washington Safety Management Solutions Pension Plan; Urs Safety Management Solutions Pension Plan; Urs Professional Solutions LLC Pension Plan.

Year by year, 2009 to 2024
Plan yearParticipantsNet assetsRecordkeeper
2024435$26.1 millionMilliman
2023438$26.4 millionMilliman
2022438$24.6 millionMilliman
2021440$31.3 millionMilliman
2020445$32.6 millionMilliman
2019446$29.8 millionMilliman
2018448$25.3 millionMilliman
2017450$28.8 millionMilliman
2016452$25.7 millionMilliman
2015451$24.7 millionMilliman
2014454$22.3 millionMilliman
2013460$21.1 millionMilliman
2012462$22.1 millionMilliman
2011462$20.1 millionMilliman
2010462$18.9 millionMilliman
2009465$17.4 millionMilliman

Washington Group International Retirement Savings Plan for Puerto Rico Based Employees

401(k)Merged

Merged. In 2010 its assets moved to the Urs Caribe, LLP Section 1165(E) Retirement Plan, sponsored by AECOM (EIN 66-0553974, plan 102). Accounts moved with them, so that plan is the one to contact.

Plan number
006Employer EIN 26-1320627
Participants (2009)
79
Net assets (2009)
$4.4 million
Plan administrator
Urs E&c Holdings, Inc.
P.O. Box 73
Boise, ID 83729
(208) 386-5000As filed for 2010
In effect since
January 1, 1995
Year by year, 2009 to 2010
Plan yearParticipantsNet assetsRecordkeeper
20100$0not listed
200979$4.4 millionnot listed

Washington Group International 401(k) Retirement Savings Plan

401(k)Merged

Merged. In 2010 its assets moved to the Urs Corporation 401(k) Plan, sponsored by AECOM (EIN 94-1381538, plan 001). Accounts moved with them, so that plan is the one to contact.

Plan number
001Employer EIN 26-1320627
Participants (2009)
12,872
Net assets (2009)
$868 million
Plan administrator
Urs E&c Holdings, Inc.
P.O. Box 73
Boise, ID 83729
(208) 386-5000As filed for 2010
In effect since
January 1, 1986
Year by year, 2009 to 2010
Plan yearParticipantsNet assetsRecordkeeper
20100$0not listed
200912,872$868 millionnot listed

Plans that moved to another employer

PlanNow sponsored bySince
Amentum 401(k) Retirement PlanAmentum Services, Inc.2016
Waste Isolation Pilot Plant Savings PlanSalado Isolation Mining Contractors, LLC2024
Waste Isolation Pilot Plant Pension PlanSalado Isolation Mining Contractors, LLC2023

These plans once filed under Amentum Nuclear & Environment Holdings's tax ID and are now filed by another employer, usually after a sale or spin-off. Accounts moved with them.

If you had money in one of these plans

  1. Call Milliman, which runs the Urs Government Services Group Pension 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.
  2. Or call the plan administrator listed on the plan below ((301) 944-3100). That number was filed for 2024; ask for the benefits or retirement plan office.
  3. 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.
  4. 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

Sources: U.S. Department of Labor, Form 5500 datasets and PBGC trusteed plans. How we read them.

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