401(k) · DOL Form 5500 · 2023

Amentum Services, Inc. 401(k) Plan

Data updated 2026-08-11

$2.2B
Total assets
22,820
Participants
99th
Percentile by assets
$96,147
Avg per participant
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Official DOL plan name: Amentum 401(k) Retirement Plan · Sponsored by Amentum Services, Inc. · Virginia · Professional & Technical Services

$2.2B in assets, 22,820 participants

Amentum Services, Inc.'s Amentum 401(k) Retirement Plan reported $2.2B in total assets and 22,820 participants in its 2023 DOL Form 5500 filing, ranking in the 99th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

  • 99th percentile by assets (of 127,072 plans)
  • #20,250 in Professional & Technical Services (20,321 peers)

Coverage in Virginia

Amentum 401(k) Retirement Plan covers 22,820 participants in Virginia, 29x the typical Virginia plan (state average ~782 per filing). Assets: $2.2B.

$2.2B
total plan assets (2023 EOY)
22,820
covered participants
99th
percentile by assets (of 127,072 plans)
$96,147
avg assets per participant

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Amentum 401(k) Retirement Plan reported net income rose from -$343M in the plan year 2022 filing to $343M in the plan year 2023 filing.
  • Amentum 401(k) Retirement Plan reported participants rose from 15,670 in the plan year 2022 filing to 22,820 in the plan year 2023 filing.
  • Amentum 401(k) Retirement Plan end-of-year assets rose from $1.8B in the plan year 2022 filing to $2.2B in the plan year 2023 filing.

See the national 2022→2023 release diff →

State
Virginia
Industry
Professional & Technical Services

Participants vs Virginia filers

In Virginia, the average filing covers about 782 participants across 3,655 plans. Amentum 401(k) Retirement Plan reports 22,820 participants - 29x that state average ($2.2B EOY assets).

Virginia filing particulars

Total Assets (Beginning of Year)$1.8B
Net Assets (End of Year)$2.2B
Net Income$343M
Employer EIN271628265
Plan Effective Date2011-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Amentum Services, Inc.)

$1.6B$1.8B$2B$2.2B$2.4B$2.6B 202220232024 $1.85B $2.49B ▲ +34.6%
Total plan assets by year, all Amentum Services, Inc. plans on file
Year Plans Participants Total Assets
2022 1 15,670 $1.8B
2023 1 22,820 $2.2B
2024 1 31,017 $2.5B

Nearby 401(k) Plans in Virginia

Peer 401(k) plans, same state, same plan type, ranked by total assets.

Amentum 401(k) Retirement Plan vs. nearby 401(k) plans in Virginia, assets vs. participants

Amentum 401(k) Retirement Plan vs. nearby 401(k) plans in Virginia, assets vs. participants Scatter plot of 6 data points. 020000400006000080000100000120000 010203040 Total assets ($B) Participants Amentum 401(k) Retir…Northrop Grumman Sav…401(k) Pension PlanGeneral Dynamics Cor…Leidos, Inc. Retirem…Bae Systems Employee…
Amentum 401(k) Retirement Plan vs. nearby 401(k) plans in Virginia, assets vs. participants
Compare Amentum 401(k) Retirement Plan side-by-side with 3 peers →

Scale composition for Amentum 401(k) Retirement Plan

Amentum 401(k) Retirement Plan reports $2.2B in end-of-year assets across 22,820 participants (0.018% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.024% of 93,925,755 covered participants) - about $96,147 per participant (70% of the national average assets-per-participant) . Net income for plan year 2023 was $343M.

This plan identity (EIN 271628265, plan #001) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $1.8B to $2.5B (+34.7%) while covered participants moved from 15,670 to 31,017 . Single-year sparse filers cannot show that trail.

Plan year Participants EOY assets Filing
2022 15,670 $1.8B Open filing
2023 22,820 $2.2B This page
2024 · index core 31,017 $2.5B Open filing

The same sponsor also keeps 1 other index-core plan on PlainRetire:

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to Amentum 401(k) Retirement Plan by total assets, not by location.

Frequently Asked Questions

How did Amentum 401(k) Retirement Plan assets move in 2023? ▼
Amentum 401(k) Retirement Plan grew sharply - up 18.6% during 2023, from $1.8B to $2.2B. Reported net income was $343M.
How have Amentum Services, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Amentum Services, Inc.'s sponsor-wide assets grew 34.7%, from $1.8B to $2.5B.
Where does Amentum 401(k) Retirement Plan rank by assets among Form 5500 filers? ▼
Amentum 401(k) Retirement Plan ranks in the 99th percentile by end-of-year assets among 127,072 plans that reported assets for plan year 2023 (among the largest 1% of all filed plans).
Which 401(k) plans are similar in size to Amentum 401(k) Retirement Plan? ▼
Among 401(k) plans in other states, the closest by assets is Precision Castparts Corp. 401(k) Retirement Savings Plan in OR ($2.2B, 16,687 participants).

Next read for Amentum 401(k) Retirement Plan

Filing takeaways

Ways to act on Amentum 401(k) Retirement Plan's numbers.

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 271628265.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.