401(k) · DOL Form 5500 · 2024

Commonwealth Fusion Systems LLC 401(k) Plan

Data updated 2026-08-25

$40M
Total assets Below avg plan size
589
Participants Below avg headcount
82nd
Percentile by assets National rank
$68,618
Avg per participant Below avg balance/head
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Official DOL plan name: Cfs 401(k) Plan · Sponsored by Commonwealth Fusion Systems LLC · Massachusetts · Professional & Technical Services

$40M in assets, 589 participants

Commonwealth Fusion Systems LLC's Cfs 401(k) Plan reported $40M in total assets and 589 participants in its 2024 DOL Form 5500 filing, ranking in the 82nd 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.

  • #16,562 in Professional & Technical Services (20,173 peers)

Where Cfs 401(k) Plan sits by assets

Cfs 401(k) Plan sits in the top quartile of all filed plans by assets, $40M for 589 participants (~$68,618/participant), up 94.1% in 2024.

#16,562
in Professional & Technical Services (20,173 peers)
+94.1%
assets growth YoY
0.4×
vs typical plan assets (national mean)

Cfs 401(k) Plan's outsized position by total assets

Cfs 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2024 · DOL Form 5500

$40,416,227 Top 18% higher than 82% of 123,620 filed plans

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2024

Cfs 401(k) Plan among mid-size filed plans by headcount

Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Cfs 401(k) Plan sits mid-pack in the medium band (589 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Cfs 401(k) Plan end-of-year assets rose from $21M in the plan year 2023 filing to $40M in the plan year 2024 filing.
  • Cfs 401(k) Plan reported net income rose from $12M in the plan year 2023 filing to $20M in the plan year 2024 filing.
  • Cfs 401(k) Plan reported participants rose from 371 in the plan year 2023 filing to 589 in the plan year 2024 filing.

See the national 2023→2024 release diff →

EBSA filing schedule strip

Filing strip 823262257 · Commonwealth Fusion Systems LLC PY 2024 · 401(k)

Cfs 401(k) Plan · $40M · 589 · 82nd

  • PHOTO $40M
  • PHOTO 589
  • PHOTO 82nd
  • PHOTO 401(k)
  • PHOTO near The Don Lee and Affiliates 401(k) Retirement Plan
  • PHOTO ind #16562

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Professional & Technical Services retirement plans → · Plans in Massachusetts →

Cfs 401(k) Plan in the asset neighbourhood

Cfs 401(k) Plan$40MThe Don Lee and Affiliates 401(k) Retirement PlanThe Don Lee and Affiliates 4…$40MOpn Architects, Inc. Profit Sharing PlanOpn Architects, Inc. Profit …$40MDallas Basketball Limited 401(k) PlanDallas Basketball Limited 40…$40MVan Eerden Savings and Retirement PlanVan Eerden Savings and Retir…$40M
End-of-year total assets ($M) among Cfs 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Scale-class filing particulars (2024)

Total Assets (Beginning of Year)$21M
Net Assets (End of Year)$40M
Net Income$20M
Employer EIN823262257
Plan Effective Date2021-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Commonwealth Fusion Systems LLC)

Sponsor-wide plan assets over time

All Commonwealth Fusion Systems LLC plans reported in each filing year

Latest sponsor-wide plan assets
$40M 345.31213984415047% vs 2022
2024 filing year
$0M$10M$20M$30M$40M$50M 202220232024 $9.08M $40.4M ▲ +345.2%
Year Plans Participants Total Assets
2022 1 156 $9M
2023 1 371 $21M
2024 1 589 $40M

Nearby 401(k) Plans in Massachusetts

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

Cfs 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Cfs 401(k) Plan, Total assets ($B): 0.040416227 · Participants: 589Cfs 401(k) PlanFidelity Retirement Savings Plan, Total assets ($B): 34.201609937 · Participants: 66907Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 11.352606499 · Participants: 34618Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 7.720373045 · Participants: 14762Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 6.775289067 · Participants: 20639Boston Scientific Corporation 401(k) Retirement Savings PlanState Street Salary Savings Program, Total assets ($B): 6.532301643 · Participants: 12777State Street Salary Savings Program
Cfs 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Cfs 401(k) Plan side-by-side with 3 peers →

Cfs 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is The Don Lee and Affiliates 401(k) Retirement Plan in MI ($40M); by covered participants it is Universal Waste Systems, Inc. 401(k) Plan in CA (589 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (589 participants); asset peers above are excluded.

DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Cfs 401(k) Plan assets move in 2024? ▼
Cfs 401(k) Plan surged - up 94.1% during 2024, from $21M to $40M. Reported net income was $20M.
How have Commonwealth Fusion Systems LLC plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Commonwealth Fusion Systems LLC's sponsor-wide assets grew 345.3%, from $9M to $40M.
Where does Cfs 401(k) Plan rank by assets among Form 5500 filers? ▼
Cfs 401(k) Plan ranks in the 82nd percentile by end-of-year assets among 123,622 plans that reported assets for plan year 2024 (in the top quartile of all filed plans by assets).
Which 401(k) plans are similar in size to Cfs 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is The Don Lee and Affiliates 401(k) Retirement Plan in MI ($40M, 297 participants).
Which 401(k) plans cover a similar participant headcount to Cfs 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Universal Waste Systems, Inc. 401(k) Plan in CA (589 participants, $12M in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2024.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 823262257.

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.