401(k) · DOL Form 5500 · 2024

Proton Energy Systems, Inc. 401(k) Plan

Data updated 2026-08-25

$28M
Total assets Below avg plan size
196
Participants Below avg headcount
76th
Percentile by assets National rank
$142,976
Avg per participant Near avg balance/head
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Official DOL plan name: Proton Energy Systems, Inc. 401(k) Plan · Sponsored by Proton Energy Systems, Inc. · Connecticut · Manufacturing

$28M in assets, 196 participants

Proton Energy Systems, Inc.'s Proton Energy Systems, Inc. 401(k) Plan reported $28M in total assets and 196 participants in its 2024 DOL Form 5500 filing, ranking in the 76th 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.

  • #11,967 in Manufacturing (17,777 peers)

Coverage in Connecticut

Proton Energy Systems, Inc. 401(k) Plan covers 196 participants in Connecticut, about 27% of the average Connecticut filer (state average ~718 per filing). Assets: $28M.

#11,967
in Manufacturing (17,777 peers)
+21.4%
assets growth YoY
0.3×
vs typical plan assets (national mean)

Proton Energy Systems, Inc. 401(k) Plan's outsized position by total assets

Proton Energy Systems, Inc. 401(k) Plan vs every filed plan by assets

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

$28,023,380 Top 24% higher than 76% 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

Proton Energy Systems, Inc. 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. Proton Energy Systems, Inc. 401(k) Plan sits mid-pack in the medium band (196 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Proton Energy Systems, Inc. 401(k) Plan end-of-year assets rose from $23M in the plan year 2023 filing to $28M in the plan year 2024 filing.
  • Proton Energy Systems, Inc. 401(k) Plan reported participants rose from 176 in the plan year 2023 filing to 196 in the plan year 2024 filing.
  • Proton Energy Systems, Inc. 401(k) Plan reported net income rose from $5M in the plan year 2023 filing to $5M in the plan year 2024 filing.

See the national 2023→2024 release diff →

EBSA filing schedule strip

Filing strip 611846104 · Proton Energy Systems, Inc. PY 2024 · 401(k)

Proton Energy Systems, Inc. 401(k) Plan · $28M · 196 · 76th

  • ASSETS $28M
  • ASSETS 196
  • ASSETS 76th
  • ASSETS 401(k)
  • ASSETS near Lanzatech Retirement Savings 401(k) Plan
  • ASSETS ind #11967

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 Manufacturing retirement plans → · Plans in Connecticut →

Proton Energy Systems, Inc. 401(k) Plan in the asset neighbourhood

Proton Energy Systems, Inc. 401(k) PlanProton Energy Systems, Inc. …$28MLanzatech Retirement Savings 401(k) PlanLanzatech Retirement Savings…$28MOnxmaps, Inc. 401(k) Plan$28MAlvin J. Wolff Profit Sharing PlanAlvin J. Wolff Profit Sharin…$28MJpi Retirement Plan$28M
End-of-year total assets ($M) among Proton Energy Systems, Inc. 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Connecticut filing particulars

Total Assets (Beginning of Year)$23M
Net Assets (End of Year)$28M
Net Income$5M
Employer EIN611846104
Plan Effective Date2004-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Proton Energy Systems, Inc.)

Sponsor-wide plan assets over time

All Proton Energy Systems, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$28M 50.96710186852319% vs 2022
2024 filing year
$15M$20M$25M$30M 202220232024 $18.6M $28M ▲ +51.0%
Year Plans Participants Total Assets
2022 1 144 $19M
2023 1 176 $23M
2024 1 196 $28M

Nearby 401(k) Plans in Connecticut

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

Proton Energy Systems, Inc. 401(k) Plan vs. nearby 401(k) plans in Connecticut, assets vs. participants Scatter plot of 6 data points. -50000050000100000150000 -20020406080 Total assets ($B) Participants Proton Energy Systems, Inc. 401(k) Plan, Total assets ($B): 0.02802338 · Participants: 196Proton Energy Systems, Inc. 401(k) PlanRtx Savings Plan, Total assets ($B): 58.647425 · Participants: 124876Rtx Savings PlanCiti Retirement Savings Plan, Total assets ($B): 23.241033081 · Participants: 78741Citi Retirement Savings PlanThe Hartford Investment and Savings Plan, Total assets ($B): 7.183243 · Participants: 18614The Hartford Investment and Savings PlanEversource 401(k) Plan, Total assets ($B): 4.046347175 · Participants: 10041Eversource 401(k) PlanXerox Corporation Savings Plan, Total assets ($B): 3.976943 · Participants: 9876Xerox Corporation Savings Plan
Proton Energy Systems, Inc. 401(k) Plan vs. nearby 401(k) plans in Connecticut, assets vs. participants
Compare Proton Energy Systems, Inc. 401(k) Plan side-by-side with 3 peers →

Proton Energy Systems, Inc. 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Connecticut, the nearest 401(k) by assets is Lanzatech Retirement Savings 401(k) Plan in IL ($28M); by covered participants it is Sai360 401(k) Savings Plan in IL (196 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($28M here).

Similar participant headcount

Nearest other-state filings by covered participants (196 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 Proton Energy Systems, Inc. 401(k) Plan assets move in 2024? ▼
Proton Energy Systems, Inc. 401(k) Plan grew sharply - up 21.4% during 2024, from $23M to $28M. Reported net income was $5M.
How have Proton Energy Systems, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Proton Energy Systems, Inc.'s sponsor-wide assets grew 51.0%, from $19M to $28M.
Where does Proton Energy Systems, Inc. 401(k) Plan rank by assets among Form 5500 filers? ▼
Proton Energy Systems, Inc. 401(k) Plan ranks in the 76th 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 Proton Energy Systems, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Lanzatech Retirement Savings 401(k) Plan in IL ($28M, 325 participants).
Which 401(k) plans cover a similar participant headcount to Proton Energy Systems, Inc. 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Sai360 401(k) Savings Plan in IL (196 participants, $55M 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 611846104.

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.