PROTON ENERGY SYSTEMS, INC. 401(K) PLAN
ERISA Form 5500 plan record drawn from DOL EBSA — verify with linked source filings below.
PROTON ENERGY SYSTEMS, INC.
This 401(k) plan holds $28M in total assets and serves 196 participants as of 2024. It is sponsored by PROTON ENERGY SYSTEMS, INC. in Connecticut. The plan reported positive net income of $5M for the year.
What the Filing Says About PROTON ENERGY SYSTEMS, INC. 401(K) PLAN
PROTON ENERGY SYSTEMS, INC. 401(K) PLAN is a 401(k) retirement plan sponsored by PROTON ENERGY SYSTEMS, INC., headquartered in Connecticut. As of the 2024 Form 5500 filing, the plan reports $28M in total end-of-year assets and covers 196 participants across the Manufacturing industry. The sponsor's EIN on file with the U.S. Department of Labor is 611846104, and the plan has been effective since 2004-01-01. Its filing status is currently FILING RECEIVED.
Year over year, total assets moved from $23M at the beginning of 2024 to $28M at year-end — a gain of 21.4%. Net assets (after liabilities) closed the year at $28M, with reported net income of $5M driven by investment returns, contributions received, and benefit payments during the period. These figures reflect what the plan administrator certified on Schedule H or Schedule I of the Form 5500 annual return and can be compared against 2 prior plan-year filings from the same sponsor shown below.
Asset totals and participant counts reflect a single plan year snapshot and can change materially with market conditions, plan mergers, or workforce changes. Fields such as "net income" include both realized investment performance and contribution/distribution flows — a single-year figure does not by itself indicate plan health or participant outcomes. This page summarizes public DOL disclosures for research and educational purposes only and is not retirement, tax, legal, or financial advice. Before making decisions about your own retirement benefits or evaluating an employer's plan, verify the underlying filing directly via the DOL EFAST2 system and consult a qualified professional.
Financial Summary (2023)
| Total Assets (Beginning of Year) | $23M |
| Total Assets (End of Year) | $28M |
| Net Assets (End of Year) | $28M |
| Net Income | $5M |
| Plan Type | 401(k) |
| Employer EIN | 611846104 |
| Plan Effective Date | 2004-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (PROTON ENERGY SYSTEMS, INC.)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 144 | $19M |
| 2023 | 1 | 176 | $23M |
| 2024 | 1 | 196 | $28M |
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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.
Reference: IRS Publication 560 — Retirement Plans for Small Business, contribution-limit rules.
Reference: IRS Publication 590-B — Distributions from IRAs, RMD rules under SECURE Act 2.0.
Read our methodology — how this data is sourced, computed, and verified.