401(k) · DOL Form 5500 · 2023

Mevion Medical Systems Inc. 401(k) Plan

Data updated 2026-08-25

$17M
Total assets Small plan by assets
172
Participants Small participant base
69th
Percentile by assets National rank
$97,894
Avg per participant Below avg balance/head
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Official DOL plan name: Mevion Medical Systems Inc. 401(k) Profit Sharing Plan · Sponsored by Mevion Medical Systems Inc. · Massachusetts · Professional & Technical Services

$17M in assets, 172 participants

Mevion Medical Systems Inc.'s Mevion Medical Systems Inc. 401(k) Profit Sharing Plan reported $17M in total assets and 172 participants in its 2023 DOL Form 5500 filing, ranking in the 69th 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.

  • #13,987 in Professional & Technical Services (20,321 peers)

Coverage in Massachusetts

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan covers 172 participants in Massachusetts, about 26% of the average Massachusetts filer (state average ~659 per filing). Assets: $17M.

#13,987
in Professional & Technical Services (20,321 peers)
+33.8%
assets growth YoY

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan's outsized position by total assets

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$16,837,800 Top 31% higher than 69% of 127,068 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 2023

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan among mid-size filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Mevion Medical Systems Inc. 401(k) Profit Sharing Plan sits mid-pack in the medium band (172 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Mevion Medical Systems Inc. 401(k) Profit Sharing Plan reported net income rose from -$771K in the plan year 2022 filing to $4M in the plan year 2023 filing.
  • Mevion Medical Systems Inc. 401(k) Profit Sharing Plan end-of-year assets rose from $13M in the plan year 2022 filing to $17M in the plan year 2023 filing.
  • Mevion Medical Systems Inc. 401(k) Profit Sharing Plan reported participants rose from 166 in the plan year 2022 filing to 172 in the plan year 2023 filing.

See the national 2022→2023 release diff →

Published 5500 schedule card

Filing strip 200794350 · Mevion Medical Systems Inc. PY 2023 · 401(k)

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan · $17M · 172 · 69th

  • VS-ST $17M
  • BOY 172
  • SCH 69th
  • EBSA 401(k)
  • PART near Nephrology Associates of Centr 401(k) Profit Sharing Plan & Trust
  • TYPE ind #13987

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 →

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan in the asset neighbourhood

Mevion Medical Systems Inc. 401(k) Profit Sharing PlanMevion Medical Systems Inc. …$17MNephrology Associates of Centr 401(k) Profit Sharing Plan & TrustNephrology Associates of Cen…$17MDallas Plastic Surgery Institute, Inc. 401(k) Profit Sharing PlanDallas Plastic Surgery Insti…$17MProfit Sharing Plan for Employees of the Cary CompanyProfit Sharing Plan for Empl…$17MParagon Energy Solutions LLC 401(k) PlanParagon Energy Solutions LLC…$17M
End-of-year total assets ($M) among Mevion Medical Systems Inc. 401(k) Profit Sharing Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Massachusetts filing particulars

Total Assets (Beginning of Year)$13M
Net Assets (End of Year)$17M
Net Income$4M
Employer EIN200794350
Plan Effective Date2006-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Mevion Medical Systems Inc.)

Sponsor-wide plan assets over time

All Mevion Medical Systems Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$20M 55.93700068441232% vs 2022
2024 filing year
$10M$15M$20M$25M 202220232024 $12.6M $19.6M ▲ +56.0%
Year Plans Participants Total Assets
2022 1 166 $13M
2023 1 172 $17M
2024 1 177 $20M

Nearby 401(k) Plans in Massachusetts

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

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Mevion Medical Systems Inc. 401(k) Profit Sharing Plan, Total assets ($B): 0.0168378 · Participants: 172Mevion Medical Systems Inc. 401(k) Profit Sharing PlanFidelity Retirement Savings Plan, Total assets ($B): 28.649852331 · Participants: 62289Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 10.556596852 · Participants: 37052Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 6.829912863 · Participants: 14094Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 5.786107181 · Participants: 19881Boston Scientific Corporation 401(k) Retirement Savings PlanPhilips North America 401(k) Plan, Total assets ($B): 5.779286156 · Participants: 19120Philips North America 401(k) Plan
Mevion Medical Systems Inc. 401(k) Profit Sharing Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Mevion Medical Systems Inc. 401(k) Profit Sharing Plan side-by-side with 3 peers →

Mevion Medical Systems Inc. 401(k) Profit Sharing Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Nephrology Associates of Centr 401(k) Profit Sharing Plan & Trust in FL ($17M); by covered participants it is Retail Capital LLC 401(k) Plan in MI (172 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (172 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Mevion Medical Systems Inc. 401(k) Profit Sharing Plan assets move in 2023? ▼
Mevion Medical Systems Inc. 401(k) Profit Sharing Plan surged - up 33.8% during 2023, from $13M to $17M. Reported net income was $4M.
How have Mevion Medical Systems Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Mevion Medical Systems Inc.'s sponsor-wide assets grew 55.9%, from $13M to $20M.
Which 401(k) plans are similar in size to Mevion Medical Systems Inc. 401(k) Profit Sharing Plan? ▼
Among 401(k) plans in other states, the closest by assets is Nephrology Associates of Centr 401(k) Profit Sharing Plan & Trust in FL ($17M, 131 participants).
Which 401(k) plans cover a similar participant headcount to Mevion Medical Systems Inc. 401(k) Profit Sharing Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Retail Capital LLC 401(k) Plan in MI (172 participants, N/A in assets).

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 200794350.

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.