401(k) · DOL Form 5500 · 2023

Radiation Monitoring Devices, Inc. 401(k) Plan

Data updated 2026-08-25

$19M
Total assets Small plan by assets
92
Participants Small participant base
71st
Percentile by assets National rank
$201,129
Avg per participant Above avg balance/head
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Official DOL plan name: Dynasil Companies 401(k) Plan · Sponsored by Radiation Monitoring Devices, Inc. · Massachusetts · Manufacturing

$19M in assets, 92 participants

Radiation Monitoring Devices, Inc.'s Dynasil Companies 401(k) Plan reported $19M in total assets and 92 participants in its 2023 DOL Form 5500 filing, ranking in the 71st 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.

  • #11,354 in Manufacturing (18,722 peers)

Radiation Monitoring Devices, Inc. multi-year trail

Radiation Monitoring Devices, Inc.'s plans moved +20.9% in assets from 2022 to 2024; this filing shows Dynasil Companies 401(k) Plan at $19M / 92 participants.

#11,354
in Manufacturing (18,722 peers)
+10.7%
assets growth YoY

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

Dynasil Companies 401(k) Plan vs every filed plan by assets

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

$18,503,853 Top 29% higher than 71% 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

Dynasil Companies 401(k) Plan among smaller filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Dynasil Companies 401(k) Plan is a small filing (92 participants) on this national headcount ladder.

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Dynasil Companies 401(k) Plan reported net income rose from -$8M in the plan year 2022 filing to $2M in the plan year 2023 filing.
  • Dynasil Companies 401(k) Plan end-of-year assets rose from $17M in the plan year 2022 filing to $19M in the plan year 2023 filing.
  • Dynasil Companies 401(k) Plan reported participants fell from 93 in the plan year 2022 filing to 92 in the plan year 2023 filing.

See the national 2022→2023 release diff →

EBSA filing schedule strip

Filing strip 262897516 · Radiation Monitoring Devices, Inc. PY 2023 · 401(k)

Dynasil Companies 401(k) Plan · $19M · 92 · 71st

  • TYPE $19M
  • NET 92
  • BOOK 71st
  • VS-ST 401(k)
  • BOY near California Supply, Inc. 401(k) Profit Sharing Plan
  • SCH ind #11354

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 Massachusetts →

Dynasil Companies 401(k) Plan in the asset neighbourhood

Dynasil Companies 401(k) Plan$19MCalifornia Supply, Inc. 401(k) Profit Sharing PlanCalifornia Supply, Inc. 401(…$19MNexion Health, Inc. 401(k) Plan and TrustNexion Health, Inc. 401(k) P…$19MPhysician's Computer Company 401(k) Ps PlanPhysician's Computer Company…$19MNaval Systems, Inc 401(k) PlanNaval Systems, Inc 401(k) Pl…$19M
End-of-year total assets ($M) among Dynasil Companies 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Radiation Monitoring Devices, Inc. multi-year asset trail

Sponsor-wide plan assets over time

All Radiation Monitoring Devices, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$20M 20.900141791600753% vs 2022
2024 filing year
$16M$18M$20M$22M 202220232024 $16.7M $20.2M ▲ +20.9%
Year Plans Participants Total Assets
2022 1 93 $17M
2023 1 92 $19M
2024 1 83 $20M

Radiation Monitoring Devices, Inc. filing trail (2023)

Total Assets (Beginning of Year)$17M
Net Assets (End of Year)$19M
Net Income$2M
Employer EIN262897516
Plan Effective Date1975-07-01
Filing StatusFILING RECEIVED

Nearby 401(k) Plans in Massachusetts

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

Dynasil Companies 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Dynasil Companies 401(k) Plan, Total assets ($B): 0.018503853 · Participants: 92Dynasil Companies 401(k) 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
Dynasil Companies 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Dynasil Companies 401(k) Plan side-by-side with 3 peers →

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

Outside Massachusetts, the nearest 401(k) by assets is California Supply, Inc. 401(k) Profit Sharing Plan in CA ($19M); by covered participants it is Melanson, P.C. 401(k) Plan in NH (92 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($19M here).

Similar participant headcount

Nearest other-state filings by covered participants (92 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 Dynasil Companies 401(k) Plan assets move in 2023? ▼
Dynasil Companies 401(k) Plan grew at a solid clip - up 10.7% during 2023, from $17M to $19M. Reported net income was $2M.
How have Radiation Monitoring Devices, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Radiation Monitoring Devices, Inc.'s sponsor-wide assets grew 20.9%, from $17M to $20M.
Which 401(k) plans are similar in size to Dynasil Companies 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is California Supply, Inc. 401(k) Profit Sharing Plan in CA ($19M, 89 participants).
Which 401(k) plans cover a similar participant headcount to Dynasil Companies 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Melanson, P.C. 401(k) Plan in NH (92 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 262897516.

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.