401(k) · DOL Form 5500 · 2024
The Middlesex Corporation 401(k) Plan
Data updated 2026-08-11
- $118M
- Total assets
- 821
- Participants
- 92nd
- Percentile by assets
- $143,603
- Avg per participant
Official DOL plan name: Middlesex Corporation Retirement Savings Plan · Sponsored by The Middlesex Corporation · Massachusetts · Construction
$118M in assets, 821 participants
The Middlesex Corporation's Middlesex Corporation Retirement Savings Plan reported $118M in total assets and 821 participants in its 2024 DOL Form 5500 filing, ranking in the 92nd 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.
- 92nd percentile by assets (of 123,622 plans)
- #8,138 in Construction (9,039 peers)
Where Middlesex Corporation Retirement Savings Plan sits by assets
Middlesex Corporation Retirement Savings Plan sits in the top 10% of all filed plans by assets, $118M for 821 participants (~$143,603/participant), up 14.8% in 2024.
- $118M
- total plan assets (2024 EOY)
- 821
- covered participants
- 92nd
- percentile by assets (of 123,622 plans)
- $143,603
- avg assets per participant
What changed between DOL Form 5500 filings
plan year 2023 → plan year 2024
- Middlesex Corporation Retirement Savings Plan end-of-year assets rose from $103M in the plan year 2023 filing to $118M in the plan year 2024 filing.
- Middlesex Corporation Retirement Savings Plan reported participants rose from 772 in the plan year 2023 filing to 821 in the plan year 2024 filing.
- Middlesex Corporation Retirement Savings Plan reported net income fell from $16M in the plan year 2023 filing to $15M in the plan year 2024 filing.
Middlesex Corporation Retirement Savings Plan vs the 2024 asset distribution
By assets, Middlesex Corporation Retirement Savings Plan outranks 92% of the 123,622 plans that filed a Form 5500 for the 2024 plan year, and holds roughly 1.2x the national average plan size of $100M (721 average participants).
Scale-class filing particulars (2024)
| Total Assets (Beginning of Year) | $103M |
|---|---|
| Net Assets (End of Year) | $118M |
| Net Income | $15M |
| Employer EIN | 042534615 |
| Plan Effective Date | 1992-10-16 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (The Middlesex Corporation)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 868 | $87M |
| 2023 | 1 | 772 | $103M |
| 2024 | 1 | 821 | $118M |
Nearby 401(k) Plans in Massachusetts
Peer 401(k) plans, same state, same plan type, ranked by total assets.
Middlesex Corporation Retirement Savings Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
- Fidelity Retirement Savings Plan $34.2B · 66,907
- Liberty Mutual 401(k) Plan $11.4B · 34,618
- Massachusetts Institute of Technology Supplemental 401(k) Plan $7.7B · 14,762
- Boston Scientific Corporation 401(k) Retirement Savings Plan $6.8B · 20,639
- State Street Salary Savings Program $6.5B · 12,777
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Middlesex Corporation Retirement Savings Plan by total assets, not by location.
- Construction Specialties, Inc. Ret Savings Plan (NJ) $118M · 765
- Las Vegas Sands Corp. 401(k) Retirement Plan (NV) $118M · 726
- Inari Medical, Inc. 401(k) Plan (CA) $118M · 1,193
- The Anchin, Block & Anchin Savings Plan (NY) $118M · 481
Frequently Asked Questions
How did Middlesex Corporation Retirement Savings Plan assets move in 2024? ▼
How have The Middlesex Corporation plan assets changed over time? ▼
Where does Middlesex Corporation Retirement Savings Plan rank by assets among Form 5500 filers? ▼
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Next read for Middlesex Corporation Retirement Savings…
Scale reading
Ways to act on Middlesex Corporation Retirement Savings Plan's numbers.
- By total assets, Middlesex Corporation Retirement Savings Plan ranks in the top 10% of all filed plans by assets. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in Massachusetts. Compare plans
- The Middlesex Corporation's sponsor-wide assets have grown 35.6% since 2022 across 3 plan years on file. More Construction plans