401(k) · DOL Form 5500 · 2024

Cox Engineering Company 401(k) Plan

Data updated 2026-08-25

$29M
Total assets Below avg plan size
155
Participants Small participant base
77th
Percentile by assets National rank
$187,209
Avg per participant Above avg balance/head
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Official DOL plan name: Cox Engineering Company 401(k) Plan and Trust · Sponsored by Cox Engineering Company · Massachusetts · Manufacturing

$29M in assets, 155 participants

Cox Engineering Company's Cox Engineering Company 401(k) Plan and Trust reported $29M in total assets and 155 participants in its 2024 DOL Form 5500 filing, ranking in the 77th 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.

  • #12,115 in Manufacturing (17,777 peers)

Coverage in Massachusetts

Cox Engineering Company 401(k) Plan and Trust covers 155 participants in Massachusetts, about 24% of the average Massachusetts filer (state average ~659 per filing). Assets: $29M.

#12,115
in Manufacturing (17,777 peers)
+27.1%
assets growth YoY
0.3×
vs typical plan assets (national mean)

Cox Engineering Company 401(k) Plan and Trust's outsized position by total assets

Cox Engineering Company 401(k) Plan and Trust vs every filed plan by assets

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

$29,017,392 Top 23% higher than 77% 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

Cox Engineering Company 401(k) Plan and Trust 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. Cox Engineering Company 401(k) Plan and Trust sits mid-pack in the medium band (155 participants).

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Cox Engineering Company 401(k) Plan and Trust reported participants rose from 113 in the plan year 2023 filing to 155 in the plan year 2024 filing.
  • Cox Engineering Company 401(k) Plan and Trust end-of-year assets rose from $23M in the plan year 2023 filing to $29M in the plan year 2024 filing.
  • Cox Engineering Company 401(k) Plan and Trust reported net income rose from $6M in the plan year 2023 filing to $6M in the plan year 2024 filing.

See the national 2023→2024 release diff →

DOL schedule card

Filing strip 042017923 · Cox Engineering Company PY 2024 · 401(k)

Cox Engineering Company 401(k) Plan and Trust · $29M · 155 · 77th

  • PCT $29M
  • PCT 155
  • PCT 77th
  • PCT 401(k)
  • PCT near Pubworx 401(k) Plan
  • PCT ind #12115

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 →

Cox Engineering Company 401(k) Plan and Trust in the asset neighbourhood

Cox Engineering Company 401(k) Plan and TrustCox Engineering Company 401(…$29MPubworx 401(k) Plan$29MShelterlogic Corp. 401(k) PlanShelterlogic Corp. 401(k) Pl…$29MConlon Construction Company 401(k) Profit Sharing PlanConlon Construction Company …$29MAnglogold Ashanti North America 401(k) PlanAnglogold Ashanti North Amer…$29M
End-of-year total assets ($M) among Cox Engineering Company 401(k) Plan and Trust and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Massachusetts filing particulars

Total Assets (Beginning of Year)$23M
Net Assets (End of Year)$29M
Net Income$6M
Employer EIN042017923
Plan Effective Date1981-11-27
Filing StatusFILING RECEIVED

Sponsor Plan History (Cox Engineering Company)

Sponsor-wide plan assets over time

All Cox Engineering Company plans reported in each filing year

Latest sponsor-wide plan assets
$29M 72.60204793902544% vs 2022
2024 filing year
$15M$20M$25M$30M$35M 202220232024 $16.8M $29M ▲ +72.6%
Year Plans Participants Total Assets
2022 1 95 $17M
2023 1 113 $23M
2024 1 155 $29M

Nearby 401(k) Plans in Massachusetts

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

Cox Engineering Company 401(k) Plan and Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Cox Engineering Company 401(k) Plan and Trust, Total assets ($B): 0.029017392 · Participants: 155Cox Engineering Company 401(k) Plan and TrustFidelity Retirement Savings Plan, Total assets ($B): 34.201609937 · Participants: 66907Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 11.352606499 · Participants: 34618Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 7.720373045 · Participants: 14762Massachusetts Institute of Technology Supplemental 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 6.775289067 · Participants: 20639Boston Scientific Corporation 401(k) Retirement Savings PlanState Street Salary Savings Program, Total assets ($B): 6.532301643 · Participants: 12777State Street Salary Savings Program
Cox Engineering Company 401(k) Plan and Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Cox Engineering Company 401(k) Plan and Trust side-by-side with 3 peers →

Cox Engineering Company 401(k) Plan and Trust's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Pubworx 401(k) Plan in NY ($29M); by covered participants it is Cass, Inc. 401(k) Profit Sharing Plan in CA (155 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($29M here).

Similar participant headcount

Nearest other-state filings by covered participants (155 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 Cox Engineering Company 401(k) Plan and Trust assets move in 2024? ▼
Cox Engineering Company 401(k) Plan and Trust grew sharply - up 27.1% during 2024, from $23M to $29M. Reported net income was $6M.
How have Cox Engineering Company plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Cox Engineering Company's sponsor-wide assets grew 72.6%, from $17M to $29M.
Where does Cox Engineering Company 401(k) Plan and Trust rank by assets among Form 5500 filers? ▼
Cox Engineering Company 401(k) Plan and Trust ranks in the 77th 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 Cox Engineering Company 401(k) Plan and Trust? ▼
Among 401(k) plans in other states, the closest by assets is Pubworx 401(k) Plan in NY ($29M, 133 participants).
Which 401(k) plans cover a similar participant headcount to Cox Engineering Company 401(k) Plan and Trust? ▼
Among 401(k) plans in other states, the closest by covered participants is Cass, Inc. 401(k) Profit Sharing Plan in CA (155 participants, N/A 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 042017923.

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.