401(k) · DOL Form 5500 · 2024
Mercury Systems, Inc. 401(k) Plan
Data updated 2026-08-25
- $476M
- Total assets Above avg plan size
- 2,388
- Participants Above avg headcount
- 97th
- Percentile by assets National rank
- $199,174
- Avg per participant Above avg balance/head
Official DOL plan name: Mercury Employees Retirement Investment Trust · Sponsored by Mercury Systems, Inc. · Massachusetts · Professional & Technical Services
$476M in assets, 2,388 participants
Mercury Systems, Inc.'s Mercury Employees Retirement Investment Trust reported $476M in total assets and 2,388 participants in its 2024 DOL Form 5500 filing, ranking in the 97th 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.
- #19,751 in Professional & Technical Services (20,173 peers)
Coverage in Massachusetts
Mercury Employees Retirement Investment Trust covers 2,388 participants in Massachusetts, 3.6x the typical Massachusetts plan (state average ~659 per filing). Assets: $476M.
- #19,751
- in Professional & Technical Services (20,173 peers)
- +8.0%
- assets growth YoY
- 4.8×
- vs typical plan assets (national mean)
Mercury Employees Retirement Investment Trust's outsized position by total assets
Mercury Employees Retirement Investment Trust vs every filed plan by assets
End-of-year total assets · plan year 2024 · DOL Form 5500
$475,626,417 Top 3% higher than 97% of 123,620 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2024
Mercury Employees Retirement Investment Trust's large-plan peer group by participant headcount
Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Mercury Employees Retirement Investment Trust lands in the large band (2,388 participants).
What changed between DOL Form 5500 filings
plan year 2023 → plan year 2024
- Mercury Employees Retirement Investment Trust reported net income fell from $71M in the plan year 2023 filing to $35M in the plan year 2024 filing.
- Mercury Employees Retirement Investment Trust end-of-year assets rose from $440M in the plan year 2023 filing to $476M in the plan year 2024 filing.
- Mercury Employees Retirement Investment Trust reported participants rose from 2,337 in the plan year 2023 filing to 2,388 in the plan year 2024 filing.
EBSA filing schedule strip
Filing strip 042741391 · Mercury Systems, Inc. PY 2024 · 401(k)
Mercury Employees Retirement Investment Trust · $476M · 2,388 · 97th
- PART $476M
- PART 2,388
- PART 97th
- PART 401(k)
- PART near Otis Retirement Savings Plan
- PART ind #19751
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 →
Mercury Employees Retirement Investment Trust in the asset neighbourhood
Massachusetts filing particulars
| Total Assets (Beginning of Year) | $440M |
|---|---|
| Net Assets (End of Year) | $476M |
| Net Income | $35M |
| Employer EIN | 042741391 |
| Plan Effective Date | 1987-07-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Mercury Systems, Inc.)
Sponsor-wide plan assets over time
All Mercury Systems, Inc. plans reported in each filing year
- Latest sponsor-wide plan assets
- $476M 28.65889058120154% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 2,028 | $370M |
| 2023 | 1 | 2,337 | $440M |
| 2024 | 1 | 2,388 | $476M |
Nearby 401(k) Plans in Massachusetts
Peer 401(k) plans, same state, same plan type, ranked by total assets.
- 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
Mercury Employees Retirement Investment Trust's out-of-state 401(k) peers by assets and headcount
Outside Massachusetts, the nearest 401(k) by assets is Otis Retirement Savings Plan in CT ($476M); by covered participants it is Ardent Mills, LLC Retirement Savings Plan (for Salaried Employees) in CO (2,388 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($476M here).
- Otis Retirement Savings Plan (CT) $476M · 4,309
- Cleco Power LLC 401(k) Savings & Investment Plan (LA) $476M · 1,355
- M. C. Dean, Inc. 401(k) Plan (VA) $475M · 5,425
- Growmark Member Cooperative 401(k) Savings Plan (IL) $475M · 7,332
Similar participant headcount
Nearest other-state filings by covered participants (2,388 participants); asset peers above are excluded.
- Ardent Mills, LLC Retirement Savings Plan (for Salaried Employees) (CO) 2,388 · 0 off
- Southwest Gas Corporation Employees' Investment Plan (NV) 2,387 · 1 off
- Randolph-Brooks Federal Credit Union 401(k) Plan (TX) 2,389 · 1 off
- Build-a-Bear Workshop, Inc. Employee Savings Trust (MO) 2,387 · 1 off
DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.