401(k) · DOL Form 5500 · 2023

Mercury Systems, Inc. 401(k) Plan

Data updated 2026-08-25

$440M
Total assets Above avg plan size
2,337
Participants Above avg headcount
97th
Percentile by assets National rank
$188,480
Avg per participant Above avg balance/head
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Official DOL plan name: Mercury Employees Retirement Investment Trust · Sponsored by Mercury Systems, Inc. · Massachusetts · Professional & Technical Services

$440M in assets, 2,337 participants

Mercury Systems, Inc.'s Mercury Employees Retirement Investment Trust reported $440M in total assets and 2,337 participants in its 2023 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.

  • #19,913 in Professional & Technical Services (20,321 peers)

Coverage in Massachusetts

Mercury Employees Retirement Investment Trust covers 2,337 participants in Massachusetts, 3.5x the typical Massachusetts plan (state average ~659 per filing). Assets: $440M.

#19,913
in Professional & Technical Services (20,321 peers)
+19.2%
assets growth YoY
4.4×
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 2023 · DOL Form 5500

$440,477,387 Top 3% higher than 97% 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

Mercury Employees Retirement Investment Trust's large-plan peer group by participant headcount

Plan-year 2023 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 (2,337 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Mercury Employees Retirement Investment Trust reported net income rose from -$51M in the plan year 2022 filing to $71M in the plan year 2023 filing.
  • Mercury Employees Retirement Investment Trust end-of-year assets rose from $370M in the plan year 2022 filing to $440M in the plan year 2023 filing.
  • Mercury Employees Retirement Investment Trust reported participants rose from 2,028 in the plan year 2022 filing to 2,337 in the plan year 2023 filing.

See the national 2022→2023 release diff →

DOL schedule card

Filing strip 042741391 · Mercury Systems, Inc. PY 2023 · 401(k)

Mercury Employees Retirement Investment Trust · $440M · 2,337 · 97th

  • IND $440M
  • EOY 2,337
  • 5500 97th
  • ASSETS 401(k)
  • PCT near Farm Bureau 401(k) Savings Plan
  • EIN ind #19913

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

Toshiba Tec U.S. Employees' 401(k) Savings PlanToshiba Tec U.S. Employees' …$441MFarm Bureau 401(k) Savings PlanFarm Bureau 401(k) Savings P…$441MMercury Employees Retirement Investment TrustMercury Employees Retirement…$440MThe Mohegan Retirement and 401(k) PlanThe Mohegan Retirement and 4…$440MDe Lage Landen Financial Services, Inc. Retirement Savings PlanDe Lage Landen Financial Ser…$440M
End-of-year total assets ($M) among Mercury Employees Retirement Investment Trust and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Massachusetts filing particulars

Total Assets (Beginning of Year)$370M
Net Assets (End of Year)$440M
Net Income$71M
Employer EIN042741391
Plan Effective Date1987-07-01
Filing StatusFILING 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
$350M$400M$450M$500M 202220232024 $370M $476M ▲ +28.7%
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.

Mercury Employees Retirement Investment Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Mercury Employees Retirement Investment Trust, Total assets ($B): 0.440477387 · Participants: 2337Mercury Employees Retirement Investment TrustFidelity 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
Mercury Employees Retirement Investment Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Mercury Employees Retirement Investment Trust side-by-side with 3 peers →

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 Farm Bureau 401(k) Savings Plan in IA ($441M); by covered participants it is Playcore 401(k) Plan in TN (2,336 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($440M here).

Similar participant headcount

Nearest other-state filings by covered participants (2,337 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 Mercury Employees Retirement Investment Trust assets move in 2023? ▼
Mercury Employees Retirement Investment Trust grew sharply - up 19.2% during 2023, from $370M to $440M. Reported net income was $71M.
How have Mercury Systems, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Mercury Systems, Inc.'s sponsor-wide assets grew 28.7%, from $370M to $476M.
Where does Mercury Employees Retirement Investment Trust rank by assets among Form 5500 filers? ▼
Mercury Employees Retirement Investment Trust ranks in the 97th percentile by end-of-year assets among 127,072 plans that reported assets for plan year 2023 (in the top 5% of all filed plans by assets).
Which 401(k) plans are similar in size to Mercury Employees Retirement Investment Trust? ▼
Among 401(k) plans in other states, the closest by assets is Farm Bureau 401(k) Savings Plan in IA ($441M, 2,107 participants).
Which 401(k) plans cover a similar participant headcount to Mercury Employees Retirement Investment Trust? ▼
Among 401(k) plans in other states, the closest by covered participants is Playcore 401(k) Plan in TN (2,336 participants, $119M 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 042741391.

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.