401(k) · DOL Form 5500 · 2024

Massachusetts Institute of Technology 401(k) Plan

Data updated 2026-08-25

$7.7B
Total assets Very large vs avg
14,762
Participants Very large workforce
100th
Percentile by assets National rank
$522,990
Avg per participant High balance/head
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Official DOL plan name: Massachusetts Institute of Technology Supplemental 401(k) Plan · Sponsored by Massachusetts Institute of Technology · Massachusetts · Educational Services

$7.7B in assets, 14,762 participants

Massachusetts Institute of Technology's Massachusetts Institute of Technology Supplemental 401(k) Plan reported $7.7B in total assets and 14,762 participants in its 2024 DOL Form 5500 filing, ranking in the 100th 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.

  • #3,633 in Educational Services (3,638 peers)

Coverage in Massachusetts

Massachusetts Institute of Technology Supplemental 401(k) Plan covers 14,762 participants in Massachusetts, 22x the typical Massachusetts plan (state average ~659 per filing). Assets: $7.7B.

#3,633
in Educational Services (3,638 peers)
+13.0%
assets growth YoY
77×
vs typical plan assets (national mean)

Massachusetts Institute of Technology Supplemental 401(k) Plan's outsized position by total assets

Massachusetts Institute of Technology Supplemental 401(k) Plan vs every filed plan by assets

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

$7,720,373,045 Highest reported value at or above every one 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

Massachusetts Institute of Technology Supplemental 401(k) Plan's mega-plan peer group by participant headcount

Plan-year 2024 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Massachusetts Institute of Technology Supplemental 401(k) Plan is a mega filing (14,762 participants), the rightmost band on the breakdown.

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Massachusetts Institute of Technology Supplemental 401(k) Plan end-of-year assets rose from $6.8B in the plan year 2023 filing to $7.7B in the plan year 2024 filing.
  • Massachusetts Institute of Technology Supplemental 401(k) Plan reported net income fell from $1.0B in the plan year 2023 filing to $891M in the plan year 2024 filing.
  • Massachusetts Institute of Technology Supplemental 401(k) Plan reported participants rose from 14,094 in the plan year 2023 filing to 14,762 in the plan year 2024 filing.

See the national 2023→2024 release diff →

Plan-year Form 5500 strip

Filing strip 042103594 · Massachusetts Institute of Technology PY 2024 · 401(k)

Massachusetts Institute of Technology Supplemental 401(k) Plan · $7.7B · 14,762 · 100th

  • ASSETS $7.7B
  • ASSETS 14,762
  • ASSETS 100th
  • ASSETS 401(k)
  • ASSETS near Amgen Retirement and Savings Plan
  • ASSETS ind #3633

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 Educational Services retirement plans → · Plans in Massachusetts →

Massachusetts Institute of Technology Supplemental 401(k) Plan in the asset neighbourhood

Massachusetts Institute of Technology Supplemental 401(k) PlanMassachusetts Institute of T…$7.7BAmgen Retirement and Savings PlanAmgen Retirement and Savings…$7.7BHumana Retirement Savings PlanHumana Retirement Savings Pl…$7.7BHdr, Inc. Best Plan and ESOP$7.7BPhillips 66 Savings Plan$7.7B
End-of-year total assets ($B) among Massachusetts Institute of Technology Supplemental 401(k) Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2024.

Massachusetts filing particulars

Total Assets (Beginning of Year)$6.8B
Net Assets (End of Year)$7.7B
Net Income$891M
Employer EIN042103594
Plan Effective Date1985-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Massachusetts Institute of Technology)

Sponsor-wide plan assets over time

All Massachusetts Institute of Technology plans reported in each filing year

Latest sponsor-wide plan assets
$13.6B 22.695725557542403% vs 2022
2024 filing year
$10B$11B$12B$13B$14B 202220232024 $11.1B $13.6B ▲ +22.7%
Year Plans Participants Total Assets
2022 2 25,525 $11.1B
2023 2 25,982 $12.2B
2024 2 27,295 $13.6B

Nearby 401(k) Plans in Massachusetts

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

Massachusetts Institute of Technology Supplemental 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. 020000400006000080000 010203040 Total assets ($B) Participants Massachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 7.720373045 · Participants: 14762Massachusetts Institute of Technology Supplemental 401(k) PlanFidelity 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) 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 ProgramPhilips North America 401(k) Plan, Total assets ($B): 6.366834511 · Participants: 18388Philips North America 401(k) Plan
Massachusetts Institute of Technology Supplemental 401(k) Plan vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Massachusetts Institute of Technology Supplemental 401(k) Plan side-by-side with 3 peers →

Scale composition for Massachusetts Institute of Technology Supplemental 401(k) Plan

Massachusetts Institute of Technology Supplemental 401(k) Plan reports $7.7B in end-of-year assets across 14,762 participants (0.063% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.016% of 93,925,755 covered participants) - about $522,990 per participant (3.8x the national average assets-per-participant) . Net income for plan year 2024 was $891M.

This plan identity (EIN 042103594, plan #005) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $5.8B to $7.7B (+32.9%) while covered participants moved from 13,690 to 14,762 . Single-year sparse filers cannot show that trail.

Plan year Participants EOY assets Filing
2022 13,690 $5.8B Open filing
2023 14,094 $6.8B Open filing
2024 · index core 14,762 $7.7B This page

The same sponsor also keeps 1 other index-core plan on PlainRetire:

Massachusetts Institute of Technology Supplemental 401(k) Plan's out-of-state 401(k) peers by assets and headcount

Outside Massachusetts, the nearest 401(k) by assets is Amgen Retirement and Savings Plan in CA ($7.7B); by covered participants it is Bloomberg L.P. 401(k) Plan in NY (14,760 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($7.7B here).

Similar participant headcount

Nearest other-state filings by covered participants (14,762 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 Massachusetts Institute of Technology Supplemental 401(k) Plan assets move in 2024? ▼
Massachusetts Institute of Technology Supplemental 401(k) Plan grew at a solid clip - up 13.0% during 2024, from $6.8B to $7.7B. Reported net income was $891M.
How have Massachusetts Institute of Technology plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Massachusetts Institute of Technology's sponsor-wide assets grew 22.7%, from $11.1B to $13.6B.
Where does Massachusetts Institute of Technology Supplemental 401(k) Plan rank by assets among Form 5500 filers? ▼
Massachusetts Institute of Technology Supplemental 401(k) Plan ranks in the 100th percentile by end-of-year assets among 123,622 plans that reported assets for plan year 2024 (among the largest 1% of all filed plans).
Which 401(k) plans are similar in size to Massachusetts Institute of Technology Supplemental 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by assets is Amgen Retirement and Savings Plan in CA ($7.7B, 12,355 participants).
Which 401(k) plans cover a similar participant headcount to Massachusetts Institute of Technology Supplemental 401(k) Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Bloomberg L.P. 401(k) Plan in NY (14,760 participants, $5.7B 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 042103594.

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.