401(k) · DOL Form 5500 · 2024
Massachusetts Mutual Life Insurance Company 401(k) Plan
Data updated 2026-08-25
- $4.3B
- Total assets Very large vs avg
- 13,502
- Participants Very large workforce
- 100th
- Percentile by assets National rank
- $320,739
- Avg per participant High balance/head
Official DOL plan name: Massmutual Thrift Plan · Sponsored by Massachusetts Mutual Life Insurance Company · Massachusetts · Finance & Insurance
$4.3B in assets, 13,502 participants
Massachusetts Mutual Life Insurance Company's Massmutual Thrift Plan reported $4.3B in total assets and 13,502 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.
- #8,486 in Finance & Insurance (8,549 peers)
Coverage in Massachusetts
Massmutual Thrift Plan covers 13,502 participants in Massachusetts, 21x the typical Massachusetts plan (state average ~659 per filing). Assets: $4.3B.
- #8,486
- in Finance & Insurance (8,549 peers)
- +10.0%
- assets growth YoY
- 43×
- vs typical plan assets (national mean)
Massmutual Thrift Plan's outsized position by total assets
Massmutual Thrift Plan vs every filed plan by assets
End-of-year total assets · plan year 2024 · DOL Form 5500
$4,330,613,063 Highest reported value at or above every one 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
Massmutual Thrift 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. Massmutual Thrift Plan is a mega filing (13,502 participants), the rightmost band on the breakdown.
What changed between DOL Form 5500 filings
plan year 2023 → plan year 2024
- Massmutual Thrift Plan reported net income fell from $388M in the plan year 2023 filing to $315M in the plan year 2024 filing.
- Massmutual Thrift Plan end-of-year assets rose from $3.9B in the plan year 2023 filing to $4.3B in the plan year 2024 filing.
- Massmutual Thrift Plan reported participants fell from 14,565 in the plan year 2023 filing to 13,502 in the plan year 2024 filing.
Plan-year Form 5500 strip
Filing strip 041590850 · Massachusetts Mutual Life Insurance Company PY 2024 · 401(k)
Massmutual Thrift Plan · $4.3B · 13,502 · 100th
- BOOK $4.3B
- BOOK 13,502
- BOOK 100th
- BOOK 401(k)
- BOOK near H-E-B Savings & Retirement Plan
- BOOK ind #8486
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 Finance & Insurance retirement plans → · Plans in Massachusetts →
Massmutual Thrift Plan in the asset neighbourhood
Massachusetts filing particulars
| Total Assets (Beginning of Year) | $3.9B |
|---|---|
| Net Assets (End of Year) | $4.3B |
| Net Income | $315M |
| Employer EIN | 041590850 |
| Plan Effective Date | 1974-07-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Massachusetts Mutual Life Insurance Company)
Sponsor-wide plan assets over time
All Massachusetts Mutual Life Insurance Company plans reported in each filing year
- Latest sponsor-wide plan assets
- $7.0B 12.184255137909904% vs 2022
- 2024 filing year
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 4 | 30,601 | $6.2B |
| 2023 | 4 | 29,481 | $6.7B |
| 2024 | 4 | 27,323 | $7.0B |
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
Scale composition for Massmutual Thrift Plan
Massmutual Thrift Plan reports $4.3B in end-of-year assets across 13,502 participants (0.035% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.014% of 93,925,755 covered participants) - about $320,739 per participant (2.3x the national average assets-per-participant) . Net income for plan year 2024 was $315M.
This plan identity (EIN 041590850, plan #004) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $3.6B to $4.3B (+22.0%) while covered participants moved from 15,229 to 13,502 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 15,229 | $3.6B | Open filing |
| 2023 | 14,565 | $3.9B | Open filing |
| 2024 · index core | 13,502 | $4.3B | This page |
The same sponsor also keeps 2 other index-core plans on PlainRetire:
- Massmutual Pension Plan (Defined Benefit (Pension), $2.5B, 13,404 participants)
- Massachusetts Mutual Life Insurance Company Agent Pension Plan (Money Purchase, $145M, 351 participants)
Massmutual Thrift Plan's out-of-state 401(k) peers by assets and headcount
Outside Massachusetts, the nearest 401(k) by assets is H-E-B Savings & Retirement Plan in TX ($4.3B); by covered participants it is Smithfield Foods, Inc. Bargaining 401(k) Plan in VA (13,513 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($4.3B here).
- H-E-B Savings & Retirement Plan (TX) $4.3B · 104,613
- Koch Employees' Savings Plan (KS) $4.3B · 11,423
- Cbre 401(k) Plan (TX) $4.3B · 36,834
- Rbc- U.S.a. Retirement and Savings Plan (MN) $4.3B · 10,926
Similar participant headcount
Nearest other-state filings by covered participants (13,502 participants); asset peers above are excluded.
- Smithfield Foods, Inc. Bargaining 401(k) Plan (VA) 13,513 · 11 off
- Avis Budget Group, Inc. Employee Savings Plan (NJ) 13,513 · 11 off
- Guitar Center, Inc. 401(k) Plan (CA) 13,469 · 33 off
- Abb Inc. Retirement Savings Plan (NC) 13,559 · 57 off
DOL Form 5500 plan year 2024. Asset totals can differ widely at the same headcount; neither axis is a quality rating.