401(k) · DOL Form 5500 · 2022

Immunogen, Inc. 401(k) Plan

Data updated 2026-08-25

$58M
Total assets Below avg plan size
106
Participants Small participant base
89th
Percentile by assets National rank
$551,800
Avg per participant High balance/head
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Official DOL plan name: Immunogen, Inc. 401(k) Plan and Trust · Sponsored by Immunogen, Inc. · Massachusetts · Professional & Technical Services

$58M in assets, 106 participants

Immunogen, Inc.'s Immunogen, Inc. 401(k) Plan and Trust reported $58M in total assets and 106 participants in its 2022 DOL Form 5500 filing, ranking in the 89th 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.

  • #19,476 in Professional & Technical Services (21,562 peers)

Coverage in Massachusetts

Immunogen, Inc. 401(k) Plan and Trust covers 106 participants in Massachusetts, about 16% of the average Massachusetts filer (state average ~659 per filing). Assets: $58M.

#19,476
in Professional & Technical Services (21,562 peers)
-12.7%
assets change YoY
0.6×
vs typical plan assets (national mean)

The plan reported a net loss of $9M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.

Immunogen, Inc. 401(k) Plan and Trust's outsized position by total assets

Immunogen, Inc. 401(k) Plan and Trust vs every filed plan by assets

End-of-year total assets · plan year 2022 · DOL Form 5500

$58,490,751 Top 11% higher than 89% of 139,123 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 2022

Immunogen, Inc. 401(k) Plan and Trust among mid-size filed plans by headcount

Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Immunogen, Inc. 401(k) Plan and Trust sits mid-pack in the medium band (106 participants).

Published 5500 schedule card

Filing strip 042726691 · Immunogen, Inc. PY 2022 · 401(k)

Immunogen, Inc. 401(k) Plan and Trust · $58M · 106 · 89th

  • PCT $58M
  • EIN 106
  • RANK 89th
  • PHOTO 401(k)
  • IND near Summit Radiology, P.C. Profit Sharing Plan
  • EOY ind #19476

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 →

Immunogen, Inc. 401(k) Plan and Trust in the asset neighbourhood

Commercial Trailer Leasing, Inc. Employee Stock Ownership 401(k) PlanCommercial Trailer Leasing, …$59MImmunogen, Inc. 401(k) Plan and TrustImmunogen, Inc. 401(k) Plan …$58MSummit Radiology, P.C. Profit Sharing PlanSummit Radiology, P.C. Profi…$58MBarrette Outdoor Living 401(k) Retirement Savings PlanBarrette Outdoor Living 401(…$58MBaton Rouge Orthopaedic Clinic, LLC Profit Sharing Plan and TrustBaton Rouge Orthopaedic Clin…$58M
End-of-year total assets ($M) among Immunogen, Inc. 401(k) Plan and Trust and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2022.

Massachusetts filing particulars

Total Assets (Beginning of Year)$67M
Net Assets (End of Year)$58M
Net Income-$9M
Employer EIN042726691
Plan Effective Date1990-09-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Immunogen, Inc.)

Sponsor-wide plan assets over time

All Immunogen, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$82M 39.855092645331226% vs 2022
2024 filing year
$50M$60M$70M$80M$90M 202220232024 $58.5M $81.8M ▲ +39.9%
Year Plans Participants Total Assets
2022 1 106 $58M
2023 1 276 $73M
2024 1 295 $82M

Nearby 401(k) Plans in Massachusetts

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

Immunogen, Inc. 401(k) Plan and Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants Scatter plot of 6 data points. -200000200004000060000 -100102030 Total assets ($B) Participants Immunogen, Inc. 401(k) Plan and Trust, Total assets ($B): 0.058490751 · Participants: 106Immunogen, Inc. 401(k) Plan and TrustFidelity Retirement Savings Plan, Total assets ($B): 22.953563448 · Participants: 52036Fidelity Retirement Savings PlanLiberty Mutual 401(k) Plan, Total assets ($B): 8.79802945 · Participants: 32843Liberty Mutual 401(k) PlanMassachusetts Institute of Technology Supplemental 401(k) Plan, Total assets ($B): 5.810585521 · Participants: 13690Massachusetts Institute of Technology Supplemental 401(k) PlanPhilips North America 401(k) Plan, Total assets ($B): 5.180251859 · Participants: 19750Philips North America 401(k) PlanBoston Scientific Corporation 401(k) Retirement Savings Plan, Total assets ($B): 4.853752256 · Participants: 18359Boston Scientific Corporation 401(k) Retirement Savings Plan
Immunogen, Inc. 401(k) Plan and Trust vs. nearby 401(k) plans in Massachusetts, assets vs. participants
Compare Immunogen, Inc. 401(k) Plan and Trust side-by-side with 3 peers →

Immunogen, Inc. 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 Summit Radiology, P.C. Profit Sharing Plan in IN ($58M); by covered participants it is Integrated Laboratory Systems, LLC 401(k) Plan in NC (106 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (106 participants); asset peers above are excluded.

DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

Frequently Asked Questions

How did Immunogen, Inc. 401(k) Plan and Trust assets move in 2022? ▼
Immunogen, Inc. 401(k) Plan and Trust pulled back noticeably - down 12.7% during 2022, from $67M to $58M. Reported net income was -$9M.
How have Immunogen, Inc. plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Immunogen, Inc.'s sponsor-wide assets grew 39.9%, from $58M to $82M.
Where does Immunogen, Inc. 401(k) Plan and Trust rank by assets among Form 5500 filers? ▼
Immunogen, Inc. 401(k) Plan and Trust ranks in the 89th percentile by end-of-year assets among 139,126 plans that reported assets for plan year 2022 (in the top quartile of all filed plans by assets).
Which 401(k) plans are similar in size to Immunogen, Inc. 401(k) Plan and Trust? ▼
Among 401(k) plans in other states, the closest by assets is Summit Radiology, P.C. Profit Sharing Plan in IN ($58M, 98 participants).
Which 401(k) plans cover a similar participant headcount to Immunogen, Inc. 401(k) Plan and Trust? ▼
Among 401(k) plans in other states, the closest by covered participants is Integrated Laboratory Systems, LLC 401(k) Plan in NC (106 participants, N/A in assets).

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2022.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 042726691.

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.