401(k) · DOL Form 5500 · 2023

Immunogen, Inc. 401(k) Plan

Data updated 2026-08-11

$73M
Total assets
276
Participants
89th
Percentile by assets
$265,703
Avg per participant
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Official DOL plan name: Immunogen, Inc. 401(k) Plan and Trust · Sponsored by Immunogen, Inc. · Massachusetts · Professional & Technical Services

$73M in assets, 276 participants

Immunogen, Inc.'s Immunogen, Inc. 401(k) Plan and Trust reported $73M in total assets and 276 participants in its 2023 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.

  • 89th percentile by assets (of 127,072 plans)
  • #18,337 in Professional & Technical Services (20,321 peers)

Coverage in Massachusetts

Immunogen, Inc. 401(k) Plan and Trust covers 276 participants in Massachusetts, about 42% of the average Massachusetts filer (state average ~659 per filing). Assets: $73M.

$73M
total plan assets (2023 EOY)
276
covered participants
89th
percentile by assets (of 127,072 plans)
$265,703
avg assets per participant

Where Immunogen, Inc. 401(k) Plan and Trust sits by total assets

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

End-of-year total assets · plan year 2023 · DOL Form 5500

$73,333,902 Top 11% higher than 89% of 127,068 filed plans

This plan $0 $2,010,000,000 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

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • Immunogen, Inc. 401(k) Plan and Trust reported net income rose from -$9M in the plan year 2022 filing to $15M in the plan year 2023 filing.
  • Immunogen, Inc. 401(k) Plan and Trust reported participants rose from 106 in the plan year 2022 filing to 276 in the plan year 2023 filing.
  • Immunogen, Inc. 401(k) Plan and Trust end-of-year assets rose from $58M in the plan year 2022 filing to $73M in the plan year 2023 filing.

See the national 2022→2023 release diff →

State
Massachusetts
Industry
Professional & Technical Services

Participants vs Massachusetts filers

In Massachusetts, the average filing covers about 659 participants across 4,265 plans. Immunogen, Inc. 401(k) Plan and Trust reports 276 participants - about 42% of that state average ($73M EOY assets).

Massachusetts filing particulars

Total Assets (Beginning of Year)$58M
Net Assets (End of Year)$73M
Net Income$15M
Employer EIN042726691
Plan Effective Date1990-09-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Immunogen, Inc.)

$50M$60M$70M$80M$90M 202220232024 $58.5M $81.8M ▲ +39.9%
Total plan assets by year, all Immunogen, Inc. plans on file
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. -20000020000400006000080000 -10010203040 Total assets ($B) Participants Immunogen, Inc. 401(…, Total assets ($B): 0.073333902 · Participants: 276Immunogen, Inc. 401(…Fidelity Retirement …, Total assets ($B): 28.649852331 · Participants: 62289Fidelity Retirement …Liberty Mutual 401(k…, Total assets ($B): 10.556596852 · Participants: 37052Liberty Mutual 401(k…Massachusetts Instit…, Total assets ($B): 6.829912863 · Participants: 14094Massachusetts Instit…Boston Scientific Co…, Total assets ($B): 5.786107181 · Participants: 19881Boston Scientific Co…Philips North Americ…, Total assets ($B): 5.779286156 · Participants: 19120Philips North Americ…
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 →

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to Immunogen, Inc. 401(k) Plan and Trust by total assets, not by location.

Frequently Asked Questions

How did Immunogen, Inc. 401(k) Plan and Trust assets move in 2023? ▼
Immunogen, Inc. 401(k) Plan and Trust grew sharply - up 25.4% during 2023, from $58M to $73M. Reported net income was $15M.
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 127,072 plans that reported assets for plan year 2023 (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 Cbc/Cts 401(k) Plan in OH ($73M, 1,160 participants).

Next read for Immunogen, Inc. 401(k) Plan and Trust

Filing takeaways

Ways to act on Immunogen, Inc. 401(k) Plan and Trust's numbers.

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 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.