Civic Intelligence

Immunogen Inc.

Plan context: Immunogen Inc. 401(K) Plan and Trust

EIN 04-2726691 • Waltham, MA • 44 filings • 8 plans

830 Winter StreetWaltham, MA 02152
Current Snapshot

Latest Year

2025

2025 Participants

233

2025 Assets

$81,802,294

2025 Contributions

$10,024,631

Historical Graphs

Total Assets Over Time

Aggregate end-of-year assets by filing year, excluding zero-asset years

$81,802,294$40,901,147$0199920192024YearValue
$81,802,294Latest year 2024

Participants Over Time

Largest reported end-of-year plan headcount by filing year, used to avoid double-counting participants across overlapping plans

3451730199920132024YearValue
233Latest year 2024

Company Timeline

Year summaries and individual filings are combined here so you can stay in one place while moving across years and plan filings.

Year / FilingFilingsParticipantsAssetsContributionsContrib./Participant
202530$0$0-
Immunogen Inc. 401(K) Plan and Trust-0---
Immunogen Inc. Severance Pay Plan for All Employees-0---
Immunogen Inc. Welfare Benefit Plan-0---
20243233$81,802,294$10,024,631$43,024iApproximate average salary by contribution assumption: employee only about $1,075,604 at 4% or $717,069 at 6%; with 50% employer match about $717,069 at 4% or $478,046 at 6%; with 100% employer match about $537,802 at 4% or $358,535 at 6%.
Immunogen Inc. 401(K) Plan and Trust-225$81,802,294$10,024,631$44,554iApproximate average salary by contribution assumption: employee only about $1,113,848 at 4% or $742,565 at 6%; with 50% employer match about $742,565 at 4% or $495,044 at 6%; with 100% employer match about $556,924 at 4% or $371,283 at 6%.
Immunogen Inc. Welfare Benefit Plan-233---
Immunogen Inc. Severance Pay Plan for All Employees-233---
20233295$73,333,902$9,273,337$31,435iApproximate average salary by contribution assumption: employee only about $785,876 at 4% or $523,917 at 6%; with 50% employer match about $523,917 at 4% or $349,278 at 6%; with 100% employer match about $392,938 at 4% or $261,959 at 6%.
Immunogen Inc. 401(K) Plan and Trust-295$73,333,902$9,273,337$31,435iApproximate average salary by contribution assumption: employee only about $785,876 at 4% or $523,917 at 6%; with 50% employer match about $523,917 at 4% or $349,278 at 6%; with 100% employer match about $392,938 at 4% or $261,959 at 6%.
Immunogen Inc. Welfare Benefit Plan-282---
Immunogen Inc. Severance Pay Plan for All Employees-295---
20223277$58,490,751$7,534,765$27,201iApproximate average salary by contribution assumption: employee only about $680,033 at 4% or $453,355 at 6%; with 50% employer match about $453,355 at 4% or $302,237 at 6%; with 100% employer match about $340,016 at 4% or $226,678 at 6%.
Immunogen Inc. 401(K) Plan and Trust-276$58,490,751$7,534,765$27,300iApproximate average salary by contribution assumption: employee only about $682,497 at 4% or $454,998 at 6%; with 50% employer match about $454,998 at 4% or $303,332 at 6%; with 100% employer match about $341,248 at 4% or $227,499 at 6%.
Immunogen Inc. Severance Pay Plan for All Employees-277---
Immunogen Inc. Welfare Benefit Plan-259---
20211106$66,996,309$2,428,573$22,911iApproximate average salary by contribution assumption: employee only about $572,777 at 4% or $381,851 at 6%; with 50% employer match about $381,851 at 4% or $254,567 at 6%; with 100% employer match about $286,388 at 4% or $190,926 at 6%.
Immunogen Inc. 401(K) Plan and Trust-106$66,996,309$2,428,573$22,911iApproximate average salary by contribution assumption: employee only about $572,777 at 4% or $381,851 at 6%; with 50% employer match about $381,851 at 4% or $254,567 at 6%; with 100% employer match about $286,388 at 4% or $190,926 at 6%.
2020280$60,967,201$1,955,105$24,439iApproximate average salary by contribution assumption: employee only about $610,970 at 4% or $407,314 at 6%; with 50% employer match about $407,314 at 4% or $271,542 at 6%; with 100% employer match about $305,485 at 4% or $203,657 at 6%.
Immunogen Inc. 401(K) Plan and Trust-79$60,967,201$1,955,105$24,748iApproximate average salary by contribution assumption: employee only about $618,704 at 4% or $412,469 at 6%; with 50% employer match about $412,469 at 4% or $274,980 at 6%; with 100% employer match about $309,352 at 4% or $206,235 at 6%.
Immunogen Inc. Welfare Benefit Plan-80---
2019376$56,537,605$4,393,490$57,809iApproximate average salary by contribution assumption: employee only about $1,445,227 at 4% or $963,485 at 6%; with 50% employer match about $963,485 at 4% or $642,323 at 6%; with 100% employer match about $722,613 at 4% or $481,742 at 6%.
Immunogen Inc. 401(K) Plan and Trust-74$56,537,605$4,393,490$59,371iApproximate average salary by contribution assumption: employee only about $1,484,287 at 4% or $989,525 at 6%; with 50% employer match about $989,525 at 4% or $659,683 at 6%; with 100% employer match about $742,144 at 4% or $494,762 at 6%.
Immunogen Inc. Welfare Benefit Plan-75---
Immunogen Inc. Severance Pay Plan for All Employees-76---
20183295$50,297,971$5,409,691$18,338iApproximate average salary by contribution assumption: employee only about $458,448 at 4% or $305,632 at 6%; with 50% employer match about $305,632 at 4% or $203,755 at 6%; with 100% employer match about $229,224 at 4% or $152,816 at 6%.
Immunogen Inc. 401(K) Plan and Trust-295$50,297,971$5,409,691$18,338iApproximate average salary by contribution assumption: employee only about $458,448 at 4% or $305,632 at 6%; with 50% employer match about $305,632 at 4% or $203,755 at 6%; with 100% employer match about $229,224 at 4% or $152,816 at 6%.
Immunogen Inc. Welfare Benefit Plan-295---
Immunogen Inc. Severance Pay Plan for All Employees-295---
20173293$51,804,204$5,315,572$18,142iApproximate average salary by contribution assumption: employee only about $453,547 at 4% or $302,365 at 6%; with 50% employer match about $302,365 at 4% or $201,576 at 6%; with 100% employer match about $226,774 at 4% or $151,182 at 6%.
Immunogen Inc. 401(K) Plan and Trust-293$51,804,204$5,315,572$18,142iApproximate average salary by contribution assumption: employee only about $453,547 at 4% or $302,365 at 6%; with 50% employer match about $302,365 at 4% or $201,576 at 6%; with 100% employer match about $226,774 at 4% or $151,182 at 6%.
Immunogen Inc. Welfare Benefit Plan-292---
Immunogen Inc. Severance Pay Plan for All Employees-292---
20163312$44,106,458$5,689,530$18,236iApproximate average salary by contribution assumption: employee only about $455,892 at 4% or $303,928 at 6%; with 50% employer match about $303,928 at 4% or $202,619 at 6%; with 100% employer match about $227,946 at 4% or $151,964 at 6%.
Immunogen Inc. 401(K) Plan and Trust-312$44,106,458$5,689,530$18,236iApproximate average salary by contribution assumption: employee only about $455,892 at 4% or $303,928 at 6%; with 50% employer match about $303,928 at 4% or $202,619 at 6%; with 100% employer match about $227,946 at 4% or $151,964 at 6%.
Immunogen Inc. Welfare Benefit Plan-304---
Immunogen Inc. Severance Pay Plan for All Employees-295---
20152345$39,427,576$4,729,210$13,708iApproximate average salary by contribution assumption: employee only about $342,696 at 4% or $228,464 at 6%; with 50% employer match about $228,464 at 4% or $152,310 at 6%; with 100% employer match about $171,348 at 4% or $114,232 at 6%.
Immunogen Inc. 401(K) Plan and Trust-345$39,427,576$4,729,210$13,708iApproximate average salary by contribution assumption: employee only about $342,696 at 4% or $228,464 at 6%; with 50% employer match about $228,464 at 4% or $152,310 at 6%; with 100% employer match about $171,348 at 4% or $114,232 at 6%.
Immunogen Inc. Welfare Benefit Plan-345---
20141303$0$0-
Immunogen Inc. Welfare Benefit Plan-303---
20131294$0$0-
Immunogen Inc. Welfare Benefit Plan-294---
20121263$0$0-
Immunogen Inc. Welfare Benefit Plan-263---
20111246$0$0-
Immunogen Inc. Welfare Benefit Plan-246---
20101241$0$0-
Immunogen Inc. Welfare Benefit Plan-241---
20091194$0$0-
Immunogen Inc. Welfare Benefit Plan-194---
20081200$0$0-
Immunogen Inc. Severance Pay Plan for All Employees-200---
20071214$0$0-
Immunogen Inc. Welfare Benefit Plan-214---
20061201$0$0-
Immunogen Inc. Welfare Benefit Plan-201---
20051184$0$0-
Immunogen Inc. Welfare Benefit Plan-184---
20041166$0$0-
Immunogen Inc. Welfare Benefit Plan-166---
200310$0$0-
Immunogen Inc. Welfare Benefit Plan-0---
2001169$0$0-
Immunogen Inc. 401(K) Plan and Trust-69---
2000161$3,113,894$359,496$5,893iApproximate average salary by contribution assumption: employee only about $147,334 at 4% or $98,223 at 6%; with 50% employer match about $98,223 at 4% or $65,482 at 6%; with 100% employer match about $73,667 at 4% or $49,111 at 6%.
Immunogen Inc. 401(K) Plan and Trust-61$3,113,894$359,496$5,893iApproximate average salary by contribution assumption: employee only about $147,334 at 4% or $98,223 at 6%; with 50% employer match about $98,223 at 4% or $65,482 at 6%; with 100% employer match about $73,667 at 4% or $49,111 at 6%.
1999164$3,315,514$330,374$5,162iApproximate average salary by contribution assumption: employee only about $129,052 at 4% or $86,035 at 6%; with 50% employer match about $86,035 at 4% or $57,357 at 6%; with 100% employer match about $64,526 at 4% or $43,017 at 6%.
Immunogen Inc. 401(K) Plan and Trust-64$3,315,514$330,374$5,162iApproximate average salary by contribution assumption: employee only about $129,052 at 4% or $86,035 at 6%; with 50% employer match about $86,035 at 4% or $57,357 at 6%; with 100% employer match about $64,526 at 4% or $43,017 at 6%.