401k Plan data: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES plan

IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 401k Plan overview

Plan Name	IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES
Plan identification number	503

IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES Benefits

401k Plan Type	Welfare Benefit
Plan Features/Benefits	Severance pay Unfunded, fully insured, or combination unfunded/insured welfare plan that will not file a Form 5500 for next plan year pursuant to 29 CFR 2520.104-20. Unfunded, fully insured, or combination unfunded/insured welfare plan that stopped filing form 5500s in an earlier plan year pursuant to 29 CFR 2520.104-20.

401k Sponsoring company profile

IMMUNOGEN, INC. has sponsored the creation of one or more 401k plans.

Company Name: IMMUNOGEN, INC.

Employer identification number (EIN): 042726691

NAIC Classification: 541700

Form 5500 Filing Information

Submission information for form 5500 for 401k plan IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
503 2022-01-01 SHELLY ADLER 2023-08-28
503 2019-01-01 BRENDA SOM 2020-05-12
503 2018-01-01
503 2017-01-01
503 2016-09-23 AUDREY BERGAN

Plan id#	Filing Submission Date	Name of Administrator	Date Administrator Signed
503	2022-01-01	SHELLY ADLER	2023-08-28
503	2019-01-01	BRENDA SOM	2020-05-12
503	2018-01-01
503	2017-01-01
503	2016-09-23	AUDREY BERGAN

Plan Statistics for IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES

401k plan membership statisitcs for IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES

Measure Date Value
2022: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2022 401k membership
Total participants, beginning-of-year 2022-01-01 106
Total number of active participants reported on line 7a of the Form 5500 2022-01-01 277
Number of retired or separated participants receiving benefits 2022-01-01 0
Number of other retired or separated participants entitled to future benefits 2022-01-01 0
Total of all active and inactive participants 2022-01-01 277
Number of employers contributing to the scheme 2022-01-01 0
2019: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2019 401k membership
Total participants, beginning-of-year 2019-01-01 295
Total number of active participants reported on line 7a of the Form 5500 2019-01-01 76
Number of retired or separated participants receiving benefits 2019-01-01 0
Number of other retired or separated participants entitled to future benefits 2019-01-01 0
Total of all active and inactive participants 2019-01-01 76
Number of employers contributing to the scheme 2019-01-01 0
2018: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2018 401k membership
Total participants, beginning-of-year 2018-01-01 292
Total number of active participants reported on line 7a of the Form 5500 2018-01-01 295
Number of retired or separated participants receiving benefits 2018-01-01 0
Number of other retired or separated participants entitled to future benefits 2018-01-01 0
Total of all active and inactive participants 2018-01-01 295
Number of employers contributing to the scheme 2018-01-01 0
2017: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2017 401k membership
Total participants, beginning-of-year 2017-01-01 305
Total number of active participants reported on line 7a of the Form 5500 2017-01-01 292
Number of retired or separated participants receiving benefits 2017-01-01 0
Number of other retired or separated participants entitled to future benefits 2017-01-01 0
Total of all active and inactive participants 2017-01-01 292
2016: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2016 401k membership
Total participants, beginning-of-year 2016-09-23 364
Total number of active participants reported on line 7a of the Form 5500 2016-09-23 295
Number of retired or separated participants receiving benefits 2016-09-23 0
Number of other retired or separated participants entitled to future benefits 2016-09-23 0
Total of all active and inactive participants 2016-09-23 295

Measure	Date	Value
2022: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2022 401k membership
Total participants, beginning-of-year	2022-01-01	106
Total number of active participants reported on line 7a of the Form 5500	2022-01-01	277
Number of retired or separated participants receiving benefits	2022-01-01	0
Number of other retired or separated participants entitled to future benefits	2022-01-01	0
Total of all active and inactive participants	2022-01-01	277
Number of employers contributing to the scheme	2022-01-01	0
2019: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2019 401k membership
Total participants, beginning-of-year	2019-01-01	295
Total number of active participants reported on line 7a of the Form 5500	2019-01-01	76
Number of retired or separated participants receiving benefits	2019-01-01	0
Number of other retired or separated participants entitled to future benefits	2019-01-01	0
Total of all active and inactive participants	2019-01-01	76
Number of employers contributing to the scheme	2019-01-01	0
2018: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2018 401k membership
Total participants, beginning-of-year	2018-01-01	292
Total number of active participants reported on line 7a of the Form 5500	2018-01-01	295
Number of retired or separated participants receiving benefits	2018-01-01	0
Number of other retired or separated participants entitled to future benefits	2018-01-01	0
Total of all active and inactive participants	2018-01-01	295
Number of employers contributing to the scheme	2018-01-01	0
2017: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2017 401k membership
Total participants, beginning-of-year	2017-01-01	305
Total number of active participants reported on line 7a of the Form 5500	2017-01-01	292
Number of retired or separated participants receiving benefits	2017-01-01	0
Number of other retired or separated participants entitled to future benefits	2017-01-01	0
Total of all active and inactive participants	2017-01-01	292
2016: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2016 401k membership
Total participants, beginning-of-year	2016-09-23	364
Total number of active participants reported on line 7a of the Form 5500	2016-09-23	295
Number of retired or separated participants receiving benefits	2016-09-23	0
Number of other retired or separated participants entitled to future benefits	2016-09-23	0
Total of all active and inactive participants	2016-09-23	295

Form 5500 Responses for IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES

2022: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2022 form 5500 responses
2022-01-01	Type of plan entity	Single employer plan
2022-01-01	Plan funding arrangement – General assets of the sponsor	Yes
2022-01-01	Plan benefit arrangement – General assets of the sponsor	Yes
2019: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2019 form 5500 responses
2019-01-01	Type of plan entity	Single employer plan
2019-01-01	Plan funding arrangement – General assets of the sponsor	Yes
2019-01-01	Plan benefit arrangement – General assets of the sponsor	Yes
2018: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2018 form 5500 responses
2018-01-01	Type of plan entity	Single employer plan
2018-01-01	Plan funding arrangement – General assets of the sponsor	Yes
2018-01-01	Plan benefit arrangement – General assets of the sponsor	Yes
2017: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2017 form 5500 responses
2017-01-01	Type of plan entity	Single employer plan
2017-01-01	Plan funding arrangement – General assets of the sponsor	Yes
2017-01-01	Plan benefit arrangement – General assets of the sponsor	Yes
2016: IMMUNOGEN, INC. SEVERANCE PAY PLAN FOR ALL EMPLOYEES 2016 form 5500 responses
2016-09-23	Type of plan entity	Single employer plan
2016-09-23	First time form 5500 has been submitted	Yes
2016-09-23	Submission has been amended	No
2016-09-23	This submission is the final filing	No
2016-09-23	This return/report is a short plan year return/report (less than 12 months)	Yes
2016-09-23	Plan is a collectively bargained plan	No
2016-09-23	Plan funding arrangement – General assets of the sponsor	Yes
2016-09-23	Plan benefit arrangement – General assets of the sponsor	Yes

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IMMUNOGEN, INC. 401(K) PLAN AND TRUST [EIN = 043096669]

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Company Name:	IMMUNOGEN, INC.
Employer identification number (EIN):	042726691
NAIC Classification:	541700