Form 4/A - Statement of changes in beneficial ownership of securities: [Amend]
SEC Accession No. 0001415889-23-016755
Filing Date
2023-12-19
Accepted
2023-12-19 19:00:22
Documents
1
Period of Report
2023-09-22

Document Format Files

Seq Description Document Type Size
1 form4a-12202023_121207.html 4/A  
1 form4a-12202023_121207.xml 4/A 3414
  Complete submission text file 0001415889-23-016755.txt   4893
Mailing Address 830 WINTER ST WALTHAM MA 02451
Business Address 830 WINTER ST WALTHAM MA 02451 (781)895-0600
ImmunoGen, Inc. (Issuer) CIK: 0000855654 (see all company filings)

EIN.: 042726691 | State of Incorp.: MA | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)

Mailing Address C/O BRISTOL MYERS SQUIBB CO 345 PARK AVE NEW YORK NY 10164
Business Address
MITCHELL DEAN J (Reporting) CIK: 0001199297 (see all company filings)

Type: 4/A | Act: 34 | File No.: 000-17999 | Film No.: 231498924