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Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material:
SEC Accession No. 0001104659-23-122421
Filing Date
2023-11-30
Accepted
2023-11-30 16:07:10
Documents
4

Document Format Files

Seq Description Document Type Size
1 DEFA14A tm2331816d4_defa14a.htm DEFA14A 44117
2 EXHIBIT 2.1 tm2331816d4_ex2-1.htm EX-2.1 488740
3 EXHIBIT 99.1 tm2331816d4_ex99-1.htm EX-99.1 28485
4 GRAPHIC tm2331816d4_ex99-1img001.jpg GRAPHIC 4033
  Complete submission text file 0001104659-23-122421.txt   568077
Mailing Address 830 WINTER ST WALTHAM MA 02451
Business Address 830 WINTER ST WALTHAM MA 02451 (781)895-0600
ImmunoGen, Inc. (Filer) CIK: 0000855654 (see all company filings)

IRS No.: 042726691 | State of Incorp.: MA | Fiscal Year End: 1231
Type: DEFA14A | Act: 34 | File No.: 000-17999 | Film No.: 231455764
SIC: 2834 Pharmaceutical Preparations