Form SC 13G/A - Statement of Beneficial Ownership by Certain Investors: [Amend]
SEC Accession No. 0000902219-13-000246
Filing Date
2013-02-14
Accepted
2013-02-14 12:30:56
Documents
1

Document Format Files

Seq Description Document Type Size
1 DISCLOSURE DOCUMENT sec_filing.htm SC 13G/A 17889
  Complete submission text file 0000902219-13-000246.txt   19456
Mailing Address 830 WINTER ST WALTHAM MA 02451
Business Address 830 WINTER ST WALTHAM MA 02451 (781)895-0600
IMMUNOGEN INC (Subject) CIK: 0000855654 (see all company filings)

EIN.: 042726691 | State of Incorp.: MA | Fiscal Year End: 0630
Type: SC 13G/A | Act: 34 | File No.: 005-40774 | Film No.: 13609348
SIC: 2834 Pharmaceutical Preparations

Mailing Address 280 CONGRESS STREET BOSTON MA 02210
Business Address 280 CONGRESS STREET BOSTON MA 02210 6179515000
WELLINGTON MANAGEMENT CO LLP (Filed by) CIK: 0000902219 (see all company filings)

EIN.: 042683227 | State of Incorp.: MA | Fiscal Year End: 1231
Type: SC 13G/A
SIC: 0000