X0306
4
2016-01-08
0
0000855654
IMMUNOGEN INC
IMGN
0001629767
Gregory Richard J.
C/O IMMUNOGEN, INC.
830 WINTER STREET
WALTHAM
MA
02451
0
1
0
0
Executive VP & CSO
Common Stock
2016-01-08
4
S
0
2369
11.104
D
22631
D
Weighted average price of shares sold.
The transaction reported in this Form 4 was made in connection with the satisfaction of the reporting person's tax withholding obligation arising from the vesting of restricted shares and was effected pursuant to a 10b5-1 trading plan executed by the reporting person on December 11, 2015.
/s/ Craig Barrows, attorney in fact
2016-01-11