X0202 4 2006-10-10 0 0000855654 IMMUNOGEN INC IMGN 0001198338 LAMBERT JOHN C/O IMMUNOGEN, INC. 128 SIDNEY STREET CAMBRIDGE MA 02139 0 1 0 0 Senior Vice President Common Stock 2006-10-10 4 M 0 700 .844 A 31991 D Common Stock 2006-10-10 4 S 0 700 4.00 D 31291 D Incentive Stock Option (right to buy) .844 2006-10-10 4 M 0 700 .844 D 1998-12-31 2007-12-31 Common Stock 700 40967 D Exercisable as to 30,556 on December 31, 1998, 30,556 exercisable on December 31, 1999, and 30,555 exercisable on December 31, 2000. The transactions reported in this Form 4 were effected pursuant to a 10b5-1 trading adopted by the reporting person on March 10, 2006. /s/ John Lambert 2006-10-12