IMMUNOGEN INC

CUSIP: 45253H101 Class: Common Stock

FORT WASHINGTON INVESTMENT ADVISORS INC /OH/'s Holding History (CIK: 0001009016)

Note: Option positions (PUT/CALL) are excluded.

Q4 2013
Shares 151,895 Value ($000) $2,228 Avg Close — Range —
Q3 2013
Shares 186,925 Value ($000) $3,181 Avg Close — Range —