IMMUNOGEN INC

CUSIP: 45253H101 Class: Common Stock

TOCQUEVILLE ASSET MANAGEMENT L.P.'s Holding History (CIK: 0000883961)

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

Q2 2014
Shares 21,400 Value ($000) $254 Avg Close — Range —
Q1 2014
Shares 21,400 Value ($000) $320 Avg Close — Range —
Q4 2013
Shares 29,400 Value ($000) $431 Avg Close — Range —
Q3 2013
Shares 29,400 Value ($000) $500 Avg Close — Range —