IMMUNOGEN INC

CUSIP: 45253H101 Class: Common Stock

DRIEHAUS CAPITAL MANAGEMENT LLC's Holding History (CIK: 0000938206)

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

Q4 2023
Shares 195,980 Value ($000) $5,811 Avg Close — Range —
Q3 2023
Shares 1,440,052 Value ($000) $22,854 Avg Close — Range —
Q2 2023
Shares 1,176,130 Value ($000) $22,194 Avg Close — Range —
Q2 2022
Shares 330,909 Value ($000) $1,489 Avg Close — Range —
Q1 2022
Shares 250,000 Value ($000) $1,190 Avg Close — Range —
Q4 2021
Shares 250,000 Value ($000) $1,855 Avg Close — Range —
Q2 2017
Shares 67,739 Value ($000) $482 Avg Close — Range —
Q2 2015
Shares 173,720 Value ($000) $2,498 Avg Close — Range —