IMMUNOGEN INC

CUSIP: 45253h101 Class: COM

BERKSHIRE ASSET MANAGEMENT LLC/PA's Holding History (CIK: 0000949012)

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

Q1 2022
Shares 10,773 Value ($000) $51 Avg Close — Range —
Q4 2021
Shares 10,934 Value ($000) $81 Avg Close — Range —
Q3 2021
Shares 11,556 Value ($000) $66 Avg Close — Range —
Q2 2021
Shares 11,719 Value ($000) $77 Avg Close — Range —
Q1 2021
Shares 11,556 Value ($000) $94 Avg Close — Range —
Q4 2020
Shares 12,397 Value ($000) $80 Avg Close — Range —
Q1 2020
Shares 11,862 Value ($000) $40 Avg Close — Range —