IMMUNOGEN INC

CUSIP: 45253H101 Class: Common Stock

PRIMECAP MANAGEMENT CO/CA/'s Holding History (CIK: 0000763212)

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

Q4 2023
Shares 273,100 Value ($000) $8,097 Avg Close — Range —
Q3 2023
Shares 273,100 Value ($000) $4,334 Avg Close — Range —
Q2 2023
Shares 273,100 Value ($000) $5,153 Avg Close — Range —
Q1 2023
Shares 283,100 Value ($000) $1,087 Avg Close — Range —
Q4 2022
Shares 700,227 Value ($000) $3,473 Avg Close — Range —
Q3 2022
Shares 728,327 Value ($000) $3,481 Avg Close — Range —
Q2 2022
Shares 728,327 Value ($000) $3,277 Avg Close — Range —
Q1 2022
Shares 756,827 Value ($000) $3,602 Avg Close — Range —
Q4 2021
Shares 761,727 Value ($000) $5,652 Avg Close — Range —
Q3 2021
Shares 788,927 Value ($000) $4,473 Avg Close — Range —
Q2 2021
Shares 803,827 Value ($000) $5,297 Avg Close — Range —
Q1 2021
Shares 846,127 Value ($000) $6,854 Avg Close — Range —
Q4 2020
Shares 900,827 Value ($000) $5,810 Avg Close — Range —
Q3 2020
Shares 900,827 Value ($000) $3,243 Avg Close — Range —
Q2 2020
Shares 943,127 Value ($000) $4,338 Avg Close — Range —
Q1 2020
Shares 998,127 Value ($000) $3,404 Avg Close — Range —
Q4 2019
Shares 3,674,927 Value ($000) $18,761 Avg Close — Range —
Q3 2019
Shares 3,693,800 Value ($000) $8,939 Avg Close — Range —
Q2 2019
Shares 3,757,600 Value ($000) $8,154 Avg Close — Range —
Q1 2019
Shares 3,757,600 Value ($000) $10,183 Avg Close — Range —
Q4 2018
Shares 3,765,000 Value ($000) $18,072 Avg Close — Range —
Q3 2018
Shares 3,788,800 Value ($000) $35,880 Avg Close — Range —
Q2 2018
Shares 3,823,300 Value ($000) $37,201 Avg Close — Range —
Q1 2018
Shares 3,823,300 Value ($000) $40,221 Avg Close — Range —
Q4 2017
Shares 3,823,300 Value ($000) $24,507 Avg Close — Range —
Q3 2017
Shares 3,823,300 Value ($000) $29,248 Avg Close — Range —
Q2 2017
Shares 3,882,500 Value ($000) $27,605 Avg Close — Range —
Q1 2017
Shares 3,966,000 Value ($000) $15,348 Avg Close — Range —
Q4 2016
Shares 5,052,943 Value ($000) $10,308 Avg Close — Range —
Q3 2016
Shares 9,619,122 Value ($000) $25,779 Avg Close — Range —
Q2 2016
Shares 10,113,629 Value ($000) $31,150 Avg Close — Range —
Q1 2016
Shares 12,867,483 Value ($000) $109,631 Avg Close — Range —
Q4 2015
Shares 12,867,483 Value ($000) $174,612 Avg Close — Range —
Q3 2015
Shares 12,867,483 Value ($000) $123,528 Avg Close — Range —
Q2 2015
Shares 12,867,483 Value ($000) $185,034 Avg Close — Range —
Q1 2015
Shares 12,609,150 Value ($000) $112,852 Avg Close — Range —
Q4 2014
Shares 12,127,073 Value ($000) $73,975 Avg Close — Range —
Q3 2014
Shares 11,918,396 Value ($000) $126,216 Avg Close — Range —
Q2 2014
Shares 11,922,396 Value ($000) $141,280 Avg Close — Range —
Q1 2014
Shares 12,675,427 Value ($000) $189,244 Avg Close — Range —
Q4 2013
Shares 12,675,427 Value ($000) $185,949 Avg Close — Range —
Q3 2013
Shares 12,601,727 Value ($000) $214,481 Avg Close — Range —
Q2 2013
Shares 12,507,427 Value ($000) $207,498 Avg Close — Range —