IMMUNOGEN INC Change of Control Agreements

Change in Control Severance Agreement dated as of September18, 2023 between the Registrant and Lauren White (Filed With SEC on November 2, 2023)

Change in Control Severance Agreement dated as of December 29, 2022 between the Registrant and Michael J. Vasconcelles (Filed With SEC on March 1, 2023)

Change in Control Severance Agreement dated as of January 5, 2021 between the Registrant and Renee Lentini (Filed With SEC on March 1, 2023)

Change in Control Severance Agreement dated November 15, 2021 between the Registrant and Kristen Harrington-Smith (Filed With SEC on February 28, 2022)

Change in Control Severance Agreement dated as of June 1, 2020 between the Registrant and Stacy Coen (Filed With SEC on March 1, 2021)

Change in Control Severance Agreement dated as of July 20, 2020 between the Registrant and Susan Altschuller, Ph.D (Filed With SEC on August 5, 2020)

Change in Control Severance Agreement dated April 23, 2018 between the Registrant and Blaine H. McKee (Filed With SEC on May 9, 2018)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on May 5, 2017)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on August 25, 2016)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on February 5, 2015)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on October 30, 2014)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on May 2, 2014)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on February 5, 2014)

CHANGE IN CONTROL SEVERANCE AGREEMENT (Filed With SEC on January 30, 2013)

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IMMUNOGEN INC Change of Control Agreements