Menu CONTACT US CORPORATE HEADQUARTERS ImmunoGen, Inc. 830 Winter Street Waltham, MA 02451-1477 Phone: 781-895-0600 Email: info@immunogen.com MEDICAL AFFAIRS Phone: 781-895-0115 Email: medicalaffairs@immunogen.com HUMAN RESOURCES Learn more about job opportunities with ImmunoGen by visiting the Careers section of our website. SHAREHOLDER INQUIRIES Inquiries related to the Company may be directed to the Investor Relations department at our headquarters. Communications related to stock and transfer requirements, including lost stock certificates and change of name or address, should be directed to the Transfer Agent. TRANSFER AGENT AND REGISTRAR Broadridge Corporate Issuer Solutions, Inc. P.O. Box 1342 Brentwood, NY 11717 Phone: 877-830-4936 Fax: 215-553-5402 E-mail: shareholder@broadridge.com CORPORATE COUNSEL Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. Boston, MA CONTACT US PRIVACY POLICY USAGE POLICY © 2021 ImmunoGen, Inc., All Rights Reserved ImmunoGen, the ImmunoGen logos, and TARGET A BETTER NOW are trademarks or registered trademarks of ImmunoGen, Inc.

Menu WHAT WE DO We think it’s time to give the world a therapy that targets the problem and only the problem. A therapy that targets cancer cells where they live, not where you live. Because liberating lives is what we live for. At ImmunoGen, our science targets cancer cells and our hearts target a better now. LISA’S STORY Lisa shares an intimate and inspiring story of what it means to wake up from a routine cyst removal surgery to hear the words, “You have ovarian cancer.” From that diagnosis to today, Lisa shares the ups and downs of treatment, a special bond with the man who would not leave her side, and her commitment as an advocate and fundraiser to make sure the often hidden signs of ovarian cancer do not stay hidden for long. With the help of the National Ovarian Cancer Coalition, Lisa is a passionate advocate for ovarian cancer and she is our inspiration. GAYLE’S STORY Gayle describes herself as always on the “go-go-go.” Fiercely independent and proud of her grandchildren, Gayle shares the shock of her AML diagnosis and the whirlwind of treatments, quarantines, and lengthy hospital stays that kept her away from everyday life for months. With a mantra of “10 more steps a day,” and a supportive husband and family, Gayle shares how an unexpected post on social media helped her put cancer behind her. With the help of the Leukemia and Lymphoma Society, Gayle is a passionate advocate for acute myeloid leukemia and she is our inspiration. PATIENT STORIES We have met many amazing men and women whose lives have been interrupted by the progression of cancer. We look to these people as inspiration. ANDRE’S STORY ANN’S STORY DAN’S STORY ELLE’S STORY JOHN’S STORY RORY’S STORY SANDRA’S STORY OUR PIPELINE LEARN MORE PUBLICATIONS LEARN MORE OUR SCIENCE LEARN MORE OUR TARGET INDICATIONS LEARN MORE CONTACT US PRIVACY POLICY USAGE POLICY © 2021 ImmunoGen, Inc., All Rights Reserved ImmunoGen, the ImmunoGen logos, and TARGET A BETTER NOW are trademarks or registered trademarks of ImmunoGen, Inc.