ImmunoGen Announces Inducement Grant Under Nasdaq Listing Rule 5635(c)(4)

ImmunoGen Inc., (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, today announced that on January 31, 2020 the compensation committee of the Company’s board of directors granted a non-qualified stock option award to purchase an aggregate of 6,600 shares of its common stock to a new employee under the ImmunoGen, Inc. Inducement Equity Incentive Plan, or the Inducement Plan. The stock option was granted as an inducement material to the new employee’s becoming an employee of ImmunoGen in accordance with Nasdaq Listing Rule 5635(c)(4).

The Inducement Plan is used exclusively for the grant of equity awards to individuals who were not previously employees of ImmunoGen (or following a bona fide period of non-employment), as an inducement material to such individual’s entering into employment with ImmunoGen, pursuant to Rule 5635(c)(4) of the Nasdaq Listing Rules.

The option has an exercise price of $4.725 per share, which is equal to the closing price of ImmunoGen’s common stock on The Nasdaq Global Select Market on January 31, 2020. The option will vest over a four-year period, with 25% of the shares vesting on the one-year anniversary of the date of grant, and thereafter an additional 6.25% of the shares vesting on each succeeding quarterly anniversary of the date of grant, subject to such employee’s continued employment with ImmunoGen on such vesting dates. The option is subject to the terms and conditions of the Inducement Plan and the terms and conditions of a stock option agreement covering the grant.

ABOUT IMMUNOGEN

ImmunoGen is developing the next generation of antibody-drug conjugates to improve outcomes for cancer patients. By generating targeted therapies with enhanced anti-tumor activity and favorable tolerability profiles, we aim to disrupt the progression of cancer and offer our patients more good days. We call this our commitment to “target a better now.”

Learn more about who we are, what we do, and how we do it at www.immunogen.com.

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INVESTOR RELATIONS AND MEDIA ImmunoGen Courtney O’Konek 781-895-0600 [e-mail]

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FTI Consulting Robert Stanislaro 212-850-5657 [e-mail]