FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Lentini Renee
2. Date of Event Requiring Statement (MM/DD/YYYY)
1/1/2021 

3. Issuer Name and Ticker or Trading Symbol

ImmunoGen, Inc. [IMGN]
(Last)        (First)        (Middle)

830 WINTER STREET
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
V.P.-Fin., Prin. Acctg. Off. /
(Street)

WALTHAM, MA 02451      

(City)              (State)              (Zip)
5. If Amendment, Date Original Filed(MM/DD/YYYY)
 

6. Individual or Joint/Group Filing(Check Applicable Line)

_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 12148 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to buy) 7/22/2012 (1)7/22/2021 Common Stock 9000 $15.20 D  
Stock Option (Right to buy) 7/20/2013 (1)7/20/2022 Common Stock 9000 $15.83 D  
Stock Option (Right to buy) 7/16/2014 (1)7/16/2023 Common Stock 9000 $19.02 D  
Stock Option (Right to buy) 7/17/2015 (1)7/17/2024 Common Stock 9000 $10.79 D  
Stock Option (Right to buy) 7/13/2016 (1)7/13/2025 Common Stock 8250 $16.72 D  
Stock Option (Right to buy) 7/18/2017 (1)7/18/2026 Common Stock 11500 $3.05 D  
Stock Option (Right to buy) 9/30/2017 (1)9/30/2026 Common Stock 19000 $2.68 D  
Stock Option (Right to buy) 2/21/2018 (1)2/21/2027 Common Stock 6000 $2.47 D  
Stock Option (Right to buy) 2/15/2019 (2)2/15/2028 Common Stock 23000 $10.65 D  
Stock Option (Right to buy) 1/31/2020 (2)1/31/2029 Common Stock 36400 $5.25 D  
Stock Option (Right to buy) 7/18/2020 (3)7/18/2029 Common Stock 69000 $2.31 D  
Stock Option (Right to buy) 2/7/2021 (3)2/7/2030 Common Stock 52440 $4.55 D  

Explanation of Responses:
(1) All options are exercisable as of the filing date of this Form 3.
(2) Exercisable in three equal installments over three years starting on the first year anniversary of the grant.
(3) 25% of the options are exercisable on the first year anniversary of the grant and the balance is exercisable in twelve equal installments of 6.25%, quarterly over the following three years starting one quarter after the first year anniversary.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Lentini Renee
830 WINTER STREET
WALTHAM, MA 02451


V.P.-Fin., Prin. Acctg. Off.

Signatures
/s/ Renee Lentini1/11/2021
**Signature of Reporting PersonDate

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