FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *

WHEELER CRAIG A
2. Issuer Name and Ticker or Trading Symbol

MOMENTA PHARMACEUTICALS INC [ MNTA ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President & CEO
(Last)          (First)          (Middle)

C/O MOMENTA PHARMACEUTICALS, INC., 301 BINNEY STREET
3. Date of Earliest Transaction (MM/DD/YYYY)

5/12/2020
(Street)

CAMBRIDGE, MA 02142
(City)        (State)        (Zip)
4. 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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 5/12/2020  M(1)  6172 A (2)18091 D  
Common Stock 5/13/2020  S(3)  2778 D$31.23 (4)15313 D  
Common Stock         36725 I Craig A Wheeler 2016 Annuity Trust 
Common Stock         48263 I Craig A Wheeler 2018 Annuity Trust 
Common Stock         474598 I Craig Wheeler Revocable Trust 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units  (2)5/12/2020  M (1)    6172   (5) (5)Common Stock 6172 $0 43203 D  

Explanation of Responses:
(1) Shares received pursuant to settlement of Restricted Stock Units that were granted on February 12, 2018.
(2) Restricted Stock Units convert into common stock on a one-for-one basis.
(3) This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 16, 2018.
(4) This transaction was executed in multiple trades at prices ranging from $30.52 to $31.89. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(5) Subject to the officer's continued employment with the company, the restricted stock units will vest with respect to 25% of the shares on the first anniversary of the grant date, and the remainder will vest in equal quarterly installments over the subsequent three years.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
WHEELER CRAIG A
C/O MOMENTA PHARMACEUTICALS, INC.
301 BINNEY STREET
CAMBRIDGE, MA 02142
X
President & CEO

Signatures
/s/ R. Mark Chamberlin as attorney in fact5/14/2020
**Signature of Reporting PersonDate

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