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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
GROGAN DONNA ROY

(Last) (First) (Middle)
C/O MOMENTA PHARMACEUTICALS, INC.
301 BINNEY STREET

(Street)
CAMBRIDGE MA 02142

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
09/18/2019
3. Issuer Name and Ticker or Trading Symbol
MOMENTA PHARMACEUTICALS INC [ MNTA ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
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)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
Remarks:
No securities are beneficially owned.
No securities are beneficially owned.
/s/ Mark Chamberlin as attorney in fact 09/20/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
Exhibit 24.1
LIMITED POWER OF ATTORNEY
FOR SECTION 16 REPORTING OBLIGATIONS
The undersigned hereby makes, constitutes and appoints each 
of Michelle Robertson, Alejandra Carvajal, and R. Mark 
Chamberlin, signing singly and each acting individually, as 
the undersigned's true and lawful attorney-in-fact with 
full power and authority as hereinafter described to:
(1) execute for and on behalf of the undersigned, in the 
undersigned's capacity as a director and/or an officer of 
Momenta Pharmaceuticals, Inc. (the "Company"), Forms 3, 4, 
and 5 (including any amendments thereto) in accordance with 
Section 16(a) of the Securities Exchange Act of 1934, as 
amended, and the rules thereunder (the "Exchange Act");
(2) do and perform any and all acts for and on behalf of 
the undersigned that may be necessary or desirable to 
prepare, complete and execute any such Form 3, 4, or 5, 
prepare, complete and execute any amendment or amendments 
thereto, and timely deliver and file such form with the 
United States Securities and Exchange Commission and any 
stock exchange or similar authority;
(3) seek or obtain, as the undersigned's representative and 
on the undersigned's behalf, information regarding 
transactions in the Company's securities from any
 third 
party, including brokers, employee benefit plan 
administrators and trustees, and the undersigned hereby 
authorizes any such person to release any such information 
to such attorney-in-fact and approves and ratifies any such 
release of information; and
(4) take any other action of any type whatsoever in 
connection with the foregoing that, in the opinion of such 
attorney-in-fact, may be of benefit to, in the best 
interest of, or legally required by, the undersigned, it 
being understood that the documents executed by such 
attorney-in-fact on behalf of the undersigned pursuant to 
this Power of Attorney shall be in such form and shall 
contain such terms and conditions as such attorney-in-fact 
may approve in such attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact 
full power and authority to do and perform any and every 
act and thing whatsoever requisite, necessary, or proper to 
be done in the exercise of any of the rights and powers 
herein granted, as fully to all intents and purposes as the 
undersigned might or could do if personally present, with 
full power of substitution or revocation, hereby ratifying 
and confirming all that such attorney-in-fact, or such 
attorney-in-fact's substitute or substitutes, shall 
lawfully do or cause to be done by virtue of this Power of 
Attorney and the rights and powers herein granted. The 
undersigned acknowledges that the foregoing attorneys-in-
fact, in serving in such capacity at the request of the 
undersigned, are not assuming nor relieving, nor is the 
Company assuming nor relieving, any of the undersigned's 
responsibilities to comply with Section 16 of the Exchange 
Act. The undersigned acknowledges that neither the Company 
nor the foregoing attorneys-in-fact assume (i) any 
liability for the undersigned's responsibility to comply 
with the requirement of the Exchange Act, (ii) any 
liability of the undersigned for any failure to comply with 
such requirements, or (iii) any obligation or liability of 
the undersigned for profit disgorgement under Section 16(b) 
of the Exchange Act.
This Power of Attorney shall remain in full force and 
effect until the undersigned is no longer required to file 
Forms 3, 4, and 5 with respect to the undersigned's 
holdings of and transactions in securities issued by the 
Company, unless earlier revoked by the undersigned in a 
signed writing delivered to the foregoing attorneys-in-
fact. This Power of Attorney supersedes any prior power of 
attorney in connection with the undersigned's 
responsibilities to comply with Section 16 of the Exchange 
Act in the undersigned's capacity as a director and/or 
officer of the Company. This Power of Attorney shall expire 
as to any individual attorney-in-fact if such attorney-in-
fact ceases to be an employee of the Company.
IN WITNESS WHEREOF, the undersigned has caused this Power 
of Attorney to be executed as of this 7th day of September 
2019.

/s/ Donna Grogan
Signature

Donna R. Grogan
Print Name