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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1235010	Momenta Pharmaceuticals Inc	MNTA	Biological Products, (No Disgnostic Substances) (2836)	043561634

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1706857	Santiago Arroyo	C/O Momenta Pharmaceuticals, Inc. 301 Binney Street Cambridge MA 02142	Svp, Chief Medical Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2019-02-12	25,000	$0.00	58,335	No	4	M	Direct
Common Stock	Disposition	2019-02-13	7,742	$12.70	50,593	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2019-02-12	25,000	$0.00	25,000	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
25,000			No	4	M	Direct

Footnotes

Shares received pursuant to settlement of Restricted Stock Units that were granted on February 12, 2018.
This transaction was effected pursuant to a Rule 10b5-1 trading plan.
Restricted Stock Units convert into common stock on a one-for-one basis.
Subject to the officer's continued employment with the company, the restricted stock units will vest with respect to 50% of the shares on the first anniversary of the grant date, and the remaining 50% will vest on the second anniversary of the grant date.