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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1235010	Momenta Pharmaceuticals Inc	MNTA	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1229450	A Craig Wheeler	C/O Momenta Pharmaceuticals, Inc. 675 West Kendall Street Cambridge MA 02142	President	Yes	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	2017-08-31	2,300	$7.41	262,754	No	4	M	Direct
Common Stock	Disposition	2017-08-31	2,300	$17.00	260,454	No	4	S	Direct
Common Stock	Disposition	2017-08-31	3,450	$17.00	293,088	No	4	S	Indirect	Craig Wheeler Revocable Trust
Common Stock	Acquisiton	2017-09-01	14,167	$7.41	274,621	No	4	M	Direct
Common Stock	Disposition	2017-09-01	14,167	$17.00	260,454	No	4	S	Direct
Common Stock	Disposition	2017-09-01	450	$17.00	292,638	No	4	S	Indirect	Craig Wheeler Revocable Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct
No	4	S	Indirect	Craig Wheeler Revocable Trust
No	4	M	Direct
No	4	S	Direct
No	4	S	Indirect	Craig Wheeler Revocable Trust

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2017-08-31	2,300	$0.00	2,300	$7.41
Common Stock	Stock Option (Right to Buy)	Disposition	2017-09-01	14,167	$0.00	14,167	$7.41

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
65,500	2008-05-22	2018-02-22	No	4	M	Direct
51,333	2008-05-22	2018-02-22	No	4	M	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 1, 2016.
Reflects a decrease of 6,719 shares of MNTA common stock transferred to the Craig Wheeler Revocable Trust on August 29, 2017.
Reflects the transfer of 6,719 shares of MNTA common stock on August 29, 2017 to the Craig Wheeler Revocable Trust that were previously held directly by Mr. Wheeler.
This transaction was executed in multiple trades at prices ranging from $17.00 to $17.025. 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 and prices at which the transaction was effected.