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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
1294284	Ganesh Venkataraman	C/O Momenta Pharmaceuticals, Inc. 675 West Kendall Street Cambridge MA 02142	Senior V.p., Research	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	Disposition	2010-08-03	15,116	$22.07	366,874	No	4	S	Direct
Common Stock	Disposition	2010-08-05	2,584	$17.67	364,290	No	4	S	Direct

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

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 17, 2006.
This transaction was executed in multiple trades at prices ranging from $21.90 to $22.30. 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.
This transaction was executed in multiple trades at prices ranging from $17.60 to $17.73. 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.