X0306 4 2013-02-19 0 0001235010 MOMENTA PHARMACEUTICALS INC MNTA 0001308911 Bishop John E 675 WEST KENDALL STREET CAMBRIDGE MA 02142 0 1 0 0 Senior VP, Pharmaceutical Scie Common Stock 2013-02-19 4 A 0 11000 0 A 102166 D Common Stock 2013-02-20 4 S 0 239 12.62 D 101927 D Stock Option (Right to Buy) 12.58 2013-02-19 4 A 0 28000 0 A 2013-05-19 2023-02-19 Common Stock 28000 174530 D Represents 11,000 shares of restricted common stock, $0.0001 par value per share, awarded pursuant to the Company's 2004 Stock Incentive Plan, as amended, and subject to a restricted stock agreement to be entered between the Company and Mr. Bishop. Pursuant to the restricted stock agreement, 25% of the shares of restricted Common Stock shall vest on February 19, 2014 and an additional 6.25% of the shares of restricted Common Stock shall vest at the end of each three-month period thereafter. Represents an option granted by the issuer pursuant to the issuer's 2004 Stock Incentive Plan. Subject to certain criteria, the shars subject to such option vest as to 6.25% of the shares at the end of each three-month period following the grant date. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 9, 2009. /s/ Eric Shaff as attorney in fact 2013-02-21