X0306 4 2019-02-11 0 0001235010 MOMENTA PHARMACEUTICALS INC MNTA 0001755098 ROBERTSON MICHELLE C/O MOMENTA PHARMACEUTICALS, INC. 301 BINNEY STREET CAMBRIDGE MA 02142 0 1 0 0 Chief Financial Officer Stock Option (Right to Buy) 12.76 2019-02-11 4 A 0 97000 0 A 2029-02-11 Common Stock 97000 97000 D Represents options granted by the issuer pursuant to the issuer's 2013 Incentive Award Plan, as amended and restated. The stock option will vest and become exercisable with respect to 24,250 shares on the first anniversary of the grant date, and the remainder will vest in equal quarterly installments over the subsequent three years. All vesting is subject to Michelle Robertson's continued service to the Company through the applicable vesting date. /s/ R. Mark Chamberlin as attorney in fact 2019-02-13