X0206 3 2020-01-08 0 0001235010 MOMENTA PHARMACEUTICALS INC MNTA 0001798748 Cieplinska Agnieszka C/O MOMENTA PHARMACEUTICALS, INC. 301 BINNEY ST. CAMBRIDGE MA 02142 0 1 0 0 VP FINANCE, CONTROLLER (PAO) Stock Option (Right to Buy) 13.85 2029-04-12 Common Stock 25000 D The stock option will vest and become exercisable with respect to 6,250 shares on the first anniversary of the grant date, and the remainder will vest in equal quarterly installments thereafter. All vesting is subject to Agnieszka Cieplinska's continued service to the Company through the applicable vesting date. Exhibit List: Exhibit 24 - Power of Attorney /s/ R. Mark Chamberlin as attorney in fact 2020-01-15