X0206 3 2019-06-03 0 0001104506 INSMED Inc INSM 0001779466 GOLL JOHN 10 FINDERNE AVENUE BUILDING 10 BRIDGEWATER NJ 08807 0 1 0 0 Chief Act. Off. & Controller Common Stock 7322 D Includes 6,003 unvested Restricted Stock Units granted pursuant to the Company's 2017 Incentive Plan that each represent a contingent right to receive one share of Common Stock. The Restricted Stock Units vest and become available as follows: twenty five (25%) percent on each anniversary of the date of grant through the fourth anniversary date of the grant. The Restricted Stock Units were granted on January 4, 2018 and May 15, 2019. /s/ John Goll, by Christine Pellizzari as Attorney-in-fact 2019-06-12