X0609 4 2026-10-19 0 0001104506 INSMED Inc INSM 0002158408 Hudson Paul false 700 US HIGHWAY 202/206 BRIDGEWATER NJ 08807 1 0 0 0 0 Common Stock 2026-10-19 4 A 0 6139 A 6139 D Represents Restricted Stock Units (RSUs), each representing a contingent right to receive one share of Common Stock, granted pursuant to the Company's Amended and Restated 2019 Incentive Plan, as amended. The RSUs vest in equal parts on each of the first three one-year anniversaries of the date of the grant, provided that the Reporting Person remains a director on each such vesting date. Each RSU was granted on October 19, 2026, for no consideration. /s/ Paul Hudson, by Michael A. Smith as Attorney-in-fact 2026-10-20