INSMED Inc (INSM) Insider Ownership

Historic Insider Ownership Trends

Over the 90-day window ending January 10, 2026, INSMED's three dominant insider ownership positions are held by Chair And Ceo William Lewis (549.33K shares), Director Steinar J Engelsen (320.80K shares), Director Melvin Md Sharoky (244.69K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
William Lewis Chair And Ceo 549,331 08 Jan, 2026
Steinar J Engelsen 320,802 03 Nov, 2021
Melvin Md Sharoky 244,689 09 Dec, 2025
Christine A Pellizzari Chief Legal Officer 149,985 18 May, 2021
John Drayton Wise Chief Commercial Officer 133,015 07 Feb, 2025
David R Brennan 126,933 10 Nov, 2025
Roger Adsett Chief Operating Officer 107,601 08 Jan, 2026
David W J Mcgirr 97,723 04 Jun, 2025
Martina M.D. Flammer Chief Medical Officer 86,794 08 Jan, 2026
Sara Bonstein Chief Financial Officer 80,506 08 Jan, 2026
Clarissa Desjardins 70,032 19 May, 2025
Alfred Altomari 69,495 15 May, 2024
Carol Schafer 63,317 19 May, 2025
Elizabeth M Anderson 58,729 26 Nov, 2025
Michael Alexander Smith Chief Legal Officer 57,037 08 Jan, 2026
Leo Lee 54,677 18 Nov, 2025
Orlov S Nicole Schaeffer Chief People Strategy Officer 41,754 06 Jan, 2026
John Soriano Chief Compliance Officer 35,204 09 Sep, 2021

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
08 Jan, 2026 William Lewis Common Stock D 3,223 $174.17 315,407 D S
08 Jan, 2026 Sara Bonstein Common Stock D 1,447 $174.17 80,506 D S
08 Jan, 2026 Roger Adsett Common Stock D 2,059 $174.17 107,601 D S
08 Jan, 2026 Martina M.D. Flammer Common Stock D 1,660 $173.87 90,045 D S
08 Jan, 2026 Martina M.D. Flammer Common Stock D 3,251 $174.17 86,794 D S
08 Jan, 2026 Michael Alexander Smith Common Stock D 1,053 $174.17 57,037 D S
07 Jan, 2026 William Lewis Common Stock D 2,357 $175.07 318,630 D S
07 Jan, 2026 Sara Bonstein Common Stock D 1,678 $175.07 81,953 D S
07 Jan, 2026 Roger Adsett Common Stock D 802 $175.07 109,660 D S
07 Jan, 2026 Martina M.D. Flammer Common Stock D 1,434 $175.84 91,705 D S
07 Jan, 2026 Michael Alexander Smith Common Stock D 709 $175.07 58,090 D S
06 Jan, 2026 William Lewis Common Stock D 4,096 $173.33 320,987 D S
06 Jan, 2026 Sara Bonstein Common Stock D 1,517 $173.33 83,631 D S
06 Jan, 2026 Roger Adsett Common Stock D 1,429 $173.33 110,462 D S
06 Jan, 2026 Martina M.D. Flammer Common Stock D 2,830 $174.21 95,711 D S
06 Jan, 2026 Martina M.D. Flammer Common Stock A 8,570 $26.43 103,324 D M
06 Jan, 2026 Martina M.D. Flammer Common Stock D 957 $175.01 94,754 D S
06 Jan, 2026 Martina M.D. Flammer Common Stock D 1,615 $173.33 93,139 D S
06 Jan, 2026 Martina M.D. Flammer Common Stock D 4,783 $173.47 98,541 D S
06 Jan, 2026 Michael Alexander Smith Common Stock D 1,396 $173.33 58,799 D S