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).
| 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.
| 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 |