Alnylam Pharmaceuticals, Inc. (ALNY) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, Alnylam Pharmaceuticals's top three insider holders are John Maraganore (Chief Executive Officer, 227.66K shares), Yvonne Greenstreet (Chief Executive Officer, 95.69K shares), Jeffrey V. Poulton (Evp, Chief Financial Officer, 61.80K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
John Maraganore Chief Executive Officer 227,663 0 23 Dec, 2021
Yvonne Greenstreet Chief Executive Officer 95,695 0 06 Mar, 2026
Jeffrey V. Poulton Evp, Chief Financial Officer 61,805 0 06 Mar, 2026
Tolga Tanguler Evp, Chief Commercial Officer 34,297 0 06 Mar, 2026
Akshay Vaishnaw President 22,774 0 07 Aug, 2023
Kevin Joseph Fitzgerald Cso Evp, Head Of Research 20,569 0 06 Mar, 2026
Pushkal Garg Evp Chief Rd 18,693 0 06 Mar, 2026
Michael W Bonney 16,804 0 19 Aug, 2025
Bryan Supran Evp, Clo And Secretary 14,565 0 04 Mar, 2026
Amy W Schulman 11,961 0 12 May, 2025
Robert W. Hesslein Evp, Clo And Secretary 8,002 0 05 Mar, 2025
Laurie Keating Evp, Chief Legal Officer 5,132 0 09 Aug, 2021
Indrani Lall Franchini Evp, Clo Secretary 4,133 0 29 Feb, 2024
Steven M Paul 1,000 0 05 Apr, 2022
David E I Pyott 911 0 12 May, 2025
Margaret A Hamburg 911 0 12 May, 2025
Dennis A Ausiello 911 0 15 Aug, 2025
Carolyn R Bertozzi 775 0 12 May, 2025
Charles Elliott Sigal 775 0 12 May, 2025
Peter N Kellogg 775 0 12 May, 2025
Colleen F Reitan 775 0 11 Sep, 2025
Olivier Brandicourt 775 0 12 May, 2025
Marsha Fanucci 136 0 27 Feb, 2023

* 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
04 Mar, 2026 Tolga Tanguler Common Stock D 106 $319.03 36,500 D S
04 Mar, 2026 Yvonne Greenstreet Common Stock D 135 $319.03 98,493 D S
04 Mar, 2026 Jeffrey V. Poulton Common Stock D 114 $319.03 64,159 D S
04 Mar, 2026 Pushkal Garg Common Stock D 106 $319.03 23,300 D S
04 Mar, 2026 Kevin Joseph Fitzgerald Common Stock D 29 $319.03 21,831 D S
04 Mar, 2026 Yvonne Greenstreet Common Stock D 129 $320.01 98,364 D S
04 Mar, 2026 Jeffrey V. Poulton Common Stock D 109 $320.01 64,050 D S
04 Mar, 2026 Pushkal Garg Common Stock D 102 $320.01 23,198 D S
04 Mar, 2026 Kevin Joseph Fitzgerald Common Stock D 28 $320.01 21,803 D S
04 Mar, 2026 Tolga Tanguler Common Stock D 102 $320.01 36,398 D S
04 Mar, 2026 Pushkal Garg Common Stock D 215 $320.81 22,983 D S
04 Mar, 2026 Kevin Joseph Fitzgerald Common Stock D 59 $320.81 21,744 D S
04 Mar, 2026 Jeffrey V. Poulton Common Stock D 230 $320.81 63,820 D S
04 Mar, 2026 Yvonne Greenstreet Common Stock D 274 $320.81 98,090 D S
04 Mar, 2026 Tolga Tanguler Common Stock D 215 $320.81 36,183 D S
04 Mar, 2026 Yvonne Greenstreet Common Stock D 368 $321.82 97,722 D S
04 Mar, 2026 Tolga Tanguler Common Stock D 289 $321.82 35,894 D S
04 Mar, 2026 Jeffrey V. Poulton Common Stock D 309 $321.82 63,511 D S
04 Mar, 2026 Pushkal Garg Common Stock D 289 $321.82 22,694 D S
04 Mar, 2026 Kevin Joseph Fitzgerald Common Stock D 79 $321.82 21,665 D S