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).
| 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.
| 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 |