Alnylam Pharmaceuticals's three largest insider shareholders as of April 17, 2026 are Yvonne Greenstreet (Chief Executive Officer, 95.69K 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 |
|---|---|---|---|---|
| Yvonne Greenstreet | Chief Executive Officer | 95,695 | 0 | 06 Mar, 2026 |
| Yvonne Greenstreet | Chief Executive Officer | 95,695 | 0 | 06 Mar, 2026 |
| Jeffrey V. Poulton | Evp, Chief Financial Officer | 61,805 | 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 |
| Tolga Tanguler | Evp, Chief Commercial Officer | 34,297 | 0 | 06 Mar, 2026 |
| Akshay Vaishnaw | President | 22,774 | 0 | 07 Aug, 2023 |
| 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 |
| Bryan Supran | Evp, Clo And Secretary | 14,565 | 0 | 04 Mar, 2026 |
| Melissa Mclaughlin | Chief Human Resources Officer | 9,443 | 0 | 07 Apr, 2026 |
| Robert W. Hesslein | Evp, Clo And Secretary | 8,002 | 0 | 05 Mar, 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 |
| Laurie Keating | Evp, Chief Legal Officer | 5,132 | 0 | 09 Aug, 2021 |
| Indrani Lall Franchini | Evp, Clo Secretary | 4,133 | 0 | 29 Feb, 2024 |
| Indrani Lall Franchini | Evp, Clo Secretary | 4,133 | 0 | 29 Feb, 2024 |
| Dennis A Ausiello | - | 911 | 0 | 15 Aug, 2025 |
| 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 |
| David E I Pyott | - | 911 | 0 | 12 May, 2025 |
| Colleen F Reitan | - | 775 | 0 | 11 Sep, 2025 |
| Colleen F Reitan | - | 775 | 0 | 11 Sep, 2025 |
| Peter N Kellogg | - | 775 | 0 | 12 May, 2025 |
| Peter N Kellogg | - | 775 | 0 | 12 May, 2025 |
| Carolyn R Bertozzi | - | 775 | 0 | 12 May, 2025 |
| Charles Elliott Sigal | - | 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 |
|---|---|---|---|---|---|---|---|---|
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 265 | $316.61 | 13,088 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 359 | $317.44 | 12,729 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 209 | $318.47 | 12,520 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 86 | $319.69 | 12,434 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 147 | $320.62 | 12,287 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 224 | $321.64 | 12,063 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 245 | $322.86 | 11,818 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 81 | $323.64 | 11,737 | D | S |
| 02 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 8 | $325.49 | 11,729 | D | S |
| 06 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 56 | $320.14 | 11,673 | D | S |
| 06 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 909 | $329.76 | 10,764 | D | S |
| 06 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 829 | $330.46 | 9,935 | D | S |
| 06 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 293 | $331.89 | 9,642 | D | S |
| 06 Apr, 2026 | Melissa Mclaughlin | Common Stock | D | 199 | $333.94 | 9,443 | D | S |
| 04 Mar, 2026 | Kevin Joseph Fitzgerald | Common Stock | D | 29 | $319.03 | 21,831 | D | S |
| 04 Mar, 2026 | Tolga Tanguler | Common Stock | D | 106 | $319.03 | 36,500 | D | S |
| 04 Mar, 2026 | Jeffrey V. Poulton | Common Stock | D | 114 | $319.03 | 64,159 | D | S |
| 04 Mar, 2026 | Yvonne Greenstreet | Common Stock | D | 135 | $319.03 | 98,493 | D | S |
| 04 Mar, 2026 | Kevin Joseph Fitzgerald | Common Stock | D | 28 | $320.01 | 21,803 | D | S |
| 04 Mar, 2026 | Yvonne Greenstreet | Common Stock | D | 129 | $320.01 | 98,364 | D | S |