Over the 90-day window ending December 12, 2025, Alnylam Pharmaceuticals's three dominant insider ownership positions are held by Chief Executive Officer Yvonne Greenstreet (68.98K shares), EVP And Chief Financial Officer Jeffrey V. Poulton (54.05K shares), EVP And Chief Commercial Officer Tolga Tanguler (27.44K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| John Maraganore | Chief Executive Officer | 227,663 | 23 Dec, 2021 |
| Yvonne Greenstreet | Chief Executive Officer | 68,985 | 01 Dec, 2025 |
| Jeffrey V. Poulton | EVP And Chief Financial Officer | 54,052 | 03 Oct, 2025 |
| Tolga Tanguler | EVP And Chief Commercial Officer | 27,438 | 03 Oct, 2025 |
| Akshay Vaishnaw | President | 22,774 | 07 Aug, 2023 |
| Kevin Joseph Fitzgerald | Cso & EVP And Head Of Research | 21,264 | 19 Nov, 2025 |
| Pushkal Garg | EVP Chief R&D | 20,221 | 03 Oct, 2025 |
| Michael W Bonney | 16,804 | 19 Aug, 2025 | |
| Bryan Supran | EVP And Clo And Secretary | 13,026 | 03 Oct, 2025 |
| Amy W Schulman | 11,961 | 12 May, 2025 | |
| Robert W. Hesslein | EVP And Clo And Secretary | 8,002 | 05 Mar, 2025 |
| Laurie Keating | EVP And Chief Legal Officer | 5,132 | 09 Aug, 2021 |
| Indrani Lall Franchini | EVP And Clo & Secretary | 4,133 | 29 Feb, 2024 |
| Steven M Paul | 1,000 | 05 Apr, 2022 | |
| Dennis A Ausiello | 911 | 15 Aug, 2025 | |
| David E I Pyott | 911 | 12 May, 2025 | |
| Margaret A Hamburg | 911 | 12 May, 2025 | |
| Charles Elliott Sigal | 775 | 12 May, 2025 | |
| Carolyn R Bertozzi | 775 | 12 May, 2025 | |
| Peter N Kellogg | 775 | 12 May, 2025 | |
| Colleen F Reitan | 775 | 11 Sep, 2025 | |
| Olivier Brandicourt | 775 | 12 May, 2025 | |
| Marsha Fanucci | 136 | 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 |
|---|---|---|---|---|---|---|---|---|
| 26 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 839 | $119.13 | 66,248 | D | M |
| 26 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 2,352 | $85.00 | 68,600 | D | M |
| 26 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 847 | $118.05 | 69,447 | D | M |
| 26 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 659 | $151.59 | 70,106 | D | M |
| 26 Nov, 2025 | Yvonne Greenstreet | Common Stock | D | 1,121 | $445.12 | 68,985 | D | F |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | A | 8,161 | $119.13 | 33,392 | D | M |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 8,168 | $449.00 | 25,224 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 96 | $450.09 | 25,128 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 129 | $451.51 | 24,999 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 368 | $455.24 | 24,631 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 364 | $456.25 | 24,267 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 262 | $457.39 | 24,005 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 794 | $458.41 | 23,211 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 622 | $459.89 | 22,589 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 707 | $460.84 | 21,882 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 323 | $461.96 | 21,559 | D | S |
| 17 Nov, 2025 | Kevin Joseph Fitzgerald | Common Stock | D | 295 | $463.08 | 21,264 | D | S |
| 12 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 650 | $42.22 | 66,059 | D | M |
| 12 Nov, 2025 | Yvonne Greenstreet | Common Stock | A | 15,000 | $119.13 | 81,059 | D | M |
| 12 Nov, 2025 | Yvonne Greenstreet | Common Stock | D | 711 | $448.07 | 80,348 | D | S |