ALNYLAM PHARMACEUTICALS, INC.
Total Trades
147
Buys
1
Sells
77
Largest Trade
N/A
Insiders
14
Institutional Funds
719
Inst. Value
$1M+
Activist Filings
18
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Garg Pushkal | EVP Chief R&D | SELL | $1M+ | 5K | $323.53 | Mar 6, 2026 |
| Greenstreet Yvonne | CEO | SELL | $500K+ | 3K | $323.08 | Mar 6, 2026 |
| Poulton Jeffrey V. | CFO | SELL | $500K+ | 2K | $323.08 | Mar 6, 2026 |
| Tanguler Tolga | EVP | SELL | $500K+ | 2K | $323.08 | Mar 6, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | SELL | $100K–$500K | 1K | $323.54 | Mar 6, 2026 |
| Poulton Jeffrey V. | CFO | GRANT | N/A | 5K | — | Mar 5, 2026 |
| Poulton Jeffrey V. | CFO | SELL | $500K+ | 2K | $327.65 | Mar 5, 2026 |
| Garg Pushkal | EVP Chief R&D | SELL | $1M+ | 3K | $323.63 | Mar 5, 2026 |
| Garg Pushkal | EVP Chief R&D | GRANT | N/A | 5K | — | Mar 5, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | SELL | $1M+ | 3K | $323.62 | Mar 5, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | GRANT | N/A | 4K | — | Mar 5, 2026 |
| Tanguler Tolga | EVP | GRANT | N/A | 5K | — | Mar 5, 2026 |
| Tanguler Tolga | EVP | SELL | $500K+ | 2K | $327.65 | Mar 5, 2026 |
| Greenstreet Yvonne | CEO | GRANT | N/A | 14K | — | Mar 5, 2026 |
| Greenstreet Yvonne | CEO | SELL | $1M+ | 7K | $327.65 | Mar 5, 2026 |
| Garg Pushkal | EVP Chief R&D | SELL | $1M+ | 5K | $331.34 | Mar 2, 2026 |
| Garg Pushkal | EVP Chief R&D | EXERCISE | N/A | 2K | — | Mar 2, 2026 |
| Garg Pushkal | EVP Chief R&D | GRANT | N/A | 5K | — | Feb 18, 2026 |
| Garg Pushkal | EVP Chief R&D | SELL | $500K+ | 2K | $310.08 | Feb 18, 2026 |
| Greenstreet Yvonne | CEO | GRANT | N/A | 14K | — | Feb 18, 2026 |
| Greenstreet Yvonne | CEO | SELL | $1M+ | 7K | $310.08 | Feb 18, 2026 |
| Garg Pushkal | EVP Chief R&D | GRANT | N/A | 4K | — | Jan 14, 2026 |
| Garg Pushkal | EVP Chief R&D | SELL | $500K+ | 2K | $362.87 | Jan 14, 2026 |
| Greenstreet Yvonne | CEO | GRANT | N/A | 19K | — | Jan 14, 2026 |
| Greenstreet Yvonne | CEO | SELL | $1M+ | 10K | $362.86 | Jan 14, 2026 |
| Poulton Jeffrey V. | CFO | GRANT | N/A | 6K | — | Jan 14, 2026 |
| Poulton Jeffrey V. | CFO | SELL | $1M+ | 3K | $362.87 | Jan 14, 2026 |
| Tanguler Tolga | EVP | GRANT | N/A | 4K | — | Jan 14, 2026 |
| Tanguler Tolga | EVP | SELL | $500K+ | 2K | $362.87 | Jan 14, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | GRANT | N/A | 4K | — | Jan 14, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | SELL | $1M+ | 4K | $367.37 | Jan 14, 2026 |
| Fitzgerald Kevin Joseph | CSO & EVP | EXERCISE | $500K+ | 8K | $119.13 | Nov 19, 2025 |
| Fitzgerald Kevin Joseph | CSO & EVP | SELL | $1M+ | 12K | $452.18 | Nov 19, 2025 |
| Greenstreet Yvonne | CEO | SELL | $1M+ | 26K | $452.75 | Nov 14, 2025 |
| Greenstreet Yvonne | CEO | EXERCISE | $1M+ | 26K | $117.18 | Nov 14, 2025 |
| Reitan Colleen F | Director | EXERCISE | $1M+ | 18K | $100.65 | Sep 11, 2025 |
| Reitan Colleen F | Director | SELL | $1M+ | 18K | $467.60 | Sep 11, 2025 |
| Tanguler Tolga | EVP | SELL | $1M+ | 3K | $448.37 | Sep 2, 2025 |
| Greenstreet Yvonne | CEO | SELL | $1M+ | 51K | $305.00 | Jun 3, 2025 |
| Greenstreet Yvonne | CEO | EXERCISE | $1M+ | 51K | $118.56 | Jun 3, 2025 |
| BONNEY MICHAEL W | Director | EXERCISE | $1M+ | 11K | $131.21 | May 19, 2025 |
| BONNEY MICHAEL W | Director | SELL | $1M+ | 11K | $277.71 | May 19, 2025 |
| Reitan Colleen F | Director | GRANT | N/A | 775 | — | May 12, 2025 |
| Reitan Colleen F | Director | SELL | $1K–$15K | 36 | $232.86 | May 12, 2025 |
| Reitan Colleen F | Director | BUY | $1K–$15K | 36 | $287.85 | May 12, 2025 |
| Garg Pushkal | CMO & EVP Dev & Me… | SELL | $1M+ | 10K | $293.36 | Mar 25, 2025 |
| Garg Pushkal | CMO & EVP Dev & Me… | EXERCISE | $100K–$500K | 5K | $42.22 | Mar 25, 2025 |
| PYOTT DAVID E I | Director | SELL | $1M+ | 7K | $299.00 | Mar 25, 2025 |
| PYOTT DAVID E I | Director | EXERCISE | $500K+ | 7K | $88.95 | Mar 25, 2025 |
| Garg Pushkal | CMO & EVP Dev & Me… | EXERCISE | $1M+ | 49K | $88.95 | Jan 29, 2025 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 719 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Capital World Investors | 16.3M | $1M+ | SH |
| Capital Research Global Investors | 6.8M | $1M+ | SH |
| STATE STREET CORP | 3.2M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3M | $1M+ | SH |
| NORGES BANK | 2.3M | $1M+ | SH |
| DODGE & COX | 2.0M | $1M+ | SH |
| AMERICAN CENTURY COMPANIES INC | 1.5M | $1M+ | SH |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.1M | $1M+ | SH |
| AQR CAPITAL MANAGEMENT LLC | 877K | $1M+ | SH |
| BAILLIE GIFFORD & CO | 654K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 648K | $1M+ | SH |
| Clearbridge Investments, LLC | 597K | $1M+ | SH |
| LOOMIS SAYLES & CO L P | 475K | $1M+ | SH |
| 1832 Asset Management L.P. | 440K | $1M+ | SH |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 401K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 389K | $1M+ | SH |
| WELLS FARGO & COMPANY/MN | 370K | $1M+ | SH (Call) |
| Swiss National Bank | 359K | $1M+ | SH |
| Squarepoint Ops LLC | 351K | $1M+ | SH |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 348K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Nov 5, 2025
12.8%
16.8M shares
SC 13G/A · Apr 7, 2025
10.0%
13.1M shares
Capital Research Global Investors
SC 13G · Feb 13, 2025
5.4%
7.0M shares
SC 13G/A · Nov 12, 2024
11.5%
14.8M shares
Wellington Management Group LLP
SC 13G/A · Nov 8, 2024
3.9%
5.0M shares
SC 13G/A · Aug 12, 2024
10.5%
13.3M shares
Baillie Gifford & Co (Scottish partnership)
SC 13G/A · Jul 5, 2024
4.8%
6.0M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
9.5%
11.9M shares
Capital World Investors 95-1411037
SC 13G/A · Feb 9, 2024
13.1%
16.4M shares
Baillie Gifford & Co (Scottish partnership)
SC 13G/A · Jan 29, 2024
5.5%
7.0M shares
SC 13G/A · Jan 26, 2024
6.8%
8.5M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2023
3.3%
4.1M shares
Capital World Investors 95-1411037
SC 13G/A · Feb 13, 2023
13.5%
16.6M shares
SC 13G/A · Jan 31, 2023
7.0%
8.7M shares
Baillie Gifford & Co (Scottish partnership)
SC 13G/A · Jan 19, 2023
7.7%
9.4M shares
Capital World Investors 95-1411037
SC 13G · Sep 9, 2022
10.7%
12.8M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G · Feb 14, 2022
5.4%
6.5M shares
Baillie Gifford & Co (Scottish partnership)
SC 13G/A · Jan 18, 2022
8.9%
10.6M shares