Alnylam Pharmaceuticals Ownership | Who Owns Alnylam Pharmaceuticals?
Alnylam Pharmaceuticals Ownership Summary
Alnylam Pharmaceuticals is owned by 99.04% institutional investors, 1.47% insiders. Fmr is the largest institutional shareholder, holding 12.93% of ALNY shares. Capital Group Growth Fnd of Amer Comp is the top mutual fund, with 7.81% of its assets in Alnylam Pharmaceuticals shares.
ALNY Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Alnylam Pharmaceuticals | 99.04% | 1.47% | -0.52% |
| Sector | Healthcare Stocks | 42.50% | 10.81% | 46.69% |
| Industry | Biotech Stocks | 45.24% | 10.75% | 44.01% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Fmr | 16.77M | 12.93% | $7.65B |
| Capital world investors | 16.43M | 12.67% | $7.49B |
| Vanguard group | 13.57M | 10.46% | $6.19B |
| Blackrock funding, inc. /de | 9.90M | 7.64% | $4.52B |
| Blackrock | 9.55M | 7.57% | $2.32B |
| Capital research global investors | 7.22M | 5.57% | $3.29B |
| Jpmorgan chase | 4.54M | 3.50% | $2.07B |
| State street | 3.08M | 2.38% | $1.41B |
| Baillie gifford | 2.79M | 2.15% | $1.27T |
| Geode capital management | 2.50M | 1.93% | $1.14B |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Regeneron pharmaceuticals | 1.39M | 90.64% | $634.89M |
| Bellevue group | 446.52K | 4.23% | $203.61M |
| Parkman healthcare partners | 87.69K | 4.17% | $39.99M |
| Orbis allan gray | 1.95M | 3.82% | $889.64M |
| Rosenblum silverman sutton s f inc /ca | 34.00K | 3.54% | $15.50B |
| Orbimed advisors | 301.60K | 3.24% | $137.53M |
| Eagle health investments lp | 23.69K | 2.84% | $10.80M |
| Palo alto investors lp | 32.32K | 2.73% | $14.74M |
| Artia global partners lp | 34.57K | 2.50% | $15.76M |
| Quantessence capital | 15.87K | 2.29% | $7.24M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Jpmorgan chase | 4.54M | 0.12% | 2.48M |
| Norges bank | 2.46M | 0.08% | 2.46M |
| Arrowstreet capital, limited partnership | 1.36M | 0.39% | 1.19M |
| Fmr | 16.77M | 0.40% | 961.10K |
| Jane street group | 958.75K | 0.07% | 935.89K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Regeneron pharmaceuticals | 1.39M | 90.64% | -3.05M |
| T. rowe price investment management | 2.17M | 0.61% | -2.11M |
| Price t rowe associates inc /md/ | 1.80M | 0.09% | -1.34M |
| Winslow capital management | 1.33K | 0.00% | -1.18M |
| Dodge & cox | 2.32M | 0.57% | -875.87K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 2.46M | 0.08% | 2.46M | $577.94M |
| Massachusetts financial services co /ma/ | 356.53K | 0.05% | 356.53K | $162.58M |
| Susquehanna advisors group | 286.10K | 2.00% | 286.10K | $130.46M |
| Congress asset management co /ma | 118.80K | 0.36% | 118.80K | $54.17M |
| Bank of america corp /de/ | 83.50K | 0.00% | 83.50K | $20.29M |
Sold Out
| Holder | Change |
|---|---|
| Bear mountain capital | -1.00 |
| Kohmann bosshard financial services | -1.00 |
| Salem investment counselors | -1.00 |
| Financial gravity asset management | -1.00 |
| Harbor investment advisory | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 30, 2025 | 822 | 19.83% | 128,435,377 | -3.80% | 99 | 0.93% | 481 | 36.26% | 215 | -3.15% |
| Jun 30, 2025 | 685 | 2.09% | 133,478,551 | 3.70% | 102 | 1.04% | 354 | 1.14% | 220 | 10.00% |
| Mar 31, 2025 | 28 | -95.52% | 1,770,848 | -98.63% | 1 | 0.01% | 11 | -96.63% | 10 | -94.71% |
| Dec 31, 2024 | 603 | -0.33% | 129,230,860 | 5.02% | 100 | 1.10% | 315 | -2.78% | 183 | 6.40% |
| Sep 30, 2024 | 599 | 4.17% | 123,006,457 | 2.58% | 95 | 1.07% | 320 | 10.73% | 170 | 4.94% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Capital Group Growth Fnd of Amer Comp | 10.18M | 7.81% | - |
| American Funds Growth Fund of Amer A | 10.18M | 7.81% | - |
| Vanguard US Total Market Shares ETF | 4.07M | 3.15% | 54.28K |
| Vanguard Total Stock Mkt Idx Inv | 4.10M | 3.13% | -95.47K |
| VA CollegeAmerica Amcap 529A | 3.73M | 2.89% | 658.62K |
| Capital Group New Perspective Comp | 2.93M | 2.25% | - |
| American Funds New Perspective A | 2.93M | 2.25% | - |
| Vanguard Mid Cap Index Institutional | 2.91M | 2.22% | 31.33K |
| Capital Group AMCAP Composite | 2.40M | 1.84% | - |
| American Funds AMCAP A | 2.40M | 1.84% | - |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Nov 17, 2025 | Fitzgerald Kevin Joseph | CSO & EVP, Head of Research | Sell | $58.24K |
| Nov 17, 2025 | Fitzgerald Kevin Joseph | CSO & EVP, Head of Research | Sell | $167.53K |
| Nov 17, 2025 | Fitzgerald Kevin Joseph | CSO & EVP, Head of Research | Sell | $3.67M |
| Nov 17, 2025 | Fitzgerald Kevin Joseph | CSO & EVP, Head of Research | Sell | $43.21K |
| Nov 17, 2025 | Fitzgerald Kevin Joseph | CSO & EVP, Head of Research | Sell | $166.07K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q4 | - | 96 |
| 2025 Q3 | - | 80 |
| 2025 Q2 | - | 17 |
| 2025 Q1 | - | 152 |
| 2024 Q4 | - | 36 |
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