Alnylam Pharmaceuticals Ownership | Who Owns Alnylam Pharmaceuticals?
Alnylam Pharmaceuticals Ownership Summary
Alnylam Pharmaceuticals is owned by 21.83% institutional investors, 0.18% insiders, and 77.99% retail investors. Fmr is the largest institutional shareholder, holding 11.03% of ALNY shares. American Funds Growth Fund of Amer A is the top mutual fund, with 6.01% of its assets in Alnylam Pharmaceuticals shares.
ALNY Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Alnylam Pharmaceuticals | 21.83% | 0.18% | 77.99% |
| Sector | Healthcare Stocks | 35.58% | 11.87% | 52.55% |
| Industry | Biotech Stocks | 35.75% | 11.83% | 52.41% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Fmr | 14.58M | 11.03% | $4.82B |
| Vanguard group | 13.55M | 10.31% | $5.39B |
| Capital world investors | 10.80M | 8.17% | $3.57B |
| Blackrock funding, inc. /de | 10.44M | 7.90% | $3.46B |
| Blackrock | 9.55M | 7.57% | $2.32B |
| Capital research global investors | 9.47M | 7.16% | $3.13B |
| Jpmorgan chase | 6.32M | 4.78% | $2.00B |
| T. rowe price investment management | 5.19M | 3.93% | $1.72B |
| State street | 3.32M | 2.51% | $1.10B |
| Geode capital management | 2.66M | 2.01% | $884.57M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Prosight management, lp | 76.00K | 4.12% | $25.15M |
| Rosenblum silverman sutton s f inc /ca | 32.93K | 2.85% | $10.89M |
| Palo alto investors lp | 32.32K | 2.73% | $14.74M |
| Quantessence capital | 15.87K | 2.29% | $7.24M |
| Susquehanna advisors group | 286.10K | 2.00% | $130.46M |
| Casdin capital | 75.00K | 1.88% | $24.82M |
| Orbis allan gray | 1.33M | 1.86% | $441.65M |
| Bellevue group | 234.54K | 1.85% | $77.60M |
| Soleus capital management | 131.65K | 1.76% | $43.56M |
| Polymer capital management (hk) | 57.78K | 1.65% | $19.12M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| T. rowe price investment management | 5.19M | 1.18% | 3.44M |
| Capital research global investors | 9.47M | 0.49% | 2.69M |
| Norges bank | 2.25M | 0.10% | 2.25M |
| Jpmorgan chase | 6.32M | 0.13% | 1.60M |
| Two sigma investments, lp | 1.99M | 0.53% | 1.38M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Capital world investors | 10.80M | 0.49% | -5.50M |
| Regeneron pharmaceuticals | - | - | -1.39M |
| Fmr | 14.58M | 0.25% | -1.32M |
| Arrowstreet capital, limited partnership | - | - | -1.13M |
| Invesco | 1.29M | 0.07% | -874.11K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 2.25M | 0.10% | 2.25M | $895.82M |
| Vanguard fiduciary trust | 840.89K | 0.07% | 840.89K | $278.22M |
| Susquehanna advisors group | 286.10K | 2.00% | 286.10K | $130.46M |
| Vanguard asset management | 219.24K | 0.06% | 219.24K | $72.54M |
| Bank of america corp /de/ | 83.50K | 0.00% | 83.50K | $20.29M |
Sold Out
| Holder | Change |
|---|---|
| Rise advisors | -1.00 |
| Salem investment counselors | -1.00 |
| Bear mountain capital | -1.00 |
| Financial gravity asset management | -1.00 |
| Kohmann bosshard financial services | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2026 | 458 | -48.42% | 28,867,328 | -77.75% | 21 | 0.22% | 228 | -49.78% | 136 | -53.42% |
| Dec 31, 2025 | 684 | -20.56% | 91,965,556 | -31.27% | 69 | 0.66% | 343 | -32.61% | 232 | 5.45% |
| 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% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| American Funds Growth Fund of Amer A | 8.02M | 6.01% | -1.79M |
| Capital Group Growth Fnd of Amer Comp | 8.02M | 6.01% | -1.79M |
| Vanguard Total Stock Mkt Idx Inv | 4.23M | 3.17% | 10.13K |
| Vanguard US Total Market Shares ETF | 4.07M | 3.15% | 54.28K |
| VA CollegeAmerica Amcap 529A | 3.73M | 2.89% | 658.62K |
| Capital Group AMCAP Composite | 3.74M | 2.81% | 1.53M |
| American Funds AMCAP A | 3.74M | 2.81% | 1.53M |
| Vanguard Mid Cap Index Institutional | 2.87M | 2.15% | 6.42K |
| Invesco QQQ Trust | 2.84M | 2.13% | 20.86K |
| Capital Group New Perspective Comp | 2.39M | 1.80% | -370.32K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Apr 02, 2026 | McLaughlin Melissa | Chief Human Resources Officer | Sell | $66.56K |
| Apr 02, 2026 | McLaughlin Melissa | Chief Human Resources Officer | Sell | $27.49K |
| Apr 02, 2026 | McLaughlin Melissa | Chief Human Resources Officer | Sell | $83.90K |
| Apr 02, 2026 | McLaughlin Melissa | Chief Human Resources Officer | Sell | $113.96K |
| Apr 02, 2026 | McLaughlin Melissa | Chief Human Resources Officer | Sell | $47.13K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | 14 |
| 2026 Q1 | - | 228 |
| 2025 Q4 | - | 96 |
| 2025 Q3 | - | 80 |
| 2025 Q2 | - | 17 |
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