ALNYLAM PHARMACEUTICALS INC (ALNY) Stock Institutional Trading Activity
ALNYLAM PHARMACEUTICALS INC (ALNY) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Dodge & Cox Stock Fund, Polen Capital Management, Parnassus Endeavor Fund, Sequoia Financial Advisors, and First Eagle U.S. Value. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- ALNYLAM PHARMACEUTICALS INC (ALNY) stock institutional ownership
- ALNYLAM PHARMACEUTICALS INC (ALNY) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q2 2017 | ARK Invest | Sell | -948 | 5,276 | $421 |
| Q1 2017 | Dodge & Cox Stock Fund | Buy | 194,295 | 9,399,245 | $481,711 |
| Q1 2017 | ARK Invest | Sell | -117,506 | 6,224 | $319 |
| Q1 2017 | Renaissance Technologies LLC | Buy | 32,427 | 51,100 | $2,619 |
| Q4 2016 | Dodge & Cox Stock Fund | Buy | 3,928,882 | 9,204,950 | $344,633 |
| Q4 2016 | ARK Invest | Buy | 123,730 | 123,730 | $4,632 |
| Q3 2016 | Dodge & Cox Stock Fund | Buy | 2,759,399 | 5,276,068 | $357,612 |
| Q2 2016 | Dodge & Cox Stock Fund | Buy | 2,516,669 | 2,516,669 | $139,650 |
| Q2 2016 | Renaissance Technologies LLC | Sell | -195,327 | 18,673 | $1,036 |
| Q1 2016 | Renaissance Technologies LLC | Buy | 111,601 | 214,000 | $13,433 |
| Q4 2015 | Mairs & Power Growth Fund | Buy | 100 | 2,300 | $217 |
| Q2 2015 | Renaissance Technologies LLC | Sell | -56,301 | 102,399 | $12,275 |
| Q4 2014 | Mairs & Power Growth Fund | Buy | 2,200 | 2,200 | $213 |
| Q1 2014 | Renaissance Technologies LLC | Buy | 158,700 | 158,700 | $10,655 |
Frequently asked questions about ALNY activity
Which institutional owners are buying ALNY?
Institutional owners buying ALNY include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in ALNY activity?
"Buy" means an investor increased their reported position in ALNY compared to the prior reporting period. This reflects growing exposure to ALNYLAM PHARMACEUTICALS INC (ALNY) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in ALNY increasing?
Institutional interest in ALNY can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.