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Alnylam Pharmaceuticals

781 hedge funds and large institutions have $42.4B invested in Alnylam Pharmaceuticals in 2026 Q1 according to their latest regulatory filings, with 103 funds opening new positions, 319 increasing their positions, 254 reducing their positions, and 154 closing their positions.

New
Increased
Maintained
Reduced
Closed

more call options, than puts

Call options by funds: $ | Put options by funds: $

more repeat investments, than reductions

Existing positions increased: | Existing positions reduced:

less ownership

Funds ownership:

less funds holding

Funds holding:

18% less capital invested

Capital invested by funds: $51.7B → $42.4B (-$9.26B)

25% less funds holding in top 10

Funds holding in top 10: 43 (-1)

33% less first-time investments, than exits

New positions opened: 103 | Existing positions closed: 154

Holders
781
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
3
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$450M
Puts
$205M
Net Calls
Net Calls Change

Top Buyers

1 +$1.17B
2 +$916M
3 +$546M
4
Two Sigma Investments
Two Sigma Investments
New York
+$468M
5
ClearBridge Investments
ClearBridge Investments
New York
+$258M

Top Sellers

1 -$1.87B
2 -$450M
3 -$448M
4
Invesco
Invesco
Georgia
-$297M
5
1832 Asset Management
1832 Asset Management
Ontario, Canada
-$175M
Name Holding Trade Value Shares
Change
Change in
Stake
DekaBank Deutsche Girozentrale
101
DekaBank Deutsche Girozentrale
Germany
$38.1M
Aviva
102
Aviva
United Kingdom
$37.7M
State Board of Administration of Florida Retirement System
103
State Board of Administration of Florida Retirement System
Florida
$37.3M
BA
104
Bridgewater Associates
Connecticut
$35.3M
HighTower Advisors
105
HighTower Advisors
Illinois
$35M
SEI Investments
106
SEI Investments
Pennsylvania
$33.2M
TCG
107
Tremblant Capital Group
Florida
$31.3M
Neuberger Berman Group
108
Neuberger Berman Group
New York
$30.9M
Nomura Asset Management
109
Nomura Asset Management
Japan
$30.8M
Fidelity International
110
Fidelity International
Bermuda
$30.3M
HSBC Holdings
111
HSBC Holdings
United Kingdom
$29.6M
Los Angeles Capital Management
112
Los Angeles Capital Management
California
$29.2M
AAF
113
Andra AP-fonden
Sweden
$28.7M
QC
114
Quadrature Capital
United Kingdom
$28.2M
Mirae Asset Global ETFs Holdings
115
Mirae Asset Global ETFs Holdings
Hong Kong
$26.9M
Fiera Capital (Canada)
116
Fiera Capital (Canada)
Quebec, Canada
$26.1M
Natixis Advisors
117
Natixis Advisors
Massachusetts
$25.8M
PM
118
Prosight Management
Texas
$25.1M
CC
119
Casdin Capital
New York
$24.8M
Zurich Cantonal Bank
120
Zurich Cantonal Bank
Switzerland
$24.8M
LP
121
LMR Partners
United Kingdom
$24.7M
RSCM
122
Rock Springs Capital Management
Maryland
$24.5M
Mitsubishi UFJ Trust & Banking
123
Mitsubishi UFJ Trust & Banking
Japan
$24.1M
SSA
124
Schonfeld Strategic Advisors
New York
$23.7M
Jones Financial Companies
125
Jones Financial Companies
Missouri
$23.4M