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Alnylam Pharmaceuticals

802 hedge funds and large institutions have $59B invested in Alnylam Pharmaceuticals in 2025 Q3 according to their latest regulatory filings, with 221 funds opening new positions, 272 increasing their positions, 219 reducing their positions, and 48 closing their positions.

New
Increased
Maintained
Reduced
Closed

more first-time investments, than exits

New positions opened: | Existing positions closed:

more funds holding in top 10

Funds holding in top 10:

more capital invested

Capital invested by funds: $ → $

more funds holding

Funds holding:

24% more repeat investments, than reductions

Existing positions increased: 272 | Existing positions reduced: 219

2.48% less ownership

Funds ownership: 101.22%98.74% (-2.5%)

13% less call options, than puts

Call options by funds: $562M | Put options by funds: $649M

Holders
802
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
13
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$562M
Puts
$649M
Net Calls
Net Calls Change
Name Holding Trade Value Shares
Change
Change in
Stake
Aviva
101
Aviva
United Kingdom
$47.1M
EAM
102
Eventide Asset Management
Massachusetts
$46.4M
SEI Investments
103
SEI Investments
Pennsylvania
$43.1M
Barclays
104
Barclays
United Kingdom
$43.1M
WP
105
Woodline Partners
California
$41.9M
Canada Life
106
Canada Life
Manitoba, Canada
$41.6M
Nomura Asset Management
107
Nomura Asset Management
Japan
$41M
Westfield Capital Management
108
Westfield Capital Management
Massachusetts
$40.1M
PHP
109
Parkman Healthcare Partners
Connecticut
$40M
ACM
110
Aquatic Capital Management
Illinois
$38.3M
Assenagon Asset Management
111
Assenagon Asset Management
Luxembourg
$36.7M
Skandinaviska Enskilda Banken (SEB)
112
Skandinaviska Enskilda Banken (SEB)
Sweden
$36.3M
CI
113
Capital International
California
$35.7M
JG
114
Jain Global
New York
$35.6M
Mitsubishi UFJ Trust & Banking
115
Mitsubishi UFJ Trust & Banking
Japan
$35.3M
CII
116
Capital International Inc
California
$34.5M
RSCM
117
Rock Springs Capital Management
Maryland
$33.9M
HSBC Holdings
118
HSBC Holdings
United Kingdom
$33.3M
Man Group
119
Man Group
United Kingdom
$32.7M
Asset Management One
120
Asset Management One
Japan
$31.7M
State of Wisconsin Investment Board
121
State of Wisconsin Investment Board
Wisconsin
$31.2M
DM
122
Deerfield Management
New York
$31M
Ensign Peak Advisors
123
Ensign Peak Advisors
Utah
$30.9M
Manulife (Manufacturers Life Insurance)
124
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$30.9M
Lord, Abbett & Co
125
Lord, Abbett & Co
New Jersey
$30.7M