ALNY icon

Alnylam Pharmaceuticals
ALNY

Overview Fund Activity

618 hedge funds and large institutions have $34.2B invested in Alnylam Pharmaceuticals in 2025 Q1 according to their latest regulatory filings, with 108 funds opening new positions, 236 increasing their positions, 197 reducing their positions, and 67 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
618
Holders Change
+33
Holders Change %
+5.64%
% of All Funds
8.4%
Holding in Top 10
10
Holding in Top 10 Change
+6
Holding in Top 10 Change %
+150%
% of All Funds
0.14%
New
108
Increased
236
Reduced
197
Closed
67
Calls
$274M
Puts
$238M
Net Calls
+$35.4M
Net Calls Change
+$6.38M

Top Buyers

1
Fidelity Investments
Fidelity Investments
Massachusetts
$4.13B
2
Bank of America
Bank of America
North Carolina
$287M
3
Invesco
Invesco
Georgia
$247M
4
Vanguard Group
Vanguard Group
Pennsylvania
$3.53B
5
Point72 Asset Management
Point72 Asset Management
Connecticut
$81.2M

Top Sellers

1
Wellington Management Group
Wellington Management Group
Massachusetts
$705M
2
Capital International Investors
Capital International Investors
California
$0
3
Baillie Gifford & Co
Baillie Gifford & Co
United Kingdom
$988M
4
BlackRock
BlackRock
New York
$2.58B
5
Corient Private Wealth
Corient Private Wealth
Florida
$11.5M
Name Holding Trade Value Shares
Change 		Shares
Change %
AP
76
Antipodes Partners
Australia
$43.1M +$6.97M +25,795 +19%
WP
77
Woodline Partners
California
$42.2M +$42.2M +156,464 New
Jacobs Levy Equity Management
78
Jacobs Levy Equity Management
New Jersey
$41.3M +$41.3M +152,970 New
DM
79
Deerfield Management
New York
$39.2M -$51.6K -191 -0.1%
1832 Asset Management
80
1832 Asset Management
Ontario, Canada
$38.9M +$38.9M +144,045 New
RSCM
81
Rock Springs Capital Management
Maryland
$38.7M -$30.5M -112,950 -44%
SG Americas Securities
82
SG Americas Securities
New York
$35.9M +$35.5M +131,293 +7,876%
Russell Investments Group
83
Russell Investments Group
United Kingdom
$34.9M +$15.1M +56,036 +77%
State Board of Administration of Florida Retirement System
84
State Board of Administration of Florida Retirement System
Florida
$33.8M – – –
CIS
85
Capital International Sarl
California
$32.7M +$1.62M +6,018 +5%
CC
86
Casdin Capital
New York
$32.4M -$5.4M -20,000 -14%
Fidelity International
87
Fidelity International
Bermuda
$31.8M +$25.9M +95,796 +434%
Universal-Beteiligungs- und Servicegesellschaft
88
Universal-Beteiligungs- und Servicegesellschaft
Germany
$31.8M -$1.79M -6,640 -5%
Handelsbanken Fonder
89
Handelsbanken Fonder
Sweden
$31.5M +$16.8M +62,337 +115%
HighTower Advisors
90
HighTower Advisors
Illinois
$30.7M -$411K -1,523 -1%
DekaBank Deutsche Girozentrale
91
DekaBank Deutsche Girozentrale
Germany
$30M -$40.1K -151 -0.1%
Mitsubishi UFJ Trust & Banking
92
Mitsubishi UFJ Trust & Banking
Japan
$29.9M -$1.63M -6,021 -5%
Ameriprise
93
Ameriprise
Minnesota
$29.5M -$5.11M -18,937 -15%
Mitsubishi UFJ Asset Management
94
Mitsubishi UFJ Asset Management
Japan
$28.6M +$3.02M +11,181 +12%
Korea Investment Corp
95
Korea Investment Corp
South Korea
$28.6M +$3.28M +12,156 +13%
Robeco Institutional Asset Management
96
Robeco Institutional Asset Management
Netherlands
$27.9M +$942K +3,487 +3%
FCM
97
Frontier Capital Management
Massachusetts
$27.7M -$621K -2,298 -2%
Manulife (Manufacturers Life Insurance)
98
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$26.7M -$2.76M -10,233 -9%
Jane Street
99
Jane Street
New York
$26.6M -$16.8M -62,086 -39%
Neuberger Berman Group
100
Neuberger Berman Group
New York
$26.6M -$3.04M -11,269 -10%
2 3
4
5 6