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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 109 funds opening new positions, 235 increasing their positions, 197 reducing their positions, and 67 closing their positions.

Holders
618
Holders Change
+34
Holders Change %
+5.82%
% 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
109
Increased
235
Reduced
197
Closed
67
Calls
$274M
Puts
$238M
Net Calls
+$35.4M
Net Calls Change
+$6.38M

Top Buyers

1
Fidelity Investments
1
Fidelity Investments
Massachusetts
$4.13B
2
Bank of America
2
Bank of America
North Carolina
$287M
3
NL
3
Nuveen LLC
North Carolina
$149M
4
Invesco
4
Invesco
Georgia
$247M
5
Vanguard Group
5
Vanguard Group
Pennsylvania
$3.53B

Top Sellers

1
Norges Bank
1
Norges Bank
Norway
$0
2
Wellington Management Group
2
Wellington Management Group
Massachusetts
$705M
3
Capital International Investors
3
Capital International Investors
California
$0
4
Baillie Gifford & Co
4
Baillie Gifford & Co
United Kingdom
$988M
5
BlackRock
5
BlackRock
New York
$2.58B
Name Market Value Shares Shares
Change 		Shares
Change %
Capital World Investors
1
Capital World Investors
California
$4.52B 16,749,623 +149,098 +0.9%
Fidelity Investments
2
Fidelity Investments
Massachusetts
$4.13B 15,309,860 +1,823,957 +14%
Vanguard Group
3
Vanguard Group
Pennsylvania
$3.53B 13,056,605 +323,206 +3%
BlackRock
4
BlackRock
New York
$2.58B 9,559,382 -325,875 -3%
Capital Research Global Investors
5
Capital Research Global Investors
California
$1.93B 7,154,728 +186,215 +3%
RP
6
Regeneron Pharmaceuticals
New York
$1.2B 4,444,445 – –
T. Rowe Price Investment Management
7
T. Rowe Price Investment Management
Maryland
$1.19B 4,418,145 +33,696 +0.8%
Baillie Gifford & Co
8
Baillie Gifford & Co
United Kingdom
$988M 3,657,607 -382,652 -9%
T. Rowe Price Associates
9
T. Rowe Price Associates
Maryland
$946M 3,505,168 +185,783 +6%
State Street
10
State Street
Massachusetts
$909M 3,366,583 -56,294 -2%
Dodge & Cox
11
Dodge & Cox
California
$905M 3,351,762 -188,500 -5%
Wellington Management Group
12
Wellington Management Group
Massachusetts
$705M 2,610,986 -1,585,637 -38%
Geode Capital Management
13
Geode Capital Management
Massachusetts
$626M 2,322,834 +116,034 +5%
JPMorgan Chase & Co
14
JPMorgan Chase & Co
New York
$599M 2,218,872 -31,188 -1%
American Century Companies
15
American Century Companies
Missouri
$475M 1,760,435 +156,411 +10%
OAG
16
Orbis Allan Gray
Bermuda
$441M 1,634,923 +162,121 +11%
Winslow Capital Management
17
Winslow Capital Management
Minnesota
$321M 1,187,178 +166,611 +16%
Bank of America
18
Bank of America
North Carolina
$287M 1,064,573 +646,021 +154%
Invesco
19
Invesco
Georgia
$247M 913,792 +355,302 +64%
Legal & General Group
20
Legal & General Group
United Kingdom
$238M 881,111 +52,194 +6%
Northern Trust
21
Northern Trust
Illinois
$234M 865,020 -13,840 -2%
AQR Capital Management
22
AQR Capital Management
Connecticut
$217M 828,344 +14,988 +2%
BG
23
Bellevue Group
Switzerland
$207M 768,147 -2,121 -0.3%
UBS AM
24
UBS AM
Illinois
$199M 736,111 +25,513 +4%
Morgan Stanley
25
Morgan Stanley
New York
$173M 641,765 -85,459 -12%
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