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Alnylam Pharmaceuticals
ALNY

Overview Fund Activity

617 hedge funds and large institutions have $34.2B invested in Alnylam Pharmaceuticals in 2025 Q1 according to their latest regulatory filings, with 107 funds opening new positions, 236 increasing their positions, 197 reducing their positions, and 67 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
617
Holders Change
+32
Holders Change %
+5.47%
% of All Funds
8.38%
Holding in Top 10
10
Holding in Top 10 Change
+6
Holding in Top 10 Change %
+150%
% of All Funds
0.14%
New
107
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
+$493M
2
Bank of America
Bank of America
North Carolina
+$174M
3
Invesco
Invesco
Georgia
+$95.9M
4
Vanguard Group
Vanguard Group
Pennsylvania
+$87.3M
5
Point72 Asset Management
Point72 Asset Management
Connecticut
+$81.2M

Top Sellers

1
Wellington Management Group
Wellington Management Group
Massachusetts
-$428M
2
Capital International Investors
Capital International Investors
California
-$334M
3
Baillie Gifford & Co
Baillie Gifford & Co
United Kingdom
-$103M
4
BlackRock
BlackRock
New York
-$88M
5
Corient Private Wealth
Corient Private Wealth
Florida
-$63.7M
Name Holding Trade Value Shares
Change 		Shares
Change %
CIBC Asset Management
301
CIBC Asset Management
Ontario, Canada
$1.46M +$77.8K +288 +6%
PCM
302
Prelude Capital Management
New York
$1.46M +$161K +595 +12%
KIA
303
Knollwood Investment Advisory
Maryland
$1.45M – – –
BAMF
304
BI Asset Management Fondsmaeglerselskab
Denmark
$1.44M -$1.73M -6,413 -55%
MFG
305
Merit Financial Group
Georgia
$1.43M +$761K +2,819 +113%
SAM
306
Sectoral Asset Management
Quebec, Canada
$1.41M -$836K -3,095 -37%
DFCM
307
Dark Forest Capital Management
Puerto Rico
$1.39M +$1.39M +5,153 New
WBC
308
Westpac Banking Corp
Australia
$1.37M -$1.48M -5,487 -52%
PIM
309
Plato Investment Management
Australia
$1.27M -$242K -888 -16%
AC
310
Allstate Corporation
Illinois
$1.27M +$244K +903 +24%
US Bancorp
311
US Bancorp
Minnesota
$1.24M -$51.8K -192 -4%
CB
312
Commerce Bank
Missouri
$1.23M +$14.9K +55 +1%
OAC
313
OMERS Administration Corp
Ontario, Canada
$1.22M -$198K -735 -14%
Bank of Nova Scotia
314
Bank of Nova Scotia
Ontario, Canada
$1.22M -$1.62K -6 -0.1%
BM
315
Brandywine Managers
Delaware
$1.17M – – –
Citadel Advisors
316
Citadel Advisors
Florida
$1.14M -$16.5M -61,157 -94%
Focus Partners Wealth
317
Focus Partners Wealth
Massachusetts
$1.14M -$56.4K -209 -5%
A
318
AustralianSuper
Australia
$1.14M – – –
AI
319
Atria Investments
North Carolina
$1.14M +$241K +893 +27%
CL
320
Choreo LLC
Illinois
$1.13M -$153K -566 -12%
Arrowstreet Capital
321
Arrowstreet Capital
Massachusetts
$1.09M +$1.09M +4,055 New
HCM
322
Howland Capital Management
Massachusetts
$1.08M – – –
JPMIA
323
J.P. Marvel Investment Advisors
Massachusetts
$1.08M – – –
MWVC
324
Morgens Waterfall Vintiadis & Co
New York
$1.08M +$1.08M +4,000 New
CT
325
Clearstead Trust
Maine
$1.08M +$2.97K +11 +0.3%
11 12
13
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