13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Pharmaceutical PreparationsCyclicalNet sold
ALNY

ALNYLAM PHARMACEUTICALS INC

825 institutions still hold ALNYLAM PHARMACEUTICALS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 02043Q107·Pharmaceutical Preparations·825 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 7.4%
vs prior quarter
13F value held
$28.9B
62.0% inst. owned
of float
Holders
825
+29 QoQ
filers reporting
Activity
+35 / −15
+830 added · −860 reduced
this quarter
Concentration
16.70%
FMR LLC #1
top holder share
AI Holders Summary · Q1 2026

825 institutions reported ALNY in Q1 2026. FMR LLC leads at 16.7% of the visible book. +29 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
FMR LLC
CIK 0000315066
$4.8B14.6M0.25%Q1 202602
Capital World Investors
CIK 0001422849
$3.6B10.8M0.49%Q1 202603
BlackRock, Inc.
CIK 0002012383
$3.5B10.4M0.06%Q1 202604
Capital Research Global Investors
CIK 0001422848
$3.1B9.5M0.49%Q1 202605
Vanguard Portfolio Management
CIK 0002100121
$2.1B6.5M0.11%Q1 202606
JPMORGAN CHASE & CO
CIK 0000019617
$2.0B6.3M0.13%Q1 202607
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$2.0B5.9M0.05%Q1 202608
STATE STREET CORP
CIK 0000093751
$1.1B3.3M0.04%Q1 202609
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$885M2.7M0.06%Q1 202610
BAILLIE GIFFORD & CO
CIK 0001088875
$825M2.5M0.84%Q1 202611
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$659M2.0M0.53%Q1 202612
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$641M1.9M0.12%Q1 202613
DODGE & COX
CIK 0000200217
$638M1.9M0.35%Q1 202614
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$596M1.8M0.31%Q1 202615
TWO SIGMA ADVISERS, LP
CIK 0001478735
$450M1.1M0.88%Q4 202516
Clearbridge Investments, LLC
CIK 0001348883
$449M1.4M0.39%Q1 202617
Orbis Allan Gray Ltd
CIK 0001663865
$442M1.3M1.86%Q1 202618
Invesco Ltd.
CIK 0000914208
$427M1.3M0.07%Q1 202619
D. E. Shaw & Co., Inc.
CIK 0001009207
$335M843K0.18%Q4 202520
MORGAN STANLEY
CIK 0000895421
$332M1.0M0.02%Q1 2026
Page 1 of 42
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