13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger

ALKERMES PLC

401 institutions still hold ALKERMES PLC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G01767105·401 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 6.5%
vs prior quarter
13F value held
$4.0B
49.0% inst. owned
of float
Holders
401
+57 QoQ
filers reporting
Activity
+8 / −6
+889 added · −780 reduced
this quarter
Concentration
24.79%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

401 institutions reported ALKERMES PLC in Q1 2026. BlackRock, Inc. leads at 24.8% of the visible book. +57 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$1.0B28.3M0.02%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$336M9.5M0.02%Q1 202603
STATE STREET CORP
CIK 0000093751
$335M9.5M0.01%Q1 202604
BAKER BROS. ADVISORS LP
CIK 0001263508
$280M10.0M1.64%Q4 202505
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$263M7.4M0.01%Q1 202606
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$218M6.2M0.34%Q1 202607
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$215M6.1M0.11%Q1 202608
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$160M4.5M0.03%Q1 202609
Commodore Capital LP
CIK 0001831942
$149M4.2M8.59%Q1 202610
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$148M4.2M0.01%Q1 202611
Deep Track Capital, LP
CIK 0001856083
$127M3.6M2.07%Q1 202612
JPMORGAN CHASE & CO
CIK 0000019617
$124M4.1M0.01%Q1 202613
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$105M3.0M0.02%Q1 202614
FIRST TRUST ADVISORS LP
CIK 0001125816· Index
$105M3.0M0.07%Q1 202615
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
$90M2.5M0.07%Q1 202616
Nuveen, LLC
CIK 0001871926
$87M2.5M0.02%Q1 202617
Holocene Advisors, LP
CIK 0001700574
$82M2.3M0.20%Q1 202618
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$79M2.2M0.01%Q1 202619
Soleus Capital Management, L.P.
CIK 0001802630
$70M2.0M2.82%Q1 202620
GOLDMAN SACHS GROUP INC
CIK 0000886982
$67M1.9M0.01%Q1 2026
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