13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Biological Products, (No Diagnostic Substances)BellwetherCompounder
ACLX

ARCELLX INC

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

CUSIP 03940C100·Biological Products, (No Diagnostic Substances)·244 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 5.1%
vs prior quarter
13F value held
$4.9B
65.0% inst. owned
of float
Holders
244
+140 QoQ
filers reporting
Activity
+93 / −107
+878 added · −830 reduced
this quarter
Concentration
15.70%
GILEAD SCIENCES, INC. #1
top holder share
AI Holders Summary · Q1 2026

244 institutions reported ACLX in Q1 2026. GILEAD SCIENCES, INC. leads at 15.7% of the visible book. +140 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
GILEAD SCIENCES, INC.
CIK 0000882095
$772M6.7M36.44%Q1 202602
Paradigm Biocapital Advisors LP
CIK 0001855655
$663M5.8M13.55%Q1 202603
BlackRock, Inc.
CIK 0002012383
$453M3.9M0.01%Q1 202604
NEA Management Company, LLC
CIK 0001512848
$350M3.0M19.88%Q1 202605
Pentwater Capital Management LP
CIK 0001425851
$330M2.9M1.71%Q1 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$278M2.4M0.01%Q1 202607
Vanguard Portfolio Management
CIK 0002100121· Index
$278M2.4M0.01%Q1 202608
SR ONE CAPITAL MANAGEMENT, LP
CIK 0001910264
$269M2.3M29.43%Q1 202609
FIL Ltd
CIK 0000318989
$269M2.3M0.21%Q1 202610
HBK INVESTMENTS L P
CIK 0001011443
$262M2.3M2.65%Q1 202611
STATE STREET CORP
CIK 0000093751
$192M1.7M0.01%Q1 202612
GOLDMAN SACHS GROUP INC
CIK 0000886982
$157M1.4M0.02%Q1 202613
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$118M1.0M0.01%Q1 202614
MORGAN STANLEY
CIK 0000895421
$106M926K0.01%Q1 202615
CITADEL ADVISORS LLC
CIK 0001423053
$100M1.5M0.01%Q4 202516
JPMORGAN CHASE & CO
CIK 0000019617
$68M594K0.00%Q1 202617
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$66M572K0.01%Q1 202618
DAVIDSON KEMPNER CAPITAL MANAGEMENT LP
CIK 0001595082
$64M560K0.88%Q1 202619
TIG Advisors, LLC
CIK 0001358253
$62M541K2.87%Q1 202620
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$58M503K0.02%Q1 2026
Page 1 of 13
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