13F Insight
DOSSIER · 13F Holders · Q1 2026Most-boughtAI cap-ex

ISHARES TR

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

CUSIP 464287905·14 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 6.6%
vs prior quarter
13F value held
$10.3B
60.0% inst. owned
of float
Holders
14
-43 QoQ
filers reporting
Activity
+45 / −21
+887 added · −793 reduced
this quarter
Concentration
64.95%
Optiver Holding B.V. #1
top holder share
AI Holders Summary · Q1 2026

14 institutions reported ISHARES TR in Q1 2026. Optiver Holding B.V. leads at 64.9% of the visible book. -43 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Optiver Holding B.V.
CIK 0001859606· Market maker
$6.7B27.9M2.32%Q1 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$1.4B7.2M0.51%Q1 202603
JPMORGAN CHASE & CO
CIK 0000019617
$905M5.3M0.06%Q1 202604
AKUNA SECURITIES LLC
CIK 0001529090
$736M3.0M1.67%Q1 202605
Maven Securities LTD
CIK 0001633046
$211M898K4.06%Q1 202606
Bracebridge Capital, LLC
CIK 0001426486
$207M8K5.56%Q1 202607
GROUP ONE TRADING LLC
CIK 0000932540
$103M1.2M0.20%Q1 202608
HIGHBRIDGE CAPITAL MANAGEMENT LLC
CIK 0000919185
$31M400K1.01%Q1 202609
HRT FINANCIAL LP
CIK 0001475597
$15M159K0.05%Q4 202510
PING CAPITAL MANAGEMENT, INC.
CIK 0001804352
$2M7K0.47%Q1 202611
Cassady Schiller Wealth Management, LLC
CIK 0001904425
$71,6989K0.03%Q4 202412
SG Americas Securities, LLC
CIK 0001313360
$24,9303.1M0.03%Q1 202613
OSAIC HOLDINGS, INC.
CIK 0001677044
$19,760280.00%Q1 202614
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025