13F Insight
DOSSIER · 13F Holders · Q2 2026

ARM HOLDINGS PLC

13 institutions still hold ARM HOLDINGS PLC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 042068955·13 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$2.3B
visible holders
Holders
13
filers reporting
Concentration
45.53%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

13 institutions reported ARM HOLDINGS PLC in Q2 2026. IMC-Chicago, LLC leads at 45.5% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$1.0B2.9M0.25%Q2 202602
Optiver Holding B.V.
CIK 0001859606· Market maker
$368M1.0M0.10%Q2 202603
JPMORGAN CHASE & CO
CIK 0000019617
$294M856K0.02%Q2 202604
SIMPLEX TRADING, LLC
CIK 0001488542
$292M823K0.17%Q2 202605
GROUP ONE TRADING LLC
CIK 0000932540
$216M608K0.30%Q2 202606
CMT Capital Markets Trading GmbH
CIK 0001632813
$24M161K0.25%Q1 202607
Capital Markets Trading UK LLP
CIK 0001719165
$20M135K0.26%Q1 202608
NATIONAL BANK OF CANADA /FI/
CIK 0000926171
$12M3500.01%Q2 202609
OVERSEA-CHINESE BANKING Corp Ltd
CIK 0001291318
$7M20K0.14%Q2 202610
SG Americas Securities, LLC
CIK 0001313360
$2M1.9M0.00%Q1 202611
WESTERLY CAPITAL MANAGEMENT, LLC
CIK 0001546172
$2M5K0.33%Q2 202612
Marathon Trading Investment Management LLC
CIK 0001572748
$709K2K0.02%Q2 202613
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025