DOSSIER · 13F Holders · Q3 2026

INTERACTIVE BROKERS GROUP IN

8 institutions still hold INTERACTIVE BROKERS GROUP IN as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 45841N907·8 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$140M
visible holders
Holders
8
filers reporting
Concentration
56.41%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q3 2026

8 institutions reported INTERACTIVE BROKERS GROUP IN in Q3 2026. IMC-Chicago, LLC leads at 56.4% 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
$79M924K0.02%Q3 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$39M458K0.05%Q3 2026
03
HRT FINANCIAL LP
CIK 0001475597
$12M145K0.02%Q3 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$8M88K0.00%Q3 2026
05
SG Americas Securities, LLC
CIK 0001313360
$1M350K0.00%Q1 2026
06
CMT Capital Markets Trading GmbH
CIK 0001632813
$537K8K0.01%Q1 2026
07
OSAIC HOLDINGS, INC.
CIK 0001677044
$7K20.00%Q3 2026
08
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025