DOSSIER · 13F Holders · Q2 2026

INTERACTIVE BROKERS GROUP IN

7 institutions still hold INTERACTIVE BROKERS GROUP IN as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 45841N907·7 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$103M
visible holders
Holders
7
filers reporting
Concentration
52.69%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

7 institutions reported INTERACTIVE BROKERS GROUP IN in Q2 2026. IMC-Chicago, LLC leads at 52.7% 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
$54M624K0.01%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$40M460K0.06%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$7M78K0.00%Q2 2026
04
SG Americas Securities, LLC
CIK 0001313360
$1M350K0.00%Q1 2026
05
CMT Capital Markets Trading GmbH
CIK 0001632813
$537K8K0.01%Q1 2026
06
OSAIC HOLDINGS, INC.
CIK 0001677044
$7K20.00%Q2 2026
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025