DOSSIER · 13F Holders · Q3 2026

CARMAX INC

5 institutions still hold CARMAX INC as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 143130902·5 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$58M
visible holders
Holders
5
filers reporting
Concentration
66.89%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q3 2026

5 institutions reported CARMAX INC in Q3 2026. IMC-Chicago, LLC leads at 66.9% 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
$39M705K0.01%Q3 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$10M184K0.01%Q3 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$8M154K0.01%Q2 2026
04
HRT FINANCIAL LP
CIK 0001475597
$973K25K0.00%Q4 2025
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025