DOSSIER · 13F Holders · Q3 2026

THE ONCOLOGY INSTITUTE INC

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

CUSIP 68236X950·3 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$422K
visible holders
Holders
3
filers reporting
Concentration
41.53%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

3 institutions reported THE ONCOLOGY INSTITUTE INC in Q3 2026. GROUP ONE TRADING LLC leads at 41.5% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
GROUP ONE TRADING LLC
CIK 0000932540
$175K28K0.00%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$166K26K0.00%Q3 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$81K13K0.00%Q3 2026