DOSSIER · 13F Holders · Q3 2026

SURO CAPITAL CORP

4 institutions still hold SURO CAPITAL CORP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 86887Q909·4 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$378K
visible holders
Holders
4
filers reporting
Concentration
53.25%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

4 institutions reported SURO CAPITAL CORP in Q3 2026. GROUP ONE TRADING LLC leads at 53.3% 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
$201K26K0.00%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$143K19K0.00%Q3 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$34K4K0.00%Q3 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025