DOSSIER · 13F Holders · Q2 2026

COMPANHIA SIDERURGICA NACION

4 institutions still hold COMPANHIA SIDERURGICA NACION as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 20440W955·4 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$142K
visible holders
Holders
4
filers reporting
Concentration
91.47%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q2 2026

4 institutions reported COMPANHIA SIDERURGICA NACION in Q2 2026. SIMPLEX TRADING, LLC leads at 91.5% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
SIMPLEX TRADING, LLC
CIK 0001488542
$130K142K0.00%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$10K11K0.00%Q2 2026
03
Optiver Holding B.V.
CIK 0001859606· Market maker
$2K2K0.00%Q2 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025