DOSSIER · 13F Holders · Q2 2026

COOPER STD HLDGS INC

4 institutions still hold COOPER STD HLDGS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 21676P953·4 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$2M
visible holders
Holders
4
filers reporting
Concentration
55.50%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

4 institutions reported COOPER STD HLDGS INC in Q2 2026. GROUP ONE TRADING LLC leads at 55.5% 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
$874K32K0.00%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$695K26K0.00%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$5K2000.00%Q2 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025