DOSSIER · 13F Holders · Q2 2026

ASP ISOTOPES INC

5 institutions still hold ASP ISOTOPES INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 00218A955·5 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$5M
visible holders
Holders
5
filers reporting
Concentration
46.76%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

5 institutions reported ASP ISOTOPES INC in Q2 2026. GROUP ONE TRADING LLC leads at 46.8% 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
$2M396K0.00%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$1M192K0.00%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$985K158K0.00%Q2 2026
04
NATIONAL BANK OF CANADA /FI/
CIK 0000926171
$622K1K0.00%Q2 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025