DOSSIER · 13F Holders · Q2 2026
QUANTUM SI INC
5 institutions still hold QUANTUM SI INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.
CUSIP 74765K905·5 13F holders·last filed Jun 30, 2026
AI Holders Summary · Q2 2026
5 institutions reported QUANTUM SI INC in Q2 2026. GROUP ONE TRADING LLC leads at 52.9% of the visible book.
Top holders
Sorted by position value. Source: SEC EDGAR 13F-HR filings.