QUANTUM-SI INC (QSI) Institutional Ownership and Insiders Activity

QUANTUM-SI INC (QSI) is widely held by institutional investors, with 140 firms reporting positions valued at approximately $46.79M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Vanguard Capital Management Llc is the largest disclosed holder, reporting approximately $6.71M in QSI holdings in its latest filing.

Recent insider activity includes 8 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.