Stock profile

Quantum-Si Inc (QSI)

QSI · Latest close — as of Oct 13, 2026 · 13F data as of Jun 30, 2026 (2026 Q2)
Latest close
Data unavailable
No price in range
Tracked funds holding
0 of 149
2026 Q2 13F filings
Opened / added
0 / 0
vs previous quarter
Trimmed / exited
1
vs previous quarter

Super-investor holdings · 2026 Q2

No tracked fund reported a position in this stock in the latest 13F quarter.

Exited this quarter: Deerfield Management.

Short interest

Shares short · Sep 15, 202613,046,142
Days to cover10.32

Shares short at recent settlements — Jun 30, 2026: 17.4M · Jul 15, 2026: 14.1M · Jul 31, 2026: 15.4M · Aug 14, 2026: 14.3M · Aug 31, 2026: 14.4M · Sep 15, 2026: 13.0M.

Source: FINRA Equity Short Interest (biweekly settlement data).

Insider trading · Form 4

Data unavailable — no Form 4 transactions for this ticker were parsed in the 90 days to Oct 14, 2026.

Politician trading · U.S. Congress

Data unavailable — no congressional STOCK Act transactions for this ticker were parsed in the current window (as of Oct 3, 2026).

Screens & lenses

This stock does not currently pass any tracked screen.

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