Quantum-Si Inc
QSI- Exchange
- Nasdaq
- Industry
- Measuring & Controlling Devices, NEC
- SEC CIK
- 0001816431
In the last 90 days, Quantum-Si Inc insiders filed 0 open-market purchases and 3 sales; 141 institutions reported holding it in 13F filings for Q2 2026, worth $46.8M in total; ARK Invest is the only superinvestor holding it.
Superinvestors holding QSI, Q2 2026
1 superinvestor reports holding Quantum-Si Inc on Form 13F, worth $6.34M in total. Weight is Quantum-Si Inc's share of each 13F portfolio; actions compare shares with Q1 2026.
| Superinvestor | % of portfolio | Shares | Value | vs. previous quarter |
|---|---|---|---|---|
| ARK InvestCathie Wood | <0.1% | 7,167,738 | $6.34M | Added+4.2% |
Moves by quarter
Superinvestors that opened, added to, trimmed or sold out of QSI each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.
Q2 2026
1 superinvestor holding at quarter end
- Added
- ARK Invest (+4.2%)
Q1 2026
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−2.0%)
Q4 2025
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−7.9%)
Q3 2025
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−4.2%)
Q2 2025
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−8.6%)
Q1 2025
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−1.5%)
Q4 2024
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−25.3%)
Q3 2024
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−4.6%)
Q2 2024
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−2.8%)
Q1 2024
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−17.7%)
Q4 2023
1 superinvestor holding at quarter end
- Added
- ARK Invest (+7.4%)
Q3 2023
1 superinvestor holding at quarter end
- Added
- ARK Invest (+13.3%)
Q2 2023
1 superinvestor holding at quarter end
- Added
- ARK Invest (+9.0%)
Q1 2023
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−1.3%)
Q4 2022
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−10.4%)
Q3 2022
1 superinvestor holding at quarter end
- Reduced
- ARK Invest (−4.6%)
Q2 2022
1 superinvestor holding at quarter end
- Added
- ARK Invest (+3.7%)
Q1 2022
1 superinvestor holding at quarter end
- Added
- ARK Invest (+2.3%)
Q4 2021
1 superinvestor holding at quarter end
- Added
- ARK Invest (+2.9%)
Q3 2021
1 superinvestor holding at quarter end
- Added
- ARK Invest (+213.7%)
Q2 2021
1 superinvestor holding at quarter end
- New
- ARK Invest