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.
Key figures
- Insider buysOpen market, last 90 days
- 0
- Insider sellsLast 90 days, $39.4K in total
- 3
- 13F holdersQ2 2026, −14 vs. previous quarter
- 141
- 13F valueReported value at the end of Q2 2026
- $46.8M
- Superinvestors holdingAt the end of Q2 2026
- 1
Price chart
Superinvestors holding QSI, Q2 2026
1 superinvestor reports holding Quantum-Si Inc on Form 13F. Percentages are the stock's share of each portfolio.
Latest insider trades
Open-market purchases and sales by Quantum-Si Inc insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 23, 2026 (view filing)7:51 PM ET | Sep 21-22 | 2 days | Hawkins Jeffrey AlanPresident & CEO | SSaleClass A Common Stock | −29.9K | $0.7574 | −$22.6K | −0.8%3.64M after | 2 lots |
| Sep 23, 2026 (view filing)7:45 PM ET | Sep 21-22 | 2 days | Keyes Jeffry R.Chief Financial Officer | SSaleClass A Common Stock | −7.67K | $0.7574 | −$5.81K | −0.4%1.72M after | 2 lots |
| Sep 23, 2026 (view filing)7:40 PM ET | Sep 21-22 | 2 days | LaPointe ChristianGC & Corp. Secretary | SSaleClass A Common Stock | −14.5K | $0.7574 | −$11.0K | −1.2%1.17M after | 2 lots |
| Jun 24, 2026 (view filing) | Jun 22-23 | 2 days | LaPointe ChristianGC & Corp. Secretary | SSaleClass A Common Stock | −15.6K | $0.93 | −$14.5K | −1.3%1.18M after | 2 lots |
| Jun 24, 2026 (view filing) | Jun 22-23 | 2 days | Keyes Jeffry R.Chief Financial Officer | SSaleClass A Common Stock | −8.23K | $0.93 | −$7.66K | −0.5%1.72M after | 2 lots |
| Jun 24, 2026 (view filing) | Jun 22-23 | 2 days | Vieceli John S.Chief Product Officer | SSaleClass A Common Stock | −30.2K | $0.93 | −$28.1K | −2.6%1.14M after | 2 lots |
| Jun 24, 2026 (view filing) | Jun 22-23 | 2 days | Hawkins Jeffrey AlanPresident & CEO | SSaleClass A Common Stock | −22.6K | $0.93 | −$21.0K | −0.6%3.67M after | 2 lots |
| Apr 22, 2026 (view filing) | Apr 20-21 | 2 days | Keyes Jeffry R.Chief Financial Officer | SSaleClass A Common Stock | −74.8K | $1.01 | −$75.1K | −4.1%1.73M after | 2 lots |
| Apr 22, 2026 (view filing) | Apr 20-21 | 2 days | Hawkins Jeffrey AlanPresident & CEO | SSaleClass A Common Stock | −167.4K | $1.01 | −$168.3K | −4.3%3.69M after | 2 lots |
| Mar 24, 2026 (view filing) | Mar 20-23 | 4 days | Keyes Jeffry R.Chief Financial Officer | SSaleClass A Common Stock | −8.65K | $0.8398 | −$7.27K | −0.5%1.81M after | 2 lots |
Top 10 13F holders, Q2 2026
The largest institutional positions in Quantum-Si Inc at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 7,578,208 | $6.71M | 0.00% | +556,301+7.9% | Added |
| ARK Investment Management LLCSuperinvestorARK Invest | 7,167,738 | $6.34M | 0.04% | +288,839+4.2% | Added |
| BlackRock, Inc. | 5,225,352 | $4.62M | 0.00% | −8,189,597−61.0% | Reduced |
| Nikko Asset Management Americas, Inc. | 3,885,230 | $3.46M | 0.04% | −506,436−11.5% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 3,885,230 | $3.44M | 0.00% | −506,436−11.5% | Reduced |
| Millennium Management LLC | 3,131,726 | $2.77M | 0.00% | +3,131,726 | New |
| UBS Group AG | 2,561,897 | $2.27M | 0.00% | +859,370+50.5% | Added |
| AQR Capital Management LLC | 2,348,665 | $2.08M | 0.00% | −43,514−1.8% | Reduced |
| Geode Capital Management, LLC | 2,236,526 | $1.98M | 0.00% | −1,598,595−41.7% | Reduced |
| Jane Street Group, LLC | 2,142,735 | $1.90M | 0.00% | +2,142,735 | New |