Quantum-Si
QSI · NASDAQ
$1.16+$0.07 (+6.42%)TodayMarket closed ·
Prev close $1.09
Who owns QSI
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 23.1% of QSI’s shares.
- Rothberg (Jonathan M)6.3%
- Vanguard Capital Management, LLC3.5%
- ARK Investment Management LLC3.3%
- BlackRock Institutional Trust Company, N.A.2.2%
- Next 6 largest institutions7.8%
- All other shareholders76.9%
| Holder | Shares | % of shares |
|---|---|---|
| Rothberg (Jonathan M) | 13.71M | 6.29% |
| Vanguard Capital Management, LLC | 7.58M | 3.48% |
| ARK Investment Management LLC | 7.17M | 3.29% |
| BlackRock Institutional Trust Company, N.A. | 4.86M | 2.23% |
| Amova Asset Management Co., Ltd. | 3.89M | 1.78% |
| Millennium Management LLC | 3.13M | 1.44% |
| Rakin (Kevin L) | 2.92M | 1.34% |
| UBS Financial Services, Inc. | 2.52M | 1.16% |
| AQR Capital Management, LLC | 2.35M | 1.08% |
| Geode Capital Management, L.L.C. | 2.24M | 1.03% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| ARK Genomic Revolution ETF | 7.15M | 3.28% |
| Vanguard Total Stock Market Index Fund | 5.35M | 2.46% |
| Amova ARK Positive Change Innovation Fund | 3.54M | 1.63% |
| Vanguard Extended Market Index Fund | 2.07M | 0.95% |
| iShares Biotechnology ETF | 1.26M | 0.58% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $352.93K (18 trades) of QSI on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| LaPointe Christian | Sale | 4.72K | $3.59K |
| Keyes Jeffry R. | Sale | 2.49K | $1.90K |
| Hawkins Jeffrey Alan | Sale | 9.71K | $7.39K |
| LaPointe Christian | Sale | 9.79K | $7.40K |
| Keyes Jeffry R. | Sale | 5.17K | $3.91K |
| Hawkins Jeffrey Alan | Sale | 20.14K | $15.22K |
| LaPointe Christian | Sale | 7.79K | $7.01K |
| Vieceli John S. | Sale | 15.11K | $13.59K |
| Keyes Jeffry R. | Sale | 4.12K | $3.70K |
| Hawkins Jeffrey Alan | Sale | 11.31K | $10.17K |
Short interest
Settled Sep 30, 2026
- Shares short
- 11.83M
- Days to cover
- 2.46
- % of shares outstanding
- 5.43%
- Average daily volume
- 4.80M
- Change since last report
- −9.3%
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