John S. Vieceli insider trades: Quantum-Si (QSI) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where John reports to the SEC
Open-market buys and sales
8 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jun 23, 2026 | QSI | ↓ Sell | 30,223 | $0.93 | $28K | Direct | Jun 24, 2026 (1d) |
| Mar 23, 2026 | QSI | ↓ Sell | 21,997 | $0.84 | $18K | Direct | Mar 24, 2026 (1d) |
| Dec 22, 2025 | QSI | ↓ Sell | 21,927 | $1.28 | $28K | Direct | Dec 22, 2025 (0d) |
| Sep 23, 2025 | QSI | ↓ Sell | 19,686 | $1.66 | $33K | Direct | Sep 24, 2025 (1d) |
| Jun 23, 2025 | QSI | ↓ Sell | 21,923 | $1.61 | $35K | Direct | Jun 24, 2025 (1d) |
| Mar 21, 2025 | QSI | ↓ Sell | 4,317 | $1.39 | $6K | Direct | Mar 24, 2025 (3d) |
| Dec 23, 2024 | QSI | ↓ Sell | 4,306 | $1.29 | $6K | Direct | Dec 26, 2024 (3d) |
| Sep 24, 2024 | QSI | ↓ Sell | 4,309 | $0.94 | $4K | Direct | Sep 25, 2024 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other QSI insiders
Open-market trades in the last 12 months
About John S. Vieceli's insider trades
John S. Vieceli is Chief Product Officer at Quantum-Si (QSI). Since Sep 24, 2024, John has reported no open-market purchases and 8 sales worth $158K on SEC Form 4. In the last 12 months: 3 sales ($74K).
Their filings also include grants and awards (2 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every QSI insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.