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Closing prices for 09 October 2026
Next earnings report: 04 November 2026 · Earnings calendar
The series is stated in the current share scale after splits; dividends are not included in the price
Quantum-Si Incorporated trades on Nasdaq under the ticker QSI. The company belongs to the Technology sector. The trading history on this page starts on 13 November 2020.
Over the past 52 weeks QSI has traded between 0.6900 $ and 3.10 $. As of 09 October 2026 the price stood 34.85 % of the way from the 52-week low to the high.
Over one year QSI shares fell 13.56 %; over six months they rose 106.48 %. Volatility over 90 days is 106.61 %. Dividends are not included: this is price change only, as of 09 October 2026.
The company reported a loss over the last four quarters, so a price-to-earnings ratio is not calculated. Price to sales is 144, above the sector median of 3.6. Price to book is 1.3, below the sector median of 3.9. Calculated from reports for the period ending 31 March 2026.
| Date | Open | High | Low | Close | Volume, shares |
|---|---|---|---|---|---|
| 09 October 2026 | 1.26 | 1.66 | 1.26 | 1.53 | 41M |
| 08 October 2026 | 1.29 | 1.30 | 1.20 | 1.22 | 6M |
| 07 October 2026 | 1.17 | 1.31 | 1.09 | 1.28 | 8M |
| 06 October 2026 | 1.29 | 1.41 | 1.19 |
Based on the last 12 months of reports, through 31 March 2026
The sector median covers every company in the sector on the US market, loss-making ones included.
Share count is a period average, so market cap is approximate.
Address:29 BUSINESS PARK DRIVE, BRANFORD, CT, 06405, US
Quantum-Si Incorporated reported revenue of 2M $ and a net loss of 104M $ over the last four quarters. Net margin is −5,605.89 %. Revenue changed by −46.21 % year over year. Earnings per share are −0.50 $. Market capitalisation is 267M $.
QSI has a return on equity of −51.72 %, below the sector median of 1.63 %. Return on assets is −48.66 %, below the sector median of 0.49 %. Operating margin is −6,211.66 %, below the sector median of 1.10 %.
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| 1.22 |
| 9M |
| 05 October 2026 | 1.53 | 1.53 | 1.26 | 1.28 | 19M |
| 02 October 2026 | 1.39 | 1.55 | 1.17 | 1.55 | 19M |
| 01 October 2026 | 1.20 | 1.48 | 1.15 | 1.43 | 33M |
| 30 September 2026 | 0.9600 | 1.12 | 0.9600 | 1.07 | 14M |
| 29 September 2026 | 0.8050 | 1.03 | 0.8050 | 0.9580 | 23M |
| 28 September 2026 | 0.8250 | 0.8340 | 0.7950 | 0.7950 | 2M |
| 25 September 2026 | 0.7940 | 0.8400 | 0.7760 | 0.8340 | 3M |
| 24 September 2026 | 0.7500 | 0.7990 | 0.7430 | 0.7850 | 2M |
| 23 September 2026 | 0.7900 | 0.8050 | 0.7520 | 0.7590 | 1M |
| 22 September 2026 | 0.7600 | 0.7920 | 0.7510 | 0.7850 | 2M |
| 21 September 2026 | 0.7590 | 0.7660 | 0.7500 | 0.7560 | 1M |
| 18 September 2026 | 0.7900 | 0.8020 | 0.7400 | 0.7450 | 2M |
| 17 September 2026 | 0.7500 | 0.7960 | 0.7500 | 0.7700 | 3M |
| 16 September 2026 | 0.7210 | 0.7530 | 0.7210 | 0.7300 | 909,700 |
| 15 September 2026 | 0.7200 | 0.7410 | 0.7200 | 0.7200 | 1M |
| 14 September 2026 | 0.7290 | 0.7480 | 0.7200 | 0.7250 | 1M |