Quantum-Si incorporated (QSI) Stock Price History
Historical prices from 2020 to 2026
- 1M
- +17.0%
- 3M
- +11.6%
- YTD
- -13.9%
- 1Y
- -42.9%
- 3Y
- -11.5%
- 5Y
- -35.9%
Loading 10-year price history...
QSI Historical Performance
QSI Annual Returns
Year-by-year price performance · 2020–2026
- 2020 annual price return
- +2.7%
- 2021 annual price return
- -25.0%
- 2022 annual price return
- -77.7%
- 2023 annual price return
- +9.2%
- 2024 annual price return
- +33.0%
- 2025 annual price return
- -74.2%
- 2026 annual price return
- -17.6%
QSI Stock Price Trajectory (2020–2026)
As of June 23, 2026, Quantum-Si incorporated (QSI) trades at $0.92, representing a -42.9% return over the past year. The stock has delivered a -89.2% total return over five years (-35.9% CAGR), reflecting challenging market conditions.
The stock reached its all-time high of $25.00 on February 18, 2021. From this peak, QSI has corrected -96.3%, currently trading 25% below its 200-day moving average, suggesting potential weakness.
When compared to Healthcare sector peers PACB (+6.9% 1Y), CDNA (+37.6% 1Y), and ACMR (+336.2% 1Y), QSI has underperformed the peer group average. Compare QSI vs PACB →
QSI Historical Price Data · from 2020
Rows 1–50 of 1,406| Date | Open | High | Low | Close | Volume | Change % |
|---|---|---|---|---|---|---|
| 2026-06-22 | 1.00 | 1.07 | 0.92 | 0.92 | 5.78M | -7.79% |
| 2026-06-18 | 0.96 | 1.03 | 0.96 | 1.00 | 6.31M | +5.79% |
| 2026-06-17 | 0.97 | 1.00 | 0.93 | 0.94 | 3.40M | -1.02% |
| 2026-06-16 | 0.99 | 0.99 | 0.94 | 0.95 | 3.63M | -3.49% |
| 2026-06-15 | 1.02 | 1.04 | 0.98 | 0.99 | 9.40M | +4.42% |
| 2026-06-12 | 0.98 | 1.01 | 0.93 | 0.95 | 3.27M | -2.70% |
| 2026-06-11 | 0.94 | 0.98 | 0.92 | 0.97 | 3.33M | +2.80% |
| 2026-06-10 | 0.98 | 1.02 | 0.95 | 0.95 | 3.40M | -4.11% |
| 2026-06-09 | 1.06 | 1.08 | 0.94 | 0.99 | 8.01M | -6.88% |
| 2026-06-08 | 1.08 | 1.09 | 1.03 | 1.06 | 4.20M | +0.95% |
| 2026-06-05 | 1.21 | 1.22 | 1.01 | 1.05 | 8.81M | -17.97% |
| 2026-06-04 | 1.19 | 1.30 | 1.17 | 1.28 | 9.50M | +7.56% |
| 2026-06-03 | 1.22 | 1.22 | 1.17 | 1.19 | 7.87M | -4.03% |
| 2026-06-02 | 1.16 | 1.26 | 1.16 | 1.24 | 7.24M | +5.08% |
| 2026-06-01 | 1.17 | 1.25 | 1.12 | 1.18 | 7.33M | -0.84% |
| 2026-05-29 | 1.21 | 1.21 | 1.11 | 1.19 | 7.25M | -0.83% |
| 2026-05-28 | 1.09 | 1.21 | 1.08 | 1.20 | 7.27M | +6.19% |
| 2026-05-27 | 1.06 | 1.19 | 1.03 | 1.13 | 8.45M | +4.63% |
| 2026-05-26 | 1.08 | 1.09 | 1.01 | 1.08 | 7.42M | +1.89% |
| 2026-05-22 | 1.00 | 1.06 | 1.00 | 1.06 | 8.73M | +7.07% |
| 2026-05-21 | 0.87 | 0.99 | 0.87 | 0.99 | 11.06M | +13.05% |
| 2026-05-20 | 0.87 | 0.88 | 0.84 | 0.88 | 4.66M | +1.71% |
| 2026-05-19 | 0.84 | 0.87 | 0.82 | 0.86 | 3.08M | +0.83% |
| 2026-05-18 | 0.90 | 0.90 | 0.83 | 0.85 | 4.52M | -4.07% |
| 2026-05-15 | 0.91 | 0.91 | 0.88 | 0.89 | 3.66M | -4.59% |
| 2026-05-14 | 0.93 | 0.96 | 0.91 | 0.93 | 4.41M | +0.38% |
| 2026-05-13 | 0.93 | 0.96 | 0.90 | 0.93 | 4.83M | -1.60% |
| 2026-05-12 | 0.92 | 1.03 | 0.90 | 0.94 | 10.02M | +2.42% |
| 2026-05-11 | 0.89 | 0.94 | 0.89 | 0.92 | 5.71M | +1.72% |
| 2026-05-08 | 0.95 | 0.97 | 0.88 | 0.91 | 13.09M | -7.55% |
| 2026-05-07 | 1.03 | 1.03 | 0.96 | 0.98 | 7.04M | -4.80% |
| 2026-05-06 | 0.97 | 1.04 | 0.96 | 1.03 | 7.85M | +7.15% |
| 2026-05-05 | 0.98 | 0.98 | 0.95 | 0.96 | 2.48M | -1.05% |
| 2026-05-04 | 0.95 | 0.98 | 0.94 | 0.97 | 2.86M | +1.39% |
| 2026-05-01 | 0.98 | 1.00 | 0.94 | 0.96 | 3.56M | -2.28% |
| 2026-04-30 | 0.88 | 1.02 | 0.88 | 0.98 | 11.69M | +13.39% |
| 2026-04-29 | 0.90 | 0.90 | 0.86 | 0.86 | 3.40M | -5.18% |
| 2026-04-28 | 0.89 | 0.94 | 0.89 | 0.91 | 3.07M | +1.30% |
| 2026-04-27 | 0.91 | 0.94 | 0.87 | 0.90 | 3.08M | -0.61% |
| 2026-04-24 | 0.98 | 0.98 | 0.90 | 0.91 | 7.23M | -3.70% |
| 2026-04-23 | 1.02 | 1.04 | 0.92 | 0.94 | 7.24M | -11.26% |
| 2026-04-22 | 0.99 | 1.07 | 0.96 | 1.06 | 10.99M | +8.50% |
| 2026-04-21 | 1.00 | 1.05 | 0.97 | 0.98 | 5.09M | -3.27% |
| 2026-04-20 | 1.02 | 1.06 | 0.98 | 1.01 | 7.67M | -5.61% |
| 2026-04-17 | 1.06 | 1.14 | 1.06 | 1.07 | 6.89M | +2.88% |
| 2026-04-16 | 1.08 | 1.09 | 1.00 | 1.04 | 7.34M | -0.95% |
| 2026-04-15 | 0.90 | 1.06 | 0.90 | 1.05 | 17.21M | +24.88% |
| 2026-04-14 | 0.81 | 0.86 | 0.80 | 0.84 | 2.96M | +6.61% |
| 2026-04-13 | 0.73 | 0.80 | 0.72 | 0.79 | 2.56M | +6.51% |
| 2026-04-10 | 0.75 | 0.77 | 0.73 | 0.74 | 1.86M | -0.86% |
Intrinsic Valuation
DCF models, multiple analysis, and analyst estimates.
Historical Returns
10-year return with dividends reinvested.
DCA Calculator
See how regular investing compounds over time.
Peer Comparison
Compare growth, multiples, and margins vs sector.
QSI — Frequently Asked Questions
Quick answers to the most common questions about buying QSI stock.
How has QSI stock performed recently?
QSI declined -42.9% over the past year, below its 5-year annualized CAGR of -35.9%. The stock trades below its 200-day moving average, reflecting the downtrend.
What is QSI's all-time high price?
Quantum-Si incorporated reached $25.00 on 2021-02-18. The 52-week high is $3.10. Current 1-year return of -42.9% places the stock further from historical peaks.
Where can I download QSI historical price data?
This page provides QSI daily OHLCV data with 50-day MA, 200-day MA, and RSI indicators. Data spans 2020-2026, downloadable in CSV format.