Stock listing
NASDAQ:QSI Quantum-Si Incorporated Stock
Home listing (NASDAQ) of Quantum-Si Incorporated
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Share price · NASDAQ:QSI
$1.46 USD -0.29 (-16.6%)
Close on Oct 30, 2026
- Day range
- $1.41 – $1.60 USDOct 30, 2026
- Volume
- 9.87M sharesOct 30, 2026
- Market cap
- $290.5M USDAt the close on Oct 30, 2026 · price × 198.9M shares outstanding
- 52-week range
- $0.69 – $2.19 USDLowest and highest trades, Oct 31, 2025 – Oct 30, 2026
- Traded on an average day
- $7.36M USDMedian day 2.84M shares · last 3 months, Jul 30, 2026 – Oct 30, 2026
Prices by listing
| Listing | Last | Change | Volume | Open | High | Low | Previous close | Price from |
|---|---|---|---|---|---|---|---|---|
| NASDAQ:QSI · Home | $1.46 USD | -0.29 (-16.6%) | 9,872,279 | $1.565 | $1.60 | $1.405 | $1.75 | Close on Oct 30, 2026 |
Daily closes
Last 3 months, Jul 30, 2026 – Oct 30, 2026 · NASDAQ:QSI · USD, adjusted for splits
| Day | Close | Change | % | Open | High | Low | Volume |
|---|---|---|---|---|---|---|---|
| $1.46 | -0.29 | -16.6% | $1.565 | $1.60 | $1.405 | 9,872,279 | |
| $1.75 | +0.03 | +1.7% | $1.681 | $1.81 | $1.66 | 8,495,392 | |
| $1.72 | +0.07 | +4.2% | $1.63 | $1.73 | $1.59 | 9,949,577 | |
| $1.65 | +0.19 | +13.0% | $1.50 | $1.75 | $1.495 | 16,461,938 | |
| $1.46 | +0.06 | +4.3% | $1.42 | $1.48 | $1.36 | 10,265,376 | |
| $1.40 | +0.25 | +21.7% | $1.155 | $1.42 | $1.15 | 11,414,800 | |
| $1.15 | -0.08 | -6.5% | $1.17 | $1.21 | $1.145 | 3,572,200 | |
| $1.23 | +0.07 | +6.0% | $1.16 | $1.23 | $1.16 | 3,422,700 | |
| $1.16 | +0.07 | +6.4% | $1.06 | $1.20 | $1.04 | 6,172,600 | |
| $1.09 | -0.03 | -2.7% | $1.145 | $1.15 | $1.01 | 8,714,000 | |
| $1.12 | -0.19 | -14.5% | $1.33 | $1.33 | $1.10 | 7,690,600 | |
| $1.31 | -0.08 | -5.8% | $1.35 | $1.39 | $1.24 | 9,269,400 | |
| $1.39 | -0.02 | -1.4% | $1.34 | $1.44 | $1.33 | 5,364,900 | |
| $1.41 | +0.05 | +3.7% | $1.345 | $1.46 | $1.31 | 6,239,600 | |
| $1.36 | -0.17 | -11.1% | $1.475 | $1.475 | $1.34 | 10,356,400 | |
| $1.53 | +0.31 | +25.4% | $1.26 | $1.66 | $1.258 | 40,903,900 | |
| $1.22 | -0.06 | -4.7% | $1.29 | $1.30 | $1.20 | 5,851,500 | |
| $1.28 | +0.06 | +4.9% | $1.17 | $1.31 | $1.09 | 8,037,000 | |
| $1.22 | -0.06 | -4.7% | $1.29 | $1.41 | $1.19 | 8,703,200 | |
| $1.28 | -0.27 | -17.4% | $1.525 | $1.53 | $1.26 | 19,185,000 | |
| $1.55 | +0.12 | +8.4% | $1.385 | $1.55 | $1.17 | 18,774,100 | |
| $1.43 | +0.36 | +33.6% | $1.20 | $1.48 | $1.15 | 33,063,400 | |
| $1.07 | +0.112 | +11.7% | $0.96 | $1.12 | $0.96 | 13,838,800 | |
| $0.958 | +0.163 | +20.5% | $0.805 | $1.03 | $0.805 | 23,007,100 | |
| $0.795 | -0.039 | -4.7% | $0.825 | $0.834 | $0.795 | 1,562,300 | |
| $0.834 | +0.049 | +6.2% | $0.794 | $0.84 | $0.776 | 2,593,500 | |
| $0.785 | +0.026 | +3.4% | $0.75 | $0.799 | $0.743 | 1,593,300 | |
| $0.759 | -0.026 | -3.3% | $0.79 | $0.805 | $0.752 | 1,476,500 | |
| $0.785 | +0.029 | +3.8% | $0.76 | $0.792 | $0.751 | 2,429,900 | |
| $0.756 | +0.011 | +1.5% | $0.759 | $0.766 | $0.75 | 1,122,800 | |
| $0.745 | -0.025 | -3.2% | $0.79 | $0.802 | $0.74 | 1,708,600 | |
| $0.77 | +0.04 | +5.5% | $0.75 | $0.796 | $0.75 | 2,823,600 | |
| $0.73 | +0.01 | +1.4% | $0.721 | $0.753 | $0.721 | 909,700 | |
| $0.72 | -0.005 | -0.7% | $0.72 | $0.741 | $0.72 | 1,164,700 | |
| $0.725 | -0.015 | -2.0% | $0.729 | $0.748 | $0.72 | 1,387,900 | |
| $0.74 | +0.001 | +0.1% | $0.739 | $0.755 | $0.739 | 1,069,100 | |
| $0.739 | -0.011 | -1.5% | $0.75 | $0.755 | $0.725 | 1,712,500 | |
| $0.75 | -0.01 | -1.3% | $0.76 | $0.775 | $0.746 | 1,441,900 | |
| $0.76 | -0.006 | -0.8% | $0.767 | $0.79 | $0.76 | 1,049,000 | |
| $0.766 | +0.005 | +0.7% | $0.76 | $0.774 | $0.76 | 897,300 | |
| $0.761 | 0.00 | 0.0% | $0.767 | $0.786 | $0.76 | 980,000 | |
| $0.761 | +0.004 | +0.5% | $0.759 | $0.785 | $0.75 | 1,615,600 | |
| $0.757 | -0.009 | -1.2% | $0.75 | $0.777 | $0.75 | 1,503,700 | |
| $0.766 | -0.014 | -1.8% | $0.779 | $0.78 | $0.763 | 1,133,200 | |
| $0.78 | -0.023 | -2.9% | $0.822 | $0.822 | $0.77 | 2,412,700 | |
| $0.803 | +0.012 | +1.5% | $0.791 | $0.834 | $0.79 | 1,373,600 | |
| $0.791 | -0.056 | -6.6% | $0.85 | $0.855 | $0.79 | 2,662,900 | |
| $0.847 | +0.078 | +10.1% | $0.789 | $0.859 | $0.782 | 4,366,300 | |
| $0.769 | -0.066 | -7.9% | $0.80 | $0.83 | $0.752 | 3,853,800 | |
| $0.835 | +0.055 | +7.1% | $0.785 | $0.931 | $0.78 | 7,825,100 | |
| $0.78 | +0.01 | +1.3% | $0.767 | $0.81 | $0.767 | 3,233,600 | |
| $0.77 | +0.042 | +5.8% | $0.719 | $0.785 | $0.719 | 2,863,200 | |
| $0.728 | -0.016 | -2.2% | $0.733 | $0.744 | $0.718 | 1,520,300 | |
| $0.744 | +0.004 | +0.5% | $0.74 | $0.795 | $0.739 | 2,429,700 | |
| $0.74 | -0.05 | -6.3% | $0.75 | $0.767 | $0.71 | 7,000,700 | |
| $0.79 | -0.047 | -5.6% | $0.855 | $0.914 | $0.79 | 4,378,300 | |
| $0.837 | +0.017 | +2.1% | $0.831 | $0.87 | $0.826 | 1,499,100 | |
| $0.82 | +0.03 | +3.8% | $0.795 | $0.849 | $0.795 | 2,056,300 | |
| $0.79 | -0.024 | -2.9% | $0.818 | $0.84 | $0.79 | 2,434,400 | |
| $0.814 | +0.059 | +7.8% | $0.762 | $0.829 | $0.762 | 2,730,100 | |
| $0.755 | -0.002 | -0.3% | $0.752 | $0.779 | $0.75 | 1,493,500 | |
| $0.757 | -0.008 | -1.0% | $0.775 | $0.793 | $0.757 | 2,484,800 | |
| $0.765 | +0.019 | +2.5% | $0.764 | $0.796 | $0.764 | 3,986,300 | |
| $0.746 | +0.034 | +4.8% | $0.72 | $0.76 | $0.711 | 2,706,300 | |
| $0.712 | -0.008 | -1.1% | $0.73 | $0.748 | $0.71 | 1,840,500 | |
| $0.72 | +0.018 | +2.6% | $0.726 | $0.744 | $0.69 | 3,550,000 |
- Ticker
- NASDAQ:QSI
- Asset type
- Stock
- Sector
- Health care
- Industry
- Diagnostics & research services
- Exchange
- NASDAQ
- Currency
- USD
What changed lately
Latest news release · Oct 16, 2026
Quantum-Si to Provide a Business Update and Report Third Quarter 2026 Financial Results on November 5, 2026
Latest earnings call · Aug 13, 2026
Quantum-si (NASDAQ:QSI) Q2 2026 Earnings Call
Replay and transcript
Latest deck · Sep 29, 2026
World HUPO 2026
Conference · 21 slides
Calls
Upcoming
Quantum-si (NASDAQ:QSI) Q3 2026 Earnings Call
Thu, Nov 05, 2026 · 4:30 PM ET
Register
Replays
Quantum-si (NASDAQ:QSI) Q2 2026 Earnings Call
Thu, Aug 13, 2026 · 4:30 PM ET
Watch TranscriptQuantum-si (NASDAQ:QSI) Q1 2026 Earnings Call
Thu, May 07, 2026 · 4:30 PM ET
Watch TranscriptQuantum-si (NASDAQ:QSI) Q4 2025 Earnings Call
Tue, Mar 03, 2026 · 4:30 PM ET
Watch Transcript
Latest news
Quantum-Si to Provide a Business Update and Report Third Quarter 2026 Financial Results on November 5, 2026
Oct 16, 2026
Closed $1.12 (-14.5%) on Oct 16, 2026
Quantum-Si Regains Compliance with Nasdaq Minimum Bid Price Requirement
Oct 15, 2026
Closed $1.31 (-5.8%) on Oct 15, 2026
Quantum-Si Demonstrates Detection of 19 Amino Acids in Proteus™ Development Program
Oct 8, 2026
Closed $1.53 (+25.4%) on Oct 9, 2026
Quantum-Si Presents Interim Proteus™ Data at World HUPO 2026 Demonstrating a Significant Step Change in Performance Compared to Platinum® Pro
Sep 28, 2026
Closed $0.958 (+20.5%) on Sep 29, 2026
Quantum-Si Announces Detection of 18 Amino Acids Using a Developmental Sequencing Kit on Proteus™
Sep 15, 2026
Closed $0.72 (-0.7%) on Sep 15, 2026
Quantum-Si Expands Proteus™ Roadshow with Additional U.S. and European Cities
Sep 9, 2026
Closed $0.75 (-1.3%) on Sep 9, 2026
Quantum-Si to Participate in the H.C. Wainwright 28th Annual Global Investment Conference
Aug 18, 2026
Closed $0.728 (-2.2%) on Aug 18, 2026
Quantum-Si Reports Second Quarter 2026 Financial Results and Provides Proteus™ Development Update
Aug 13, 2026
Closed $0.74 (-6.3%) on Aug 14, 2026
Quantum-Si to Report Second Quarter 2026 Financial Results on August 13, 2026
Jul 27, 2026
Closed $0.761 (-2.8%) on Jul 28, 2026
Quantum-Si and Cell Signaling Technology Partner to Advance Post-Translational Modification Analysis on Proteus™
Jun 10, 2026
Closed $0.947 (-4.1%) on Jun 10, 2026
Decks
World HUPO 2026
Conference · 21 slides · Sep 29, 2026
Investor Presentation (December 2025)
Investor deck · 23 slides · Dec 29, 2025
Investor Day (November 2025)
Investor day · 79 slides · Nov 20, 2025
Investor Day (November 2025)
Investor day · 79 slides · Nov 19, 2025
Quantum-Si Incorporated on 6ix
- Sector
- Health care
- Industry
- Diagnostics & research services
- News releases
- 28 in the last 12 months · 148 in all · newest Oct 16, 2026 · oldest 2021
- Calls
- 21 calls with a replay · 21 with a transcript · latest Aug 13, 2026
- Decks
- 14 decks · latest Sep 29, 2026
Where Quantum-Si Incorporated is listed
| Listing | Exchange | Country | Currency |
|---|---|---|---|
| NASDAQ:QSI · Home listing · This page | NASDAQ | United States | USD |
| BOATS:QSI | BOATS | United States | USD |
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