QSI · NASDAQ
Quantum-Si (QSI) Stock Price & Fundamentals
Quantum-Si (QSI) closed at $264.22 on Oct 9, 2026, up 1.80% from the previous close of $259.55.
Share price, past year
1Y +7.86%Monthly closing prices
| Date | Close |
|---|---|
| Oct 9, 2026 | $264.22 |
| Sep 30, 2026 | $271.94 |
| Aug 31, 2026 | $275.56 |
| Jul 31, 2026 | $279.49 |
| Jun 30, 2026 | $279.59 |
| May 29, 2026 | $274.90 |
| Apr 30, 2026 | $263.09 |
| Mar 31, 2026 | $261.94 |
| Feb 27, 2026 | $275.86 |
| Jan 30, 2026 | $284.04 |
| Dec 31, 2025 | $275.87 |
| Nov 28, 2025 | $261.99 |
| Oct 31, 2025 | $251.22 |
Key statistics
- Market cap
- —
- P/E (TTM)
- —
- EPS (TTM)
- −$0.45
- Revenue (TTM)
- $1.61M
- Net income (TTM)
- −$98.52M
- Shares outstanding
- —
- Dividend yield
- —
- 52-week range
- $244.89 – $284.12
Financials
Quantum-Si reported revenue of $2.44M for fiscal 2025, down 20.34% from fiscal 2024.
Quantum-Si reported a net loss of $101.34M in fiscal 2025.
Annual revenue
| Fiscal year | Revenue | Growth | Net income | Net margin | EPS (diluted) | Free cash flow |
|---|---|---|---|---|---|---|
| FY2025ended Dec 31, 2025 | $2.44M | −20.3% | −$101.34M | −4,160.1% | −$0.51 | −$97.23M |
| FY2024ended Dec 31, 2024 | $3.06M | +182.6% | −$101.01M | −3,303.0% | −$0.71 | −$92.38M |
| FY2023ended Dec 31, 2023 | $1.08M | — | −$95.96M | −8,868.8% | −$0.68 | −$98.55M |
| FY2022ended Dec 31, 2022 | $0.00 | — | −$132.44M | — | −$0.95 | −$101.30M |
| FY2021ended Dec 31, 2021 | $0.00 | — | −$94.99M | — | −$1.19 | −$72.58M |
| Quarter | Revenue | Net income | EPS (diluted) |
|---|---|---|---|
| Q2 FY2026ended Jun 30, 2026 | $344.00K | −$23.53M | −$0.11 |
| Q1 FY2026ended Mar 31, 2026 | $258.00K | −$21.67M | −$0.10 |
| Q4 FY2025ended Dec 31, 2025 | $451.00K | −$17.61M | −$0.07 |
| Q3 FY2025ended Sep 30, 2025 | $552.00K | −$35.70M | −$0.17 |
| Q2 FY2025ended Jun 30, 2025 | $591.00K | −$28.84M | −$0.16 |
| Q1 FY2025ended Mar 31, 2025 | $842.00K | −$19.19M | −$0.11 |
| Q4 FY2024ended Dec 31, 2024 | $1.19M | −$33.12M | −$0.23 |
| Q3 FY2024ended Sep 30, 2024 | $787.00K | −$25.31M | −$0.18 |
Company profile
- Name
- Quantum-Si Inc
- Ticker
- QSI
- Exchange
- NASDAQ
- Industry (SEC SIC)
- Measuring & Controlling Devices, NEC
- Headquarters
- 29 Business Park Drive, Branford, CT 06405
- Incorporated in
- DE
- Fiscal year ends
- December
- SEC CIK
- 0001816431
Recent SEC filings
- Oct 8, 2026
- Sep 29, 2026
- Aug 13, 2026
- Aug 13, 2026
- Jul 24, 2026
- Jun 24, 2026
- May 15, 2026
- May 7, 2026
Frequently asked questions
What is Quantum-Si's stock price?
Quantum-Si (QSI) closed at $264.22 on Oct 9, 2026, up 1.80% from the previous close of $259.55.
How much revenue does Quantum-Si make?
Quantum-Si reported revenue of $2.44M for fiscal 2025, down 20.34% from fiscal 2024.
Does Quantum-Si pay a dividend?
Quantum-Si's recent filings report no dividends declared over the last four quarters.
Sources and methodology
Fundamentals come from Quantum-Si Inc's filings with the SEC (EDGAR XBRL company facts). Fourth-quarter figures that companies don't report separately are calculated as the fiscal year minus the first three quarters. Trailing twelve-month (TTM) figures sum the latest four quarters. Prices are generated sample data for development. Last updated Oct 9, 2026. Data sources and disclosures