SuperworthQuantum-Si market cap QSI
Share price times shares outstanding: what the whole company sells for, since 2020.
- Today, Oct 23, 2026
- $306.4M
- Highest close in our data
- $1.3B
- Aug 2021
Quantum-Si is worth $306.4M at the close on Oct 23, 2026, at $1.40 a share.
That is down 34% over the last year and down 72% over five years.
Its highest close in our data was $1.3B in Aug 2021.
Market cap over time
Year by year
| Year | End of year | Low | High | Change |
|---|---|---|---|---|
| 2026 so far | $306.4M | $155.1M | $339.3M | +16% |
| 2025 | $265.1M | $196.9M | $612.2M | −48% |
| 2024 | $513.8M | $104.8M | $513.8M | +80% |
| 2023 | $284.9M | $162.3M | $488.2M | +11% |
| 2022 | $255.9M | $255.9M | $886.3M | −76% |
| 2021 | $1.1B | $117.8M | $1.3B | +621% |
| 2020 | $150M | $146M | $170M | n/a |
Against its peers
Companies in Industrial - Machinery nearest Quantum-Si's size, closest first, today.
| Company | Market cap |
|---|---|
| QSIQuantum-Si | $306.4M |
| TWINTwin Disc | $354M |
| PPIHPerma-Pipe International | $234.6M |
| LYTSLSI Industries | $755.3M |
| GHMGraham | $775.8M |
| PSIXPower Solutions International | $1.1B |
| TNCTennant | $1.1B |
| ENREnergizer | $1.5B |
| EPACEnerpac Tool | $1.8B |
| SPBSpectrum Brands | $1.8B |
| GRCGorman Rupp | $1.9B |
| Peer median | $1.1B |
What the market cap tells you
Share price times shares outstanding: what the whole company sells for today.
Size, not quality. Large caps move slower and are covered more. That is all it tells you.
More on Quantum-Si
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.