QSI Quantum-Si Incorporated
NASDAQActiveClass A common stock
QSI is the ticker symbol of Quantum-Si Incorporated (class A common stock), which is listed on NASDAQ.
QSI at a glance
- Symbol
- QSI
- Company / issuer
- Quantum-Si Incorporated
- Security type
- Class A common stock
- Exchange
- NASDAQ
- Status
- Actively traded
- Seen in listing files
- Jun 2021 – present
- Sector
- Industrials
- Industry
- Industrial Machinery/Components
- Country
- United States
- IPO year
- 2020
- Market cap
- $171.8 million (Sep 2026)
Quantum-Si Incorporated company profile
- Industry (SIC)
- Measuring & Controlling Devices, NEC
- Headquarters
- Branford, CT
- Incorporated in
- DE
- Fiscal year end
- December 31
- SEC filer category
- Non-accelerated filer<br>Smaller reporting company
- Latest annual report
- 10-K filed 2026-03-03
- Latest interim report
- 10-Q filed 2026-08-13
- SEC CIK
- 1816431
Former company names
- HighCape Capital Acquisition Corp. (until 2021)
Source: SEC EDGAR filer data.
QSI price chart
Interactive chart provided by TradingView (loads third-party scripts).
Frequently asked questions
What company has the ticker symbol QSI?
QSI is the ticker symbol of Quantum-Si Incorporated on NASDAQ.
Is QSI still trading?
Yes. QSI appears in the current NASDAQ listings as of Sep 2026.
Which exchange is QSI listed on?
QSI is listed on NASDAQ.
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