QSI Stock Summary and Trading Ideas (Quantum-Si - Class A | NASDAQ:QSI)

Quantum-Si Inc is a life sciences company focused on proteomics research and analytical technologies. It develops single-molecule detection platforms designed to enable next-generation protein sequencing (NGPS) and large-scale protein analysis. Its technology supports massively parallel sequencing of proteins and can also be applied to the study of nucleic acids, providing tools for researchers and clinical applications in molecular analysis. The company's revenue is derived from sales of products and services.

Quantum-Si - Class A trades on the NASDAQ stock market under the symbol QSI.

As of June 4, 2026, QSI stock price climbed to $1.28 with 9,316,173 million shares trading.

QSI has a beta of 4.05, meaning it tends to be more sensitive to market movements. QSI has a correlation of 0.27 to the broad based SPY ETF.

QSI has a market cap of $278.73 million. This is considered a Small Cap stock.

Last quarter Quantum-Si - Class A reported $258,000 in Revenue and -$.10 earnings per share. This fell short of revenue expectation by $-61,200 and met earnings estimates .

In the last 3 years, QSI traded as high as $5.77 and as low as $.61.

The top ETF exchange traded funds that QSI belongs to (by Net Assets): ARKG, IWM, VTI, VXF, IWN.

QSI has underperformed the market in the last year with a return of -27.3%, while SPY returned +28.2%. This shows that you would have done better investing in the overall market (through SPY) over the last year than in QSI shares. However, QSI has outperformed the market in the last 3 month and 2 week periods, returning +35.0% and +46.2%, while SPY returned +11.5% and +2.1%, respectively. This indicates QSI has been having a stronger performance recently.

QSI support price is $1.12 and resistance is $1.26 (based on 1 day standard deviation move). This means that using the most recent 20 day stock volatility and applying a one standard deviation move around the stock's closing price, stastically there is a 67% probability that QSI shares will trade within this expected range on the day.