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

Quantum-Si Inc is a life sciences company focused on the development and commercialization of proteomics research tools. The company has designed and developed a hardware, consumable, and software solution to provide a solution for protein detection and analysis. It has developed a proprietary universal single-molecule detection platform that enables Next-Generation Protein Sequencing (NGPS), the ability to sequence proteins.

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

As of February 20, 2026, QSI stock price declined to $0.94 with 1,608,700 million shares trading.

QSI has a beta of 2.21, meaning it tends to be more sensitive to market movements. QSI has a correlation of 0.17 to the broad based SPY ETF.

QSI has a market cap of $202.73 million. This is considered a Small Cap stock.

Last quarter Quantum-Si - Class A reported $552,000 in Revenue and -$.17 earnings per share. This fell short of revenue expectation by $-35,598 and missed earnings estimates by -$.03.

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, VTI, IWM, VXF, IWN.

QSI has underperformed the market in the last year with a price return of -50.7% while the SPY ETF gained +13.7%. QSI has also underperformed the stock market ETF in the last 3 month and 2 week periods returning -26.5% and +0.9%, respectively, while the SPY returned +4.3% and +1.7%, respectively.

QSI support price is $.91 and resistance is $1.01 (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.