Quantum-Si (NASDAQ:QSI) adds US$32m to market cap in the past 7 days, though investors from five years ago are still down 88%

This week we saw the Quantum-Si incorporated (NASDAQ:QSI) share price climb by 14%. But will that heal all the wounds inflicted over 5 years of declines? Unlikely. Indeed, the share price is down a whopping 88% in that time. The recent bounce might mean the long decline is over, but we are not confident. The million dollar question is whether the company can justify a long term recovery. We really feel for shareholders in this scenario. It's a good reminder of the importance of diversification, and it's worth keeping in mind there's more to life than money, anyway. While the stock has risen 14% in the past week but long term shareholders are still in the red, let's see what the fundamentals can tell us. AI is about to change healthcare. These 20 stocks are working on everything from early diagnostics to drug discovery. The best part - they are all under $10bn in marketcap - there is still time to get in early. Given that Quantum-Si didn't make a profit in the last twelve months, we'll focus on revenue growth to form a quick view of its business development. When a company doesn't make profits, we'd generally hope to see good revenue growth. That's because fast revenue growth can be easily extrapolated to forecast profits, often of considerable size. Over five years, Quantum-Si grew its revenue at 77% per year. That's better than most loss-making companies. So on the face of it we're really surprised to see the share price has averaged a fall of 13% each year, in the same time period. It could be that the stock was over-hyped before. While there might be an opportunity here, you'd want to take a close look at the balance sheet strength. You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values). NasdaqGM:QSI Earnings and Revenue Growth January 9th 2026 This free interactive report on Quantum-Si's balance sheet strength is a great place to start, if you want to investigate the stock further. A Different Perspective While the broader market gained around 19% in the last year, Quantum-Si shareholders lost 53%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 13% over the last half decade. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Case in point: We've spotted 5 warning signs for Quantum-Si you should be aware of. Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will grow earnings. Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.