The most you can lose on any stock (assuming you don't use leverage) is 100% of your money. But on the bright side, if you buy shares in a high quality company at the right price, you can gain well over 100%. For instance, the price of OSI Systems, Inc. (NASDAQ:OSIS) stock is up an impressive 181% over the last five years. Better yet, the share price has risen 7.2% in the last week. But this might be partly because the broader market had a good week last week, gaining 7.1%.

After a strong gain in the past week, it's worth seeing if longer term returns have been driven by improving fundamentals.

We've discovered 2 warning signs about OSI Systems. View them for free.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During five years of share price growth, OSI Systems achieved compound earnings per share (EPS) growth of 13% per year. This EPS growth is lower than the 23% average annual increase in the share price. This suggests that market participants hold the company in higher regard, these days. And that's hardly shocking given the track record of growth.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

We know that OSI Systems has improved its bottom line lately, but is it going to grow revenue? This free report showing analyst revenue forecasts should help you figure out if the EPS growth can be sustained.

A Different Perspective

It's good to see that OSI Systems has rewarded shareholders with a total shareholder return of 48% in the last twelve months. That's better than the annualised return of 23% over half a decade, implying that the company is doing better recently. In the best case scenario, this may hint at some real business momentum, implying that now could be a great time to delve deeper. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Like risks, for instance. Every company has them, and we've spotted 2 warning signs for OSI Systems (of which 1 is potentially serious!) you should know about.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can 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.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.