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%. One great example is Waters Corporation (NYSE:WAT) which saw its share price drive 113% higher over five years. It's even up 4.1% in the last week.

Since the stock has added US$930m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

Check out our latest analysis for Waters

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.

Over half a decade, Waters managed to grow its earnings per share at 4.2% a year. This EPS growth is lower than the 16% average annual increase in the share price. So it's fair to assume the market has a higher opinion of the business than it did five years ago. And that's hardly shocking given the track record of growth.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

We consider it positive that insiders have made significant purchases in the last year. Even so, future earnings will be far more important to whether current shareholders make money. This free interactive report on Waters' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Waters shareholders gained a total return of 10% during the year. Unfortunately this falls short of the market return. On the bright side, the longer term returns (running at about 16% a year, over half a decade) look better. It may well be that this is a business worth popping on the watching, given the continuing positive reception, over time, from the market. 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. Consider risks, for instance. Every company has them, and we've spotted 1 warning sign for Waters you should know about.

Waters is not the only stock insiders are buying. So take a peek at this free list of small cap companies at attractive valuations which insiders have been buying.

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.