The most you can lose on any stock (assuming you don't use leverage) is 100% of your money. But on a lighter note, a good company can see its share price rise well over 100%. Long term CDW Corporation (NASDAQ:CDW) shareholders would be well aware of this, since the stock is up 153% in five years. Also pleasing for shareholders was the 16% gain in the last three months. But this could be related to the strong market, which is up 11% in the last three months.

With that in mind, it's worth seeing if the company's underlying fundamentals have been the driver of long term performance, or if there are some discrepancies.

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 flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

Over half a decade, CDW managed to grow its earnings per share at 14% a year. This EPS growth is lower than the 20% average annual increase in the share price. This suggests that market participants hold the company in higher regard, these days. That's not necessarily surprising considering the five-year track record of earnings growth.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

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. It might be well worthwhile taking a look at our free report on CDW's earnings, revenue and cash flow.

What About Dividends?

As well as measuring the share price return, investors should also consider the total shareholder return (TSR). Whereas the share price return only reflects the change in the share price, the TSR includes the value of dividends (assuming they were reinvested) and the benefit of any discounted capital raising or spin-off. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. As it happens, CDW's TSR for the last 5 years was 168%, which exceeds the share price return mentioned earlier. This is largely a result of its dividend payments!

A Different Perspective

CDW shareholders have received returns of 32% over twelve months (even including dividends), which isn't far from the general market return. Most would be happy with a gain, and it helps that the year's return is actually better than the average return over five years, which was 22%. It is possible that management foresight will bring growth well into the future, even if the share price slows down. 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. Take risks, for example - CDW has 1 warning sign we think you should be aware of.

CDW is not the only stock that insiders are buying. For those who like to find winning investments this free list of growing companies with recent insider purchasing, could be just the ticket.

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.