Extreme Networks, Inc. (NASDAQ:EXTR) shareholders might be concerned after seeing the share price drop 26% in the last month. On the bright side the share price is up over the last half decade. However we are not very impressed because the share price is only up 62%, less than the market return of 94%.

Since the stock has added US$107m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

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 the last half decade, Extreme Networks became profitable. That would generally be considered a positive, so we'd expect the share price to be up.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

It is of course excellent to see how Extreme Networks has grown profits over the years, but the future is more important for shareholders. It might be well worthwhile taking a look at our free report on how its financial position has changed over time.

A Different Perspective

Extreme Networks shareholders are down 31% for the year, but the market itself is up 28%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Longer term investors wouldn't be so upset, since they would have made 10%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. Most investors take the time to check the data on insider transactions. You can click here to see if insiders have been buying or selling.

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.

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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.