Axcelis Technologies, Inc. (NASDAQ:ACLS) shareholders might be concerned after seeing the share price drop 24% in the last quarter. But over five years returns have been remarkably great. In that time, the share price has soared some 427% higher! So it might be that some shareholders are taking profits after good performance. Of course what matters most is whether the business can improve itself sustainably, thus justifying a higher price. While the long term returns are impressive, we do have some sympathy for those who bought more recently, given the 45% drop, in the last year.

While the stock has fallen 11% this week, it's worth focusing on the longer term and seeing if the stocks historical returns have been driven by the underlying fundamentals.

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 way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During five years of share price growth, Axcelis Technologies achieved compound earnings per share (EPS) growth of 58% per year. The EPS growth is more impressive than the yearly share price gain of 39% over the same period. Therefore, it seems the market has become relatively pessimistic about the company.

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 Axcelis Technologies' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Axcelis Technologies shareholders are down 45% for the year, but the market itself is up 21%. 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. On the bright side, long term shareholders have made money, with a gain of 39% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. 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. For example, we've discovered 2 warning signs for Axcelis Technologies (1 is a bit concerning!) that you should be aware of before investing here.

Axcelis Technologies 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.