If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. Long term Align Technology, Inc. (NASDAQ:ALGN) shareholders know that all too well, since the share price is down considerably over three years. So they might be feeling emotional about the 67% share price collapse, in that time. And over the last year the share price fell 41%, so we doubt many shareholders are delighted. Shareholders have had an even rougher run lately, with the share price down 27% in the last 90 days. This could be related to the recent financial results - you can catch up on the most recent data by reading our company report.

If the past week is anything to go by, investor sentiment for Align Technology isn't positive, so let's see if there's a mismatch between fundamentals and the share price.

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).

Align Technology saw its EPS decline at a compound rate of 12% per year, over the last three years. The share price decline of 31% is actually steeper than the EPS slippage. So it's likely that the EPS decline has disappointed the market, leaving investors hesitant to buy.

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

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 Align Technology's earnings, revenue and cash flow.

A Different Perspective

Align Technology shareholders are down 41% for the year, but the market itself is up 20%. 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 2% 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. If you want to research this stock further, the data on insider buying is an obvious place to start. You can click here to see who has been buying shares - and the price they paid.

Align Technology is not the only stock that insiders are buying. For those who like to find lesser know companies 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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team@simplywallst.com