Some stocks are best avoided. It hits us in the gut when we see fellow investors suffer a loss. Imagine if you held Costain Group PLC (LON:COST) for half a decade as the share price tanked 91%. We really feel for shareholders in this scenario. It's a good reminder of the importance of diversification, and it's worth keeping in mind there's more to life than money, anyway.

So let's have a look and see if the longer term performance of the company has been in line with the underlying business' progress.

Check out our latest analysis for Costain Group

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. 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 five years Costain Group's earnings per share dropped significantly, falling to a loss, with the share price also lower. Since the company has fallen to a loss making position, it's hard to compare the change in EPS with the share price change. However, we can say we'd expect to see a falling share price in this scenario.

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

Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here.

A Different Perspective

Costain Group shareholders are down 12% for the year, but the market itself is up 2.1%. 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. Unfortunately, longer term shareholders are suffering worse, given the loss of 14% doled out over the last five years. We'd need to see some sustained improvements in the key metrics before we could muster much enthusiasm. Before spending more time on Costain Group it might be wise to click here to see if insiders have been buying or selling shares.



But note: Costain Group may not be the best stock to buy. So take a peek at this freelist of interesting companies with past earnings growth (and further growth forecast).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on GB exchanges.

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

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.

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