The Pentamaster International Limited (HKG:1665) share price has done very well over the last month, posting an excellent gain of 27%. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 14% in the last twelve months.

In spite of the firm bounce in price, it's still not a stretch to say that Pentamaster International's price-to-earnings (or "P/E") ratio of 8.9x right now seems quite "middle-of-the-road" compared to the market in Hong Kong, where the median P/E ratio is around 10x. Although, it's not wise to simply ignore the P/E without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

Pentamaster International hasn't been tracking well recently as its declining earnings compare poorly to other companies, which have seen some growth on average. It might be that many expect the dour earnings performance to strengthen positively, which has kept the P/E from falling. You'd really hope so, otherwise you're paying a relatively elevated price for a company with this sort of growth profile.

How Is Pentamaster International's Growth Trending?

The only time you'd be comfortable seeing a P/E like Pentamaster International's is when the company's growth is tracking the market closely.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 15%. Unfortunately, that's brought it right back to where it started three years ago with EPS growth being virtually non-existent overall during that time. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Looking ahead now, EPS is anticipated to climb by 12% during the coming year according to the two analysts following the company. With the market predicted to deliver 23% growth , the company is positioned for a weaker earnings result.

With this information, we find it interesting that Pentamaster International is trading at a fairly similar P/E to the market. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. These shareholders may be setting themselves up for future disappointment if the P/E falls to levels more in line with the growth outlook.

What We Can Learn From Pentamaster International's P/E?

Its shares have lifted substantially and now Pentamaster International's P/E is also back up to the market median. Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

Our examination of Pentamaster International's analyst forecasts revealed that its inferior earnings outlook isn't impacting its P/E as much as we would have predicted. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

There are also other vital risk factors to consider before investing and we've discovered 1 warning sign for Pentamaster International that you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.