To the annoyance of some shareholders, Guangdong Green Precision Components Co., Ltd (SZSE:300968) shares are down a considerable 28% in the last month, which continues a horrid run for the company. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 25% share price drop.

In spite of the heavy fall in price, Guangdong Green Precision Components' price-to-earnings (or "P/E") ratio of 43.1x might still make it look like a sell right now compared to the market in China, where around half of the companies have P/E ratios below 29x and even P/E's below 18x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the elevated P/E.

For instance, Guangdong Green Precision Components' receding earnings in recent times would have to be some food for thought. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

In order to justify its P/E ratio, Guangdong Green Precision Components would need to produce impressive growth in excess of the market.

Retrospectively, the last year delivered a frustrating 47% decrease to the company's bottom line. As a result, earnings from three years ago have also fallen 65% overall. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Comparing that to the market, which is predicted to deliver 36% growth in the next 12 months, the company's downward momentum based on recent medium-term earnings results is a sobering picture.

With this information, we find it concerning that Guangdong Green Precision Components is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the recent negative growth rates.

The Key Takeaway

Despite the recent share price weakness, Guangdong Green Precision Components' P/E remains higher than most other companies. 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.

We've established that Guangdong Green Precision Components currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

It is also worth noting that we have found 3 warning signs for Guangdong Green Precision Components (2 can't be ignored!) that you need to take into consideration.

Of course, you might also be able to find a better stock than Guangdong Green Precision Components. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.