Guangdong Green Precision Components Co., Ltd (SZSE:300968) shareholders that were waiting for something to happen have been dealt a blow with a 29% share price drop in the last month. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 16% share price drop.

Even after such a large drop in price, Guangdong Green Precision Components' price-to-earnings (or "P/E") ratio of 48.7x might still make it look like a strong sell right now compared to the market in China, where around half of the companies have P/E ratios below 27x and even P/E's below 17x are quite common. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

For example, consider that Guangdong Green Precision Components' financial performance has been poor lately as its earnings have been in decline. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/E from collapsing. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

How Is Guangdong Green Precision Components' Growth Trending?

Guangdong Green Precision Components' P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 47% decrease to the company's bottom line. This means it has also seen a slide in earnings over the longer-term as EPS is down 65% in total over the last three years. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

In contrast to the company, the rest of the market is expected to grow by 41% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

With this information, we find it concerning that Guangdong Green Precision Components is trading at a P/E higher than the market. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. 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.

What We Can Learn From Guangdong Green Precision Components' P/E?

Guangdong Green Precision Components' shares may have retreated, but its P/E is still flying high. Generally, our preference is to limit the use of the price-to-earnings ratio to establishing what the market thinks about the overall health of a company.

Our examination of Guangdong Green Precision Components revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the high P/E lower. 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.

You should always think about risks. Case in point, we've spotted 3 warning signs for Guangdong Green Precision Components you should be aware of, and 2 of them shouldn't be ignored.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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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.