Cec Environmental Protection Co.,Ltd (SZSE:300172) shares have had a really impressive month, gaining 37% after a shaky period beforehand. But the gains over the last month weren't enough to make shareholders whole, as the share price is still down 9.1% in the last twelve months.

Since its price has surged higher, Cec Environmental ProtectionLtd's price-to-earnings (or "P/E") ratio of 70.1x might 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 33x and even P/E's below 20x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

For example, consider that Cec Environmental ProtectionLtd's 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. If not, then existing shareholders may be quite nervous about the viability of the share price.

How Is Cec Environmental ProtectionLtd's Growth Trending?

In order to justify its P/E ratio, Cec Environmental ProtectionLtd would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered a frustrating 28% 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 37% 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 Cec Environmental ProtectionLtd 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.

The Final Word

The strong share price surge has got Cec Environmental ProtectionLtd's P/E rushing to great heights as well. 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 Cec Environmental ProtectionLtd 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. 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. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

It is also worth noting that we have found 1 warning sign for Cec Environmental ProtectionLtd that you need to take into consideration.

You might be able to find a better investment than Cec Environmental ProtectionLtd. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.