Cec Environmental Protection Co.,Ltd (SZSE:300172) shareholders would be excited to see that the share price has had a great month, posting a 28% gain and recovering from prior weakness. The last 30 days bring the annual gain to a very sharp 31%.

After such a large jump in price, Cec Environmental ProtectionLtd may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 48.4x, since almost half of all companies in China have P/E ratios under 30x and even P/E's lower than 18x are not unusual. 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.

As an illustration, earnings have deteriorated at Cec Environmental ProtectionLtd over the last year, which is not ideal at all. 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. If not, then existing shareholders may be quite nervous about the viability of the share price.

Is There Enough Growth For Cec Environmental ProtectionLtd?

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 31% decrease to the company's bottom line. As a result, earnings from three years ago have also fallen 47% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Comparing that to the market, which is predicted to deliver 39% 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.

What We Can Learn From Cec Environmental ProtectionLtd's P/E?

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. 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 Cec Environmental ProtectionLtd (1 is a bit concerning!) that you need to take into consideration.

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.