The Shenzhen Sine Electric Co.,Ltd. (SHSE:688395) share price has done very well over the last month, posting an excellent gain of 37%. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 26% over that time.

Following the firm bounce in price, Shenzhen Sine ElectricLtd may be sending bearish signals at the moment with its price-to-earnings (or "P/E") ratio of 38.3x, since almost half of all companies in China have P/E ratios under 33x and even P/E's lower than 20x 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 as high as it is.

For instance, Shenzhen Sine ElectricLtd's receding earnings in recent times would have to be some food for thought. 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 Shenzhen Sine ElectricLtd's Growth Trending?

Shenzhen Sine ElectricLtd's P/E ratio would be typical for a company that's expected to deliver solid growth, and importantly, perform better than the market.

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 21%. The last three years don't look nice either as the company has shrunk EPS by 59% in aggregate. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

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.

In light of this, it's alarming that Shenzhen Sine ElectricLtd's P/E sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Key Takeaway

The large bounce in Shenzhen Sine ElectricLtd's shares has lifted the company's P/E to a fairly high level. 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 Shenzhen Sine ElectricLtd 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 3 warning signs for Shenzhen Sine ElectricLtd (1 can't be ignored!) that you need to take into consideration.

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.