With a price-to-earnings (or "P/E") ratio of 12.6x Zhongshan Public Utilities Group Co.,Ltd (SZSE:000685) may be sending very bullish signals at the moment, given that almost half of all companies in China have P/E ratios greater than 32x and even P/E's higher than 59x are not unusual. However, the P/E might be quite low for a reason and it requires further investigation to determine if it's justified.

As an illustration, earnings have deteriorated at Zhongshan Public Utilities GroupLtd over the last year, which is not ideal at all. It might be that many expect the disappointing earnings performance to continue or accelerate, which has repressed the P/E. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

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

In order to justify its P/E ratio, Zhongshan Public Utilities GroupLtd would need to produce anemic growth that's substantially trailing the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 26%. As a result, earnings from three years ago have also fallen 41% 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 38% 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 understandable that Zhongshan Public Utilities GroupLtd's P/E would sit below the majority of other companies. Nonetheless, there's no guarantee the P/E has reached a floor yet with earnings going in reverse. Even just maintaining these prices could be difficult to achieve as recent earnings trends are already weighing down the shares.

The Final Word

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 Zhongshan Public Utilities GroupLtd maintains its low P/E on the weakness of its sliding earnings over the medium-term, as expected. Right now shareholders are accepting the low P/E as they concede future earnings probably won't provide any pleasant surprises. Unless the recent medium-term conditions improve, they will continue to form a barrier for the share price around these levels.

There are also other vital risk factors to consider before investing and we've discovered 2 warning signs for Zhongshan Public Utilities GroupLtd that you should be aware of.

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.