China Energy Engineering Corporation Limited (HKG:3996) shares have had a really impressive month, gaining 29% after a shaky period beforehand. Taking a wider view, although not as strong as the last month, the full year gain of 19% is also fairly reasonable.

Even after such a large jump in price, given about half the companies in Hong Kong have price-to-earnings ratios (or "P/E's") above 10x, you may still consider China Energy Engineering as a highly attractive investment with its 4.9x P/E ratio. However, the P/E might be quite low for a reason and it requires further investigation to determine if it's justified.

We'd have to say that with no tangible growth over the last year, China Energy Engineering's earnings have been unimpressive. One possibility is that the P/E is low because investors think this benign earnings growth rate will likely underperform the broader market in the near future. If not, then existing shareholders may be feeling optimistic about the future direction of the share price.

Does Growth Match The Low P/E?

In order to justify its P/E ratio, China Energy Engineering would need to produce anemic growth that's substantially trailing the market.

Retrospectively, the last year delivered virtually the same number to the company's bottom line as the year before. The lack of growth did nothing to help the company's aggregate three-year performance, which is an unsavory 1.4% drop in EPS. 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 22% 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 China Energy Engineering'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

Shares in China Energy Engineering are going to need a lot more upward momentum to get the company's P/E out of its slump. 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.

As we suspected, our examination of China Energy Engineering revealed its shrinking earnings over the medium-term are contributing to its low P/E, given the market is set to grow. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. Unless the recent medium-term conditions improve, they will continue to form a barrier for the share price around these levels.

Plus, you should also learn about this 1 warning sign we've spotted with China Energy Engineering.

You might be able to find a better investment than China Energy Engineering. 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.