CNNC International Limited (HKG:2302) shareholders that were waiting for something to happen have been dealt a blow with a 26% share price drop in the last month. Still, a bad month hasn't completely ruined the past year with the stock gaining 71%, which is great even in a bull market.

Even after such a large drop in price, it's still not a stretch to say that CNNC International's price-to-earnings (or "P/E") ratio of 7.9x right now seems quite "middle-of-the-road" compared to the market in Hong Kong, where the median P/E ratio is around 9x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

CNNC International certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. The P/E is probably moderate because investors think this strong earnings growth might not be enough to outperform the broader market in the near future. If that doesn't eventuate, then existing shareholders have reason to be feeling optimistic about the future direction of the share price.

Does Growth Match The P/E?

The only time you'd be comfortable seeing a P/E like CNNC International's is when the company's growth is tracking the market closely.

If we review the last year of earnings growth, the company posted a terrific increase of 32%. However, the latest three year period hasn't been as great in aggregate as it didn't manage to provide any growth at all. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

This is in contrast to the rest of the market, which is expected to grow by 18% over the next year, materially higher than the company's recent medium-term annualised growth rates.

In light of this, it's curious that CNNC International's P/E sits in line with the majority of other companies. Apparently many investors in the company are less bearish than recent times would indicate and aren't willing to let go of their stock right now. Maintaining these prices will be difficult to achieve as a continuation of recent earnings trends is likely to weigh down the shares eventually.

The Key Takeaway

Following CNNC International's share price tumble, its P/E is now hanging on to the median market P/E. 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 CNNC International currently trades on a higher than expected P/E since its recent three-year growth is lower than the wider market forecast. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. Unless the recent medium-term conditions improve, it's challenging to accept these prices as being reasonable.

Many other vital risk factors can be found on the company's balance sheet. Take a look at our free balance sheet analysis for CNNC International with six simple checks on some of these key factors.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on 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.