With a price-to-earnings (or "P/E") ratio of 6.1x BOC Aviation Limited (HKG:2588) may be sending bullish signals at the moment, given that almost half of all companies in Hong Kong have P/E ratios greater than 9x and even P/E's higher 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 limited.

Recent times have been advantageous for BOC Aviation as its earnings have been rising faster than most other companies. One possibility is that the P/E is low because investors think this strong earnings performance might be less impressive moving forward. 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.

Does Growth Match The Low P/E?

The only time you'd be truly comfortable seeing a P/E as low as BOC Aviation's is when the company's growth is on track to lag the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 62% last year. Pleasingly, EPS has also lifted 118% in aggregate from three years ago, thanks to the last 12 months of growth. So we can start by confirming that the company has done a great job of growing earnings over that time.

Looking ahead now, EPS is anticipated to slump, contracting by 5.0% per annum during the coming three years according to the analysts following the company. That's not great when the rest of the market is expected to grow by 12% each year.

In light of this, it's understandable that BOC Aviation'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 the weak outlook is weighing down the shares.

What We Can Learn From BOC Aviation's 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.

As we suspected, our examination of BOC Aviation's analyst forecasts revealed that its outlook for shrinking earnings is contributing to its low P/E. Right now shareholders are accepting the low P/E as they concede future earnings probably won't provide any pleasant surprises. It's hard to see the share price rising strongly in the near future under these circumstances.

And what about other risks? Every company has them, and we've spotted 4 warning signs for BOC Aviation (of which 2 are significant!) you should know about.

If these risks are making you reconsider your opinion on BOC Aviation, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.