It's not a stretch to say that Shenzhen Jufei Optoelectronics Co., Ltd.'s (SZSE:300303) price-to-earnings (or "P/E") ratio of 29.6x right now seems quite "middle-of-the-road" compared to the market in China, where the median P/E ratio is around 30x. 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.

For instance, Shenzhen Jufei Optoelectronics' receding earnings in recent times would have to be some food for thought. It might be that many expect the company to put the disappointing earnings performance behind them over the coming period, which has kept the P/E from falling. If you like the company, you'd at least be hoping this is the case so that you could potentially pick up some stock while it's not quite in favour.

See our latest analysis for Shenzhen Jufei Optoelectronics

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like Shenzhen Jufei Optoelectronics' to be considered reasonable.

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 11%. As a result, earnings from three years ago have also fallen 30% 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 42% 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 somewhat alarming that Shenzhen Jufei Optoelectronics' P/E sits in line with the majority of other companies. Apparently many investors in the company are way less bearish than recent times would indicate and aren't willing to let go of their stock right now. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh on the share price eventually.

The Key Takeaway

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 Shenzhen Jufei Optoelectronics currently trades on a higher than expected P/E since its recent earnings have been in decline over the medium-term. Right now we are uncomfortable with the P/E as this earnings performance is unlikely to support a more positive sentiment for long. Unless the recent medium-term conditions improve, it's challenging to accept these prices as being reasonable.

There are also other vital risk factors to consider before investing and we've discovered 1 warning sign for Shenzhen Jufei Optoelectronics that you should be aware of.

Of course, you might also be able to find a better stock than Shenzhen Jufei Optoelectronics. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.