With a price-to-earnings (or "P/E") ratio of 54.2x Shanghai Join Buy Co.,Ltd. (SHSE:600838) may be sending very bearish signals at the moment, given that almost half of all companies in China have P/E ratios under 26x and even P/E's lower than 16x are not unusual. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

As an illustration, earnings have deteriorated at Shanghai Join BuyLtd over the last year, which is not ideal at all. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/E from collapsing. If not, then existing shareholders may be quite nervous about the viability of the share price.

How Is Shanghai Join BuyLtd's Growth Trending?

There's an inherent assumption that a company should far outperform the market for P/E ratios like Shanghai Join BuyLtd's to be considered reasonable.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 22%. The last three years don't look nice either as the company has shrunk EPS by 28% in aggregate. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 36% shows it's an unpleasant look.

In light of this, it's alarming that Shanghai Join BuyLtd's P/E sits above the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On Shanghai Join BuyLtd's P/E

Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

We've established that Shanghai Join BuyLtd currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

Before you take the next step, you should know about the 1 warning sign for Shanghai Join BuyLtd that we have uncovered.

You might be able to find a better investment than Shanghai Join BuyLtd. 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.