Wells Advanced Materials (Shanghai) Co., Ltd. (SZSE:301555) shareholders won't be pleased to see that the share price has had a very rough month, dropping 28% and undoing the prior period's positive performance. Longer-term shareholders will rue the drop in the share price, since it's now virtually flat for the year after a promising few quarters.

Although its price has dipped substantially, given close to half the companies in China have price-to-earnings ratios (or "P/E's") below 30x, you may still consider Wells Advanced Materials (Shanghai) as a stock to avoid entirely with its 63.2x P/E ratio. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

For example, consider that Wells Advanced Materials (Shanghai)'s financial performance has been poor lately as its earnings have been in decline. 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 Wells Advanced Materials (Shanghai)'s Growth Trending?

In order to justify its P/E ratio, Wells Advanced Materials (Shanghai) would need to produce outstanding growth well in excess of the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 48%. The last three years don't look nice either as the company has shrunk EPS by 47% in aggregate. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 38% shows it's an unpleasant look.

With this information, we find it concerning that Wells Advanced Materials (Shanghai) is trading at a P/E higher than the market. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the recent negative growth rates.

The Bottom Line On Wells Advanced Materials (Shanghai)'s P/E

Wells Advanced Materials (Shanghai)'s shares may have retreated, but its P/E is still flying high. While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

We've established that Wells Advanced Materials (Shanghai) currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the high P/E lower. 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.

There are also other vital risk factors to consider and we've discovered 3 warning signs for Wells Advanced Materials (Shanghai) (2 shouldn't be ignored!) that you should be aware of before investing here.

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.