Sinomach General Machinery Science & Technology Co.,Ltd. (SHSE:600444) shareholders that were waiting for something to happen have been dealt a blow with a 28% share price drop in the last month. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 23% in that time.

Although its price has dipped substantially, Sinomach General Machinery Science & TechnologyLtd may still be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 61.7x, since 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.

For example, consider that Sinomach General Machinery Science & TechnologyLtd'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. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

In order to justify its P/E ratio, Sinomach General Machinery Science & TechnologyLtd would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered a frustrating 55% decrease to the company's bottom line. The last three years don't look nice either as the company has shrunk EPS by 57% in aggregate. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Comparing that to the market, which is predicted to deliver 41% growth in the next 12 months, the company's downward momentum based on recent medium-term earnings results is a sobering picture.

With this information, we find it concerning that Sinomach General Machinery Science & TechnologyLtd is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. 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 Final Word

Sinomach General Machinery Science & TechnologyLtd's shares may have retreated, but its P/E is still flying high. 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.

Our examination of Sinomach General Machinery Science & TechnologyLtd revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. 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. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Don't forget that there may be other risks. For instance, we've identified 5 warning signs for Sinomach General Machinery Science & TechnologyLtd (3 make us uncomfortable) you should be aware of.

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.