Shenzhen JT Automation Equipment Co.,Ltd (SZSE:300400) shareholders that were waiting for something to happen have been dealt a blow with a 28% share price drop in the last month. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 48% share price drop.

Even after such a large drop in price, Shenzhen JT Automation EquipmentLtd's price-to-earnings (or "P/E") ratio of 38.9x might still make it look like a sell right now compared to the market in China, where around half of the companies have P/E ratios below 29x and even P/E's below 18x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the elevated P/E.

Shenzhen JT Automation EquipmentLtd certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. It seems that many are expecting the strong earnings performance to beat most other companies over the coming period, which has increased investors' willingness to pay up for the stock. If not, then existing shareholders might be a little nervous about the viability of the share price.

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

There's an inherent assumption that a company should outperform the market for P/E ratios like Shenzhen JT Automation EquipmentLtd's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 30%. Despite this strong recent growth, it's still struggling to catch up as its three-year EPS frustratingly shrank by 53% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

In contrast to the company, the rest of the market is expected to grow by 36% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

With this information, we find it concerning that Shenzhen JT Automation EquipmentLtd 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 Bottom Line On Shenzhen JT Automation EquipmentLtd's P/E

There's still some solid strength behind Shenzhen JT Automation EquipmentLtd's P/E, if not its share price lately. 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.

Our examination of Shenzhen JT Automation EquipmentLtd 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. 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.

And what about other risks? Every company has them, and we've spotted 2 warning signs for Shenzhen JT Automation EquipmentLtd you should know about.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and 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.