Despite an already strong run, Wuxi Smart Auto-Control Engineering Co., Ltd. (SZSE:002877) shares have been powering on, with a gain of 32% in the last thirty days. While recent buyers may be laughing, long-term holders might not be as pleased since the recent gain only brings the stock back to where it started a year ago.

Since its price has surged higher, Wuxi Smart Auto-Control Engineering may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 59.4x, since almost half of all companies in China have P/E ratios under 35x and even P/E's lower than 20x are not unusual. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

For instance, Wuxi Smart Auto-Control Engineering's receding earnings in recent times would have to be some food for thought. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Is There Enough Growth For Wuxi Smart Auto-Control Engineering?

Wuxi Smart Auto-Control Engineering's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 49% decrease to the company's bottom line. As a result, earnings from three years ago have also fallen 7.5% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 39% shows it's an unpleasant look.

With this information, we find it concerning that Wuxi Smart Auto-Control Engineering 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. 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.

What We Can Learn From Wuxi Smart Auto-Control Engineering's P/E?

Shares in Wuxi Smart Auto-Control Engineering have built up some good momentum lately, which has really inflated its P/E. 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 Wuxi Smart Auto-Control Engineering 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.

Don't forget that there may be other risks. For instance, we've identified 2 warning signs for Wuxi Smart Auto-Control Engineering (1 is a bit unpleasant) you should be aware of.

You might be able to find a better investment than Wuxi Smart Auto-Control Engineering. 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.