Shanghai Laimu Electronics Co.,Ltd. (SHSE:603633) shareholders would be excited to see that the share price has had a great month, posting a 25% gain and recovering from prior weakness. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 12% in the last twelve months.

After such a large jump in price, Shanghai Laimu ElectronicsLtd's price-to-earnings (or "P/E") ratio of 49.6x might make it look like a strong sell right now compared to the market in China, where around half of the companies have P/E ratios below 32x and even P/E's below 20x are quite common. 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 Laimu ElectronicsLtd over the last year, which is not ideal at all. 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.

How Is Shanghai Laimu ElectronicsLtd's Growth Trending?

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

Retrospectively, the last year delivered a frustrating 7.9% decrease to the company's bottom line. That put a dampener on the good run it was having over the longer-term as its three-year EPS growth is still a noteworthy 15% in total. Although it's been a bumpy ride, it's still fair to say the earnings growth recently has been mostly respectable for the company.

Comparing that to the market, which is predicted to deliver 38% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

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

The Final Word

Shares in Shanghai Laimu ElectronicsLtd have built up some good momentum lately, which has really inflated its P/E. It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

We've established that Shanghai Laimu ElectronicsLtd currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. When we see weak earnings with slower than market growth, 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.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 1 warning sign with Shanghai Laimu ElectronicsLtd, and understanding should be part of your investment process.

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.