Dalian Insulator Group Co., Ltd (SZSE:002606) shareholders that were waiting for something to happen have been dealt a blow with a 27% 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 44% in that time.

Even after such a large drop in price, Dalian Insulator Group's price-to-earnings (or "P/E") ratio of 51x might still 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 26x and even P/E's below 16x are quite common. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

For instance, Dalian Insulator Group's receding earnings in recent times would have to be some food for thought. 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.

Does Growth Match The High P/E?

In order to justify its P/E ratio, Dalian Insulator Group 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 72%. As a result, earnings from three years ago have also fallen 54% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

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 Dalian Insulator Group 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. 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 Final Word

Even after such a strong price drop, Dalian Insulator Group's P/E still exceeds the rest of the market significantly. Generally, our preference is to limit the use of the price-to-earnings ratio to establishing what the market thinks about the overall health of a company.

We've established that Dalian Insulator Group currently trades on a much higher than expected P/E since its recent earnings have been in decline over the medium-term. 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. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

You always need to take note of risks, for example - Dalian Insulator Group has 2 warning signs we think you should be aware of.

If you're unsure about the strength of Dalian Insulator Group's business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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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.