Shanghai Cooltech Power Co., Ltd. (SZSE:300153) shares have continued their recent momentum with a 27% gain in the last month alone. 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.

After such a large jump in price, Shanghai Cooltech Power may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 66.6x, since almost half of all companies in China have P/E ratios under 33x 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.

The recent earnings growth at Shanghai Cooltech Power would have to be considered satisfactory if not spectacular. One possibility is that the P/E is high because investors think this good earnings growth will be 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.

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

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

Retrospectively, the last year delivered a decent 3.2% gain to the company's bottom line. Although, the latest three year period in total hasn't been as good as it didn't manage to provide any growth at all. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

This is in contrast to the rest of the market, which is expected to grow by 36% over the next year, materially higher than the company's recent medium-term annualised growth rates.

In light of this, it's alarming that Shanghai Cooltech Power's P/E sits above the majority of other companies. It seems most investors are ignoring the fairly limited recent growth rates 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.

The Key Takeaway

Shanghai Cooltech Power's P/E is flying high just like its stock has during the last month. 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.

Our examination of Shanghai Cooltech Power revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. 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.

The company's balance sheet is another key area for risk analysis. Our free balance sheet analysis for Shanghai Cooltech Power with six simple checks will allow you to discover any risks that could be an issue.

If you're unsure about the strength of Shanghai Cooltech Power'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.