Zhongjin Irradiation Incorporated Company (SZSE:300962) shareholders have had their patience rewarded with a 26% share price jump in the last month. Unfortunately, despite the strong performance over the last month, the full year gain of 4.8% isn't as attractive.

Following the firm bounce in price, Zhongjin Irradiation's price-to-earnings (or "P/E") ratio of 41.5x 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 27x and even P/E's below 17x 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.

It looks like earnings growth has deserted Zhongjin Irradiation recently, which is not something to boast about. It might be that many are expecting an improvement to the uninspiring earnings performance over the coming period, which has kept the P/E from collapsing. If not, then existing shareholders may 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 far outperform the market for P/E ratios like Zhongjin Irradiation's to be considered reasonable.

Taking a look back first, we see that there was hardly any earnings per share growth to speak of for the company over the past year. Regardless, EPS has managed to lift by a handy 9.1% in aggregate from three years ago, thanks to the earlier period of growth. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

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 Zhongjin Irradiation's P/E sits above the majority of other companies. 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 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.

What We Can Learn From Zhongjin Irradiation's P/E?

Zhongjin Irradiation's P/E is flying high just like its stock has during the last month. 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.

Our examination of Zhongjin Irradiation 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. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely 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.

Plus, you should also learn about these 2 warning signs we've spotted with Zhongjin Irradiation.

If you're unsure about the strength of Zhongjin Irradiation'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.