The Sanai Health Industry Group Company Limited (HKG:1889) share price has fared very poorly over the last month, falling by a substantial 28%. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 43% in that time.

After such a large drop in price, Sanai Health Industry Group may be sending very bullish signals at the moment with its price-to-earnings (or "P/E") ratio of 3.7x, since almost half of all companies in Hong Kong have P/E ratios greater than 9x and even P/E's higher than 18x are not unusual. However, the P/E might be quite low for a reason and it requires further investigation to determine if it's justified.

Sanai Health Industry Group certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. It might be that many expect the strong earnings performance to degrade substantially, which has repressed the P/E. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's out of favour.

Check out our latest analysis for Sanai Health Industry Group

How Is Sanai Health Industry Group's Growth Trending?

There's an inherent assumption that a company should far underperform the market for P/E ratios like Sanai Health Industry Group's to be considered reasonable.

Taking a look back first, we see that the company grew earnings per share by an impressive 232% last year. Although, its longer-term performance hasn't been as strong with three-year EPS growth being relatively non-existent overall. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 22% shows it's noticeably less attractive on an annualised basis.

In light of this, it's understandable that Sanai Health Industry Group's P/E sits below the majority of other companies. It seems most investors are expecting to see the recent limited growth rates continue into the future and are only willing to pay a reduced amount for the stock.

What We Can Learn From Sanai Health Industry Group's P/E?

Sanai Health Industry Group's P/E looks about as weak as its stock price lately. 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.

As we suspected, our examination of Sanai Health Industry Group revealed its three-year earnings trends are contributing to its low P/E, given they look worse than current market expectations. At this stage investors feel the potential for an improvement in earnings isn't great enough to justify a higher P/E ratio. If recent medium-term earnings trends continue, it's hard to see the share price rising strongly in the near future under these circumstances.

Plus, you should also learn about these 2 warning signs we've spotted with Sanai Health Industry Group.

Of course, you might also be able to find a better stock than Sanai Health Industry Group. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.