Guangzhou Jet Bio-Filtration Co., Ltd. (SHSE:688026) shares have continued their recent momentum with a 46% 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.

Although its price has surged higher, you could still be forgiven for feeling indifferent about Guangzhou Jet Bio-Filtration's P/E ratio of 36.2x, since the median price-to-earnings (or "P/E") ratio in China is also close to 34x. Although, it's not wise to simply ignore the P/E without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

Recent times have been pleasing for Guangzhou Jet Bio-Filtration as its earnings have risen in spite of the market's earnings going into reverse. One possibility is that the P/E is moderate because investors think the company's earnings will be less resilient moving forward. If not, then existing shareholders have reason to be feeling optimistic about the future direction of the share price.

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like Guangzhou Jet Bio-Filtration's to be considered reasonable.

Retrospectively, the last year delivered an exceptional 228% gain to the company's bottom line. Despite this strong recent growth, it's still struggling to catch up as its three-year EPS frustratingly shrank by 38% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

Looking ahead now, EPS is anticipated to climb by 15% each year during the coming three years according to the dual analysts following the company. With the market predicted to deliver 19% growth per year, the company is positioned for a weaker earnings result.

With this information, we find it interesting that Guangzhou Jet Bio-Filtration is trading at a fairly similar P/E to the market. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

The Bottom Line On Guangzhou Jet Bio-Filtration's P/E

Its shares have lifted substantially and now Guangzhou Jet Bio-Filtration's P/E is also back up to the market median. While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

Our examination of Guangzhou Jet Bio-Filtration's analyst forecasts revealed that its inferior earnings outlook isn't impacting its P/E as much as we would have predicted. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

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

Of course, you might also be able to find a better stock than Guangzhou Jet Bio-Filtration. 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.