Shenglan Technology Co., Ltd. (SZSE:300843) shareholders won't be pleased to see that the share price has had a very rough month, dropping 28% and undoing the prior period's positive performance. Looking back over the past twelve months the stock has been a solid performer regardless, with a gain of 18%.

Even after such a large drop in price, Shenglan Technology's price-to-earnings (or "P/E") ratio of 45.6x 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. 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.

With earnings growth that's exceedingly strong of late, Shenglan Technology has been doing very well. The P/E is probably high because investors think this strong earnings growth will be enough to outperform the broader market in the near future. If not, then existing shareholders might be a little nervous about the viability of the share price.

Is There Enough Growth For Shenglan Technology?

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

Retrospectively, the last year delivered an exceptional 43% 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 37% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

Weighing that medium-term earnings trajectory against the broader market's one-year forecast for expansion of 37% shows it's an unpleasant look.

With this information, we find it concerning that Shenglan Technology is trading at a P/E higher than the market. It seems most investors are ignoring the recent poor growth rate 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 Bottom Line On Shenglan Technology's P/E

Shenglan Technology's shares may have retreated, but its P/E is still flying high. Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

Our examination of Shenglan Technology revealed its shrinking earnings over the medium-term aren't impacting its high P/E anywhere near as much as we would have predicted, given the market is set to grow. When we see earnings heading backwards and underperforming the market forecasts, 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.

Don't forget that there may be other risks. For instance, we've identified 2 warning signs for Shenglan Technology that you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.