Ningbo Lian Technology Co.,Ltd (SZSE:300784) shares have had a really impressive month, gaining 41% after a shaky period beforehand. 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.

Following the firm bounce in price, given close to half the companies in China have price-to-earnings ratios (or "P/E's") below 33x, you may consider Ningbo Lian TechnologyLtd as a stock to avoid entirely with its 50.9x P/E ratio. 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.

For example, consider that Ningbo Lian TechnologyLtd's financial performance has been poor lately as its earnings have been in decline. One possibility is that the P/E is high because investors think the company will still do enough to outperform the broader market in the near future. If not, then existing shareholders may be quite nervous about the viability of the share price.

Does Growth Match The High P/E?

In order to justify its P/E ratio, Ningbo Lian TechnologyLtd would need to produce outstanding growth well in excess of the market.

Taking a look back first, the company's earnings per share growth last year wasn't something to get excited about as it posted a disappointing decline of 13%. As a result, earnings from three years ago have also fallen 20% overall. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

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 Ningbo Lian TechnologyLtd 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. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the recent negative growth rates.

The Key Takeaway

Ningbo Lian TechnologyLtd's P/E is flying high just like its stock has during the last month. 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 Ningbo Lian TechnologyLtd 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 3 warning signs for Ningbo Lian TechnologyLtd (1 makes us a bit uncomfortable) you should be aware of.

Of course, you might also be able to find a better stock than Ningbo Lian TechnologyLtd. 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.