Shanghai Prisemi Electronics Co.,Ltd. (SHSE:688230) shares have had a really impressive month, gaining 39% after a shaky period beforehand. Notwithstanding the latest gain, the annual share price return of 4.1% isn't as impressive.

After such a large jump in price, Shanghai Prisemi ElectronicsLtd's price-to-earnings (or "P/E") ratio of 46.1x might make it look like a sell right now compared to the market in China, where around half of the companies have P/E ratios below 34x and even P/E's below 20x are quite common. However, the P/E might be high for a reason and it requires further investigation to determine if it's justified.

Recent times have been quite advantageous for Shanghai Prisemi ElectronicsLtd as its earnings have been rising very briskly. It seems that many are expecting the strong earnings performance to beat most other companies over the coming period, which has increased investors' willingness to pay up for the stock. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

Shanghai Prisemi ElectronicsLtd's P/E ratio would be typical for a company that's expected to deliver solid growth, and importantly, perform better than the market.

Retrospectively, the last year delivered an exceptional 37% gain to the company's bottom line. However, this wasn't enough as the latest three year period has seen a very unpleasant 23% drop in EPS in aggregate. So unfortunately, we have to acknowledge that the company has not done a great job of growing earnings over that time.

In contrast to the company, the rest of the market is expected to grow by 38% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

With this information, we find it concerning that Shanghai Prisemi ElectronicsLtd 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

The large bounce in Shanghai Prisemi ElectronicsLtd's shares has lifted the company's P/E to a fairly high level. 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 Shanghai Prisemi ElectronicsLtd 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. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Plus, you should also learn about these 2 warning signs we've spotted with Shanghai Prisemi ElectronicsLtd.

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.