Those holding Lontium Semiconductor Corporation (SHSE:688486) shares would be relieved that the share price has rebounded 27% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. Unfortunately, despite the strong performance over the last month, the full year gain of 8.4% isn't as attractive.

Since its price has surged higher, Lontium Semiconductor may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 62.4x, since almost half of all companies in China have P/E ratios under 30x and even P/E's lower than 18x are not unusual. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

Recent times have been pleasing for Lontium Semiconductor as its earnings have risen in spite of the market's earnings going into reverse. It seems that many are expecting the company to continue defying the broader market adversity, which has increased investors' willingness to pay up for the stock. If not, then existing shareholders might be a little nervous about the viability of the share price.

How Is Lontium Semiconductor's Growth Trending?

Lontium Semiconductor's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered an exceptional 17% gain to the company's bottom line. Pleasingly, EPS has also lifted 118% in aggregate from three years ago, thanks to the last 12 months of growth. Therefore, it's fair to say the earnings growth recently has been superb for the company.

Turning to the outlook, the next year should generate growth of 29% as estimated by the three analysts watching the company. That's shaping up to be materially lower than the 41% growth forecast for the broader market.

With this information, we find it concerning that Lontium Semiconductor is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than analysts indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as this level of earnings growth is likely to weigh heavily on the share price eventually.

What We Can Learn From Lontium Semiconductor's P/E?

Lontium Semiconductor'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.

We've established that Lontium Semiconductor currently trades on a much higher than expected P/E since its forecast growth is lower than the wider market. Right now we are increasingly uncomfortable with the high P/E as the predicted future earnings aren't likely to support such positive sentiment for long. Unless these conditions improve markedly, it's very challenging to accept these prices as being reasonable.

Before you settle on your opinion, we've discovered 1 warning sign for Lontium Semiconductor that you should be aware of.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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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.