Sanyou Corporation Limited (SZSE:300932) shares have had a really impressive month, gaining 28% after a shaky period beforehand. Unfortunately, despite the strong performance over the last month, the full year gain of 7.9% isn't as attractive.

Following the firm bounce in price, Sanyou may be sending very bearish signals at the moment with a price-to-earnings (or "P/E") ratio of 47x, since almost half of all companies in China have P/E ratios under 29x and even P/E's lower than 18x are not unusual. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

For example, consider that Sanyou's financial performance has been pretty ordinary lately as earnings growth is non-existent. One possibility is that the P/E is high because investors think the benign earnings growth will improve to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Is There Enough Growth For Sanyou?

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

Taking a look back first, we see that there was hardly any earnings per share growth to speak of for the company over the past year. Whilst it's an improvement, it wasn't enough to get the company out of the hole it was in, with earnings down 66% overall from three years ago. Accordingly, shareholders would have felt downbeat about the medium-term rates of earnings growth.

In contrast to the company, the rest of the market is expected to grow by 36% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

In light of this, it's alarming that Sanyou's P/E sits above the majority of other companies. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. 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

Shares in Sanyou have built up some good momentum lately, which has really inflated its P/E. 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 Sanyou 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. Right now we are increasingly uncomfortable with the high P/E as this earnings performance is highly unlikely to support such positive sentiment for long. 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.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 4 warning signs with Sanyou (at least 2 which can't be ignored), and understanding them should be part of your investment process.

If these risks are making you reconsider your opinion on Sanyou, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.