Despite an already strong run, Shanghai Sinotec Co., Ltd. (SHSE:603121) shares have been powering on, with a gain of 27% in the last thirty days. Looking further back, the 23% rise over the last twelve months isn't too bad notwithstanding the strength over the last 30 days.

Following the firm bounce in price, Shanghai Sinotec's price-to-earnings (or "P/E") ratio of 41.5x 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 36x and even P/E's below 21x 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 Sinotec as its earnings have been rising very briskly. 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. 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?

The only time you'd be truly comfortable seeing a P/E as high as Shanghai Sinotec's is when the company's growth is on track to outshine the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 37% last year. EPS has also lifted 27% in aggregate from three years ago, mostly thanks to the last 12 months of growth. So we can start by confirming that the company has actually done a good job of growing earnings over that time.

Comparing that to the market, which is predicted to deliver 38% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

In light of this, it's alarming that Shanghai Sinotec'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 good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with recent growth rates.

The Final Word

The large bounce in Shanghai Sinotec's shares has lifted the company's P/E to a fairly high level. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

Our examination of Shanghai Sinotec revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. When we see weak earnings with slower than market growth, 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.

There are also other vital risk factors to consider before investing and we've discovered 1 warning sign for Shanghai Sinotec that you should be aware of.

You might be able to find a better investment than Shanghai Sinotec. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.