RoadMainT Co.,Ltd. (SHSE:603860) shareholders have had their patience rewarded with a 36% share price jump in the last month. Looking back a bit further, it's encouraging to see the stock is up 33% in the last year.

After such a large jump in price, given close to half the companies in China have price-to-earnings ratios (or "P/E's") below 33x, you may consider RoadMainTLtd as a stock to avoid entirely with its 54.4x 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.

It looks like earnings growth has deserted RoadMainTLtd recently, which is not something to boast about. It might be that many are expecting an improvement to the uninspiring earnings performance over the coming period, which has kept the P/E from collapsing. If not, then existing shareholders may be a little nervous about the viability of the share price.

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

RoadMainTLtd'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.

If we review the last year of earnings, the company posted a result that saw barely any deviation from a year ago. Regardless, EPS has managed to lift by a handy 12% in aggregate from three years ago, thanks to the earlier period of growth. Therefore, it's fair to say that earnings growth has been inconsistent recently for the company.

Weighing that recent medium-term earnings trajectory against the broader market's one-year forecast for expansion of 37% shows it's noticeably less attractive on an annualised basis.

With this information, we find it concerning that RoadMainTLtd is trading at a P/E higher than the market. 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. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Final Word

Shares in RoadMainTLtd have built up some good momentum lately, which has really inflated its P/E. It's argued the price-to-earnings ratio is an inferior measure of value within certain industries, but it can be a powerful business sentiment indicator.

Our examination of RoadMainTLtd 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. Right now we are increasingly uncomfortable with the high P/E as this earnings performance isn't likely 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.

A lot of potential risks can sit within a company's balance sheet. You can assess many of the main risks through our free balance sheet analysis for RoadMainTLtd with six simple checks.

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.