The Shanghai Lianming Machinery Co., Ltd. (SHSE:603006) share price has softened a substantial 37% over the previous 30 days, handing back much of the gains the stock has made lately. Looking at the bigger picture, even after this poor month the stock is up 26% in the last year.

Although its price has dipped substantially, it's still not a stretch to say that Shanghai Lianming Machinery's price-to-earnings (or "P/E") ratio of 33.6x right now seems quite "middle-of-the-road" compared to the market in China, where the median P/E ratio is around 32x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/E.

As an illustration, earnings have deteriorated at Shanghai Lianming Machinery over the last year, which is not ideal at all. It might be that many expect the company to put the disappointing earnings performance behind them over the coming period, which has kept the P/E from falling. 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 P/E?

Shanghai Lianming Machinery's P/E ratio would be typical for a company that's only expected to deliver moderate growth, and importantly, perform in line with the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 45%. As a result, earnings from three years ago have also fallen 38% overall. Therefore, it's fair to say the earnings growth recently has been undesirable for the company.

In contrast to the company, the rest of the market is expected to grow by 39% over the next year, which really puts the company's recent medium-term earnings decline into perspective.

In light of this, it's somewhat alarming that Shanghai Lianming Machinery's P/E sits in line with the majority of other companies. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh on the share price eventually.

What We Can Learn From Shanghai Lianming Machinery's P/E?

Following Shanghai Lianming Machinery's share price tumble, its P/E is now hanging on to the median market P/E. 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.

We've established that Shanghai Lianming Machinery currently trades on a higher than expected P/E since its recent earnings have been in decline over the medium-term. When we see earnings heading backwards and underperforming the market forecasts, we suspect the share price is at risk of declining, sending the moderate P/E lower. If recent medium-term earnings trends continue, it will place shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

There are also other vital risk factors to consider and we've discovered 4 warning signs for Shanghai Lianming Machinery (1 doesn't sit too well with us!) that you should be aware of before investing here.

Of course, you might also be able to find a better stock than Shanghai Lianming Machinery. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.