It is doubtless a positive to see that the Yunnan Energy New Material Co., Ltd. (SZSE:002812) share price has gained some 53% in the last three months. But only the myopic could ignore the astounding decline over three years. To wit, the share price sky-dived 85% in that time. So it sure is nice to see a bit of an improvement. But the more important question is whether the underlying business can justify a higher price still. We really feel for shareholders in this scenario. It's a good reminder of the importance of diversification, and it's worth keeping in mind there's more to life than money, anyway.

Although the past week has been more reassuring for shareholders, they're still in the red over the last three years, so let's see if the underlying business has been responsible for the decline.

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

During the three years that the share price fell, Yunnan Energy New Material's earnings per share (EPS) dropped by 30% each year. This reduction in EPS is slower than the 47% annual reduction in the share price. So it's likely that the EPS decline has disappointed the market, leaving investors hesitant to buy.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

Dive deeper into Yunnan Energy New Material's key metrics by checking this interactive graph of Yunnan Energy New Material's earnings, revenue and cash flow.

A Different Perspective

While the broader market gained around 7.6% in the last year, Yunnan Energy New Material shareholders lost 33%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 0.2% per year over five years. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Even so, be aware that Yunnan Energy New Material is showing 2 warning signs in our investment analysis , and 1 of those is a bit concerning...

But note: Yunnan Energy New Material may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on Chinese exchanges.

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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.