When we invest, we're generally looking for stocks that outperform the market average. And while active stock picking involves risks (and requires diversification) it can also provide excess returns. For example, long term ZYF Lopsking Aluminum Co., Ltd. (SZSE:002333) shareholders have enjoyed a 27% share price rise over the last half decade, well in excess of the market return of around 18% (not including dividends).

Since the stock has added CN¥486m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During the five years of share price growth, ZYF Lopsking Aluminum moved from a loss to profitability. That would generally be considered a positive, so we'd hope to see the share price to rise.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

This free interactive report on ZYF Lopsking Aluminum's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

ZYF Lopsking Aluminum shareholders are down 6.3% for the year (even including dividends), but the market itself is up 3.3%. 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. On the bright side, long term shareholders have made money, with a gain of 5% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. For example, we've discovered 2 warning signs for ZYF Lopsking Aluminum that you should be aware of before investing here.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will grow earnings.

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.