By buying an index fund, you can roughly match the market return with ease. But if you buy good businesses at attractive prices, your portfolio returns could exceed the average market return. For example, the Guomai Technologies, Inc. (SZSE:002093) share price is up 25% in the last three years, clearly besting the market decline of around 20% (not including dividends).

While the stock has fallen 6.5% this week, it's worth focusing on the longer term and seeing if the stocks historical returns have been driven by the underlying fundamentals.

To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' 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.

Guomai Technologies was able to grow its EPS at 49% per year over three years, sending the share price higher. This EPS growth is higher than the 8% average annual increase in the share price. So it seems investors have become more cautious about the company, over time.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here.

A Different Perspective

Guomai Technologies shareholders are down 11% for the year (even including dividends), but the market itself is up 4.1%. 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. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 0.1% over the last half decade. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. 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. Consider risks, for instance. Every company has them, and we've spotted 1 warning sign for Guomai Technologies you should know about.

We will like Guomai Technologies better if we see some big insider buys. While we wait, check out this free list of undervalued stocks (mostly small caps) with considerable, recent, insider buying.

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.