In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But its virtually certain that sometimes you will buy stocks that fall short of the market average returns. We regret to report that long term Dian Diagnostics Group Co.,Ltd. (SZSE:300244) shareholders have had that experience, with the share price dropping 42% in three years, versus a market decline of about 13%. And over the last year the share price fell 25%, so we doubt many shareholders are delighted. The falls have accelerated recently, with the share price down 23% in the last three months.

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.

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.

Dian Diagnostics GroupLtd saw its share price decline over the three years in which its EPS also dropped, falling to a loss. Extraordinary items contributed to this situation. Since the company has fallen to a loss making position, it's hard to compare the change in EPS with the share price change. However, we can say we'd expect to see a falling share price in this scenario.

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

Dive deeper into Dian Diagnostics GroupLtd's key metrics by checking this interactive graph of Dian Diagnostics GroupLtd's earnings, revenue and cash flow.

A Different Perspective

We regret to report that Dian Diagnostics GroupLtd shareholders are down 25% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 11%. Having said that, it's inevitable that some stocks will be oversold in a falling market. The key is to keep your eyes on the fundamental developments. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 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. It's always interesting to track share price performance over the longer term. But to understand Dian Diagnostics GroupLtd better, we need to consider many other factors. For example, we've discovered 1 warning sign for Dian Diagnostics GroupLtd that you should be aware of before investing here.

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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.