For many investors, the main point of stock picking is to generate higher returns than the overall market. But in any portfolio, there are likely to be some stocks that fall short of that benchmark. Unfortunately, that's been the case for longer term COFCO Biotechnology Co., Ltd. (SZSE:000930) shareholders, since the share price is down 32% in the last three years, falling well short of the market decline of around 16%.

On a more encouraging note the company has added CN¥671m to its market cap in just the last 7 days, so let's see if we can determine what's driven the three-year loss for shareholders.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

COFCO Biotechnology saw its share price decline over the three years in which its EPS also dropped, falling to a loss. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

The graphic below depicts how EPS has changed over time (unveil the exact values by clicking on the image).

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

What About The Total Shareholder Return (TSR)?

We'd be remiss not to mention the difference between COFCO Biotechnology's total shareholder return (TSR) and its share price return. The TSR is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. COFCO Biotechnology's TSR of was a loss of 25% for the 3 years. That wasn't as bad as its share price return, because it has paid dividends.

A Different Perspective

While the broader market lost about 11% in the twelve months, COFCO Biotechnology shareholders did even worse, losing 16%. 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 1.6% per year over five years. 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. For example, we've discovered 1 warning sign for COFCO Biotechnology that you should be aware of before investing here.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can 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.