Ideally, your overall portfolio should beat the market average. But the main game is to find enough winners to more than offset the losers At this point some shareholders may be questioning their investment in Guangzhou Pearl River Piano Group Co.,Ltd (SZSE:002678), since the last five years saw the share price fall 44%. And it's not just long term holders hurting, because the stock is down 31% in the last year. On the other hand the share price has bounced 9.2% over the last week.

On a more encouraging note the company has added CN¥457m to its market cap in just the last 7 days, so let's see if we can determine what's driven the five-year loss for shareholders.

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. 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.

In the last half decade Guangzhou Pearl River Piano GroupLtd saw its share price fall as its EPS declined below zero. 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 image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

Dive deeper into Guangzhou Pearl River Piano GroupLtd's key metrics by checking this interactive graph of Guangzhou Pearl River Piano GroupLtd's earnings, revenue and cash flow.

A Different Perspective

While the broader market lost about 17% in the twelve months, Guangzhou Pearl River Piano GroupLtd shareholders did even worse, losing 30% (even including dividends). 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 7% 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. For instance, we've identified 1 warning sign for Guangzhou Pearl River Piano GroupLtd that you should be aware of.

But note: Guangzhou Pearl River Piano GroupLtd 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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.
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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team@simplywallst.com