In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But the risk of stock picking is that you will likely buy under-performing companies. Unfortunately, that's been the case for longer term AVIC Airborne Systems Co., Ltd. (SHSE:600372) shareholders, since the share price is down 42% in the last three years, falling well short of the market decline of around 21%. The more recent news is of little comfort, with the share price down 24% in a year. Furthermore, it's down 13% in about a quarter. That's not much fun for holders. But this could be related to the weak market, which is down 39% in the same period.

Since AVIC Airborne Systems has shed CN¥3.4b from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

View our latest analysis for AVIC Airborne Systems

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just 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.

During the three years that the share price fell, AVIC Airborne Systems' earnings per share (EPS) dropped by 9.1% each year. This reduction in EPS is slower than the 17% annual reduction in the share price. So it seems the market was too confident about the business, in the past.

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

It's probably worth noting that the CEO is paid less than the median at similar sized companies. But while CEO remuneration is always worth checking, the really important question is whether the company can grow earnings going forward. Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here..

A Different Perspective

We regret to report that AVIC Airborne Systems shareholders are down 24% 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. 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. To that end, you should learn about the 3 warning signs we've spotted with AVIC Airborne Systems (including 1 which doesn't sit too well with us) .

If you are like me, then you will not want to miss this free list of growing companies that insiders are 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.