By buying an index fund, investors can approximate the average market return. But many of us dare to dream of bigger returns, and build a portfolio ourselves. For example, the North Electro-Optic Co.,Ltd. (SHSE:600184) share price is up 47% in the last three years, clearly besting the market return of around 23% (not including dividends).

Since the stock has added CN¥356m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

See our latest analysis for North Electro-OpticLtd

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. 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.

North Electro-OpticLtd was able to grow its EPS at 6.5% per year over three years, sending the share price higher. This EPS growth is lower than the 14% average annual increase in the share price. This indicates that the market is feeling more optimistic on the stock, after the last few years of progress. That's not necessarily surprising considering the three-year track record of earnings growth. This optimism is also reflected in the fairly generous P/E ratio of 101.37.

You can see below how EPS has changed over time (discover 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.

A Different Perspective

We regret to report that North Electro-OpticLtd shareholders are down 5.1% for the year (even including dividends). Unfortunately, that's worse than the broader market decline of 0.2%. However, it could simply be that the share price has been impacted by broader market jitters. It might be worth keeping an eye on the fundamentals, in case there's a good opportunity. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 4% over the last half decade. 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 North Electro-OpticLtd better, we need to consider many other factors. Case in point: We've spotted 1 warning sign for North Electro-OpticLtd you should be aware of.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: insiders have been buying them).

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.