The main aim of stock picking is to find the market-beating stocks. But even the best stock picker will only win with some selections. At this point some shareholders may be questioning their investment in Sinopec Oilfield Service Corporation (HKG:1033), since the last five years saw the share price fall 40%. But it's up 6.1% in the last week.

While the last five years has been tough for Sinopec Oilfield Service shareholders, this past week has shown signs of promise. So let's look at the longer term fundamentals and see if they've been the driver of the negative returns.

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. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During the unfortunate half decade during which the share price slipped, Sinopec Oilfield Service actually saw its earnings per share (EPS) improve by 16% per year. So it doesn't seem like EPS is a great guide to understanding how the market is valuing the stock. Or possibly, the market was previously very optimistic, so the stock has disappointed, despite improving EPS.

Because of the sharp contrast between the EPS growth rate and the share price growth, we're inclined to look to other metrics to understand the changing market sentiment around the stock.

Revenue is actually up 4.0% over the time period. A more detailed examination of the revenue and earnings may or may not explain why the share price languishes; there could be an opportunity.

The graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

We know that Sinopec Oilfield Service has improved its bottom line lately, but what does the future have in store? This free report showing analyst forecasts should help you form a view on Sinopec Oilfield Service

A Different Perspective

While the broader market gained around 0.3% in the last year, Sinopec Oilfield Service shareholders lost 12%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. 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. It's always interesting to track share price performance over the longer term. But to understand Sinopec Oilfield Service better, we need to consider many other factors. Even so, be aware that Sinopec Oilfield Service is showing 2 warning signs in our investment analysis , and 1 of those doesn't sit too well with us...

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: many of them are unnoticed AND have attractive valuation).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on Hong Kong 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.

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