One simple way to benefit from the stock market is to buy an index fund. But if you buy good businesses at attractive prices, your portfolio returns could exceed the average market return. Just take a look at Tianneng Power International Limited (HKG:819), which is up 46%, over three years, soundly beating the market decline of 7.6% (not including dividends).

While this past week has detracted from the company's three-year return, let's look at the recent trends of the underlying business and see if the gains have been in alignment.

View our latest analysis for Tianneng Power International

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).

Tianneng Power International was able to grow its EPS at 3.3% per year over three years, sending the share price higher. This EPS growth is lower than the 13% average annual increase in the share price. So it's fair to assume the market has a higher opinion of the business than it did three years ago. It's not unusual to see the market 're-rate' a stock, after a few years of growth.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

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. It might be well worthwhile taking a look at our free report on Tianneng Power International's earnings, revenue and cash flow.

What About Dividends?

It is important to consider the total shareholder return, as well as the share price return, for any given stock. The TSR incorporates the value of any spin-offs or discounted capital raisings, along with any dividends, based on the assumption that the dividends are reinvested. So for companies that pay a generous dividend, the TSR is often a lot higher than the share price return. In the case of Tianneng Power International, it has a TSR of 66% for the last 3 years. That exceeds its share price return that we previously mentioned. And there's no prize for guessing that the dividend payments largely explain the divergence!

A Different Perspective

While it's certainly disappointing to see that Tianneng Power International shares lost 12% throughout the year, that wasn't as bad as the market loss of 17%. Longer term investors wouldn't be so upset, since they would have made 10%, each year, over five years. In the best case scenario the last year is just a temporary blip on the journey to a brighter future. 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. Consider risks, for instance. Every company has them, and we've spotted 2 warning signs for Tianneng Power International you should know about.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will grow earnings.

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