If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. But the long term shareholders of Tianneng Power International Limited (HKG:819) have had an unfortunate run in the last three years. Regrettably, they have had to cope with a 58% drop in the share price over that period. The more recent news is of little comfort, with the share price down 30% in a year. The last week also saw the share price slip down another 9.5%. This could be related to the recent financial results - you can catch up on the most recent data by reading our company report.

With the stock having lost 9.5% in the past week, it's worth taking a look at business performance and seeing if there's any red flags.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. 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.

During the three years that the share price fell, Tianneng Power International's earnings per share (EPS) dropped by 9.7% each year. The share price decline of 25% is actually steeper than the EPS slippage. So it seems the market was too confident about the business, in the past. This increased caution is also evident in the rather low P/E ratio, which is sitting at 3.76.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

We like that insiders have been buying shares in the last twelve months. Having said that, most people consider earnings and revenue growth trends to be a more meaningful guide to the business. Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here..

What About Dividends?

When looking at investment returns, it is important to consider the difference between total shareholder return (TSR) and share price return. 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. Arguably, the TSR gives a more comprehensive picture of the return generated by a stock. In the case of Tianneng Power International, it has a TSR of -52% for the last 3 years. That exceeds its share price return that we previously mentioned. The dividends paid by the company have thusly boosted the total shareholder return.

A Different Perspective

While the broader market lost about 9.6% in the twelve months, Tianneng Power International shareholders did even worse, losing 27% (even including dividends). 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. On the bright side, long term shareholders have made money, with a gain of 0.3% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. It's always interesting to track share price performance over the longer term. But to understand Tianneng Power International better, we need to consider many other factors. Case in point: We've spotted 1 warning sign for Tianneng Power International 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 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.