When we invest, we're generally looking for stocks that outperform the market average. Buying under-rated businesses is one path to excess returns. For example, long term Mercury NZ Limited (NZSE:MCY) shareholders have enjoyed a 23% share price rise over the last half decade, well in excess of the market decline of around 4.9% (not including dividends).

Let's take a look at the underlying fundamentals over the longer term, and see if they've been consistent with shareholders returns.

Our free stock report includes 2 warning signs investors should be aware of before investing in Mercury NZ. Read for free now.

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. 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 five years of share price growth, Mercury NZ actually saw its EPS drop 32% per year.

Since the EPS are down strongly, it seems highly unlikely market participants are looking at EPS to value the company. Given that EPS is down, but the share price is up, it seems clear the market is focussed on other aspects of the business, at the moment.

In fact, the dividend has increased over time, which is a positive. It could be that the company is reaching maturity and dividend investors are buying for the yield. We'd posit that the revenue growth over the last five years, of 16% per year, would encourage people to invest.

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

You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

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 is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. It's fair to say that the TSR gives a more complete picture for stocks that pay a dividend. In the case of Mercury NZ, it has a TSR of 50% for the last 5 years. That exceeds its share price return that we previously mentioned. This is largely a result of its dividend payments!

A Different Perspective

While the broader market gained around 4.7% in the last year, Mercury NZ shareholders lost 7.3% (even including dividends). However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 8%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. 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. Even so, be aware that Mercury NZ is showing 2 warning signs in our investment analysis , you should know about...

Of course Mercury NZ may not be the best stock to buy. So you may wish to see this free collection of growth stocks.

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