It might seem bad, but the worst that can happen when you buy a stock (without leverage) is that its share price goes to zero. But when you pick a company that is really flourishing, you can make more than 100%. To wit, the Kosmos Energy Ltd. (NYSE:KOS) share price has flown 132% in the last three years. Most would be happy with that. In more good news, the share price has risen 8.8% in thirty days.

Since the stock has added US$137m to its market cap in the past week alone, let's see if underlying performance has been driving long-term returns.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. 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 three years of share price growth, Kosmos Energy moved from a loss to profitability. That kind of transition can be an inflection point that justifies a strong share price gain, just as we have seen here.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

It is of course excellent to see how Kosmos Energy has grown profits over the years, but the future is more important for shareholders. Take a more thorough look at Kosmos Energy's financial health with this free report on its balance sheet.

A Different Perspective

While the broader market gained around 25% in the last year, Kosmos Energy shareholders lost 18%. 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 1.5% 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. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Even so, be aware that Kosmos Energy is showing 3 warning signs in our investment analysis , you should know about...

But note: Kosmos Energy may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

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