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 if you buy shares in a really great company, you can more than double your money. For instance the Kirby Corporation (NYSE:KEX) share price is 140% higher than it was three years ago. Most would be happy with that. Better yet, the share price has risen 3.9% in the last week. But this could be related to the buoyant market which is up about 4.2% in a week.

Since it's been a strong week for Kirby shareholders, let's have a look at trend of the longer term fundamentals.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. 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 three years of share price growth, Kirby achieved compound earnings per share growth of 72% per year. The average annual share price increase of 34% is actually lower than the EPS growth. So one could reasonably conclude that the market has cooled on the stock.

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

We know that Kirby has improved its bottom line over the last three years, but what does the future have in store? This free interactive report on Kirby's balance sheet strength is a great place to start, if you want to investigate the stock further.

A Different Perspective

It's nice to see that Kirby shareholders have received a total shareholder return of 41% over the last year. That's better than the annualised return of 8% over half a decade, implying that the company is doing better recently. Given the share price momentum remains strong, it might be worth taking a closer look at the stock, lest you miss an opportunity. 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 Kirby is showing 1 warning sign in our investment analysis , you should know about...

If you are like me, then you will not want to miss this free list of undervalued small caps that insiders are buying.

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.