If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. Long term Under Armour, Inc. (NYSE:UAA) shareholders know that all too well, since the share price is down considerably over three years. Unfortunately, they have held through a 54% decline in the share price in that time. Furthermore, it’s down 31% in about a quarter. That’s not much fun for holders.

Since shareholders are down over the longer term, lets look at the underlying fundamentals over the that time and see if they’ve been consistent with returns.

Check out our latest analysis for Under Armour

To quote Buffett, ‘Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace…’ 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).

Over the three years that the share price declined, Under Armour’s earnings per share (EPS) dropped significantly, falling to a loss. Extraordinary items contributed to this situation. Due to the loss, it’s not easy to use EPS as a reliable guide to the business. However, we can say we’d expect to see a falling share price in this scenario.

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

Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here.

Under Armour shareholders are down 19% for the year, but the market itself is up 16%. 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 7% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. You could get a better understanding of Under Armour’s growth by checking out this more detailed historical graph of earnings, revenue and cash flow.

We will like Under Armour better if we see some big insider buys. While we wait, check out this free list of undervalued stocks (mostly small caps) with considerable, recent, insider 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.