Under Armour, Inc. (NYSE:UAA) shareholders should be happy to see the share price up 18% in the last month. But over the last three years we've seen a quite serious decline. Indeed, the share price is down a tragic 67% in the last three years. So it's good to see it climbing back up. The rise has some hopeful, but turnarounds are often precarious.

After losing 8.7% this past week, it's worth investigating the company's fundamentals to see what we can infer from past performance.

See our latest analysis for Under Armour

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

Under Armour saw its share price decline over the three years in which its EPS also dropped, falling to a loss. This was, in part, due to extraordinary items impacting earnings. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

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

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

A Different Perspective

While the broader market gained around 25% in the last year, Under Armour shareholders lost 1.5%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. However, the loss over the last year isn't as bad as the 10% per annum loss investors have suffered over the last half decade. We'd need to see some sustained improvements in the key metrics before we could muster much enthusiasm. Shareholders might want to examine this detailed historical graph of past earnings, revenue and cash flow.

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: many of them are unnoticed AND have attractive valuation).

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.