Under Armour (NYSE:UA) has certainly been one of the best success stories in the market over the last 5 to 10 years. The chart below shows the explosive growth that initial investors would have taken advantage of if they had purchased Under Armour shares when the company first went public.

With every great success story comes a brigade of eventual short-sellers who try to pick the top of a company's growth. For Under Armour, that time appears to be now.

Almost 12% of all Under Armour shares have been sold short, compared to competitor Nike which has seen about 1% of its shares sold short.

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