Under Armour, Inc. (NYSE: UA) is getting walloped to the tune of 5.5% despite seemingly strong Q1 results. Sterne Agee analyst Sam Poser believes this was related to guidance, which he views as "conservative." He is telling clients that today's sell-off crates a buying opportunity.

Poser comments, "Modus operandi of strong beats followed by conservative guidance continues. UA raised 2014 revenue guidance only by the amount of the beat in 1Q, citing difficult comparisons for the balance of the year and warmer in YOY weather in 4Q14. The beat in 1Q was broad-based across all channels and segments, which clearly speaks to the power of the brand, and multiple top line driver in the future. Spending is controlled, and necessary for the growth to continue.

The firm is raising FY14 & FY15 EPS estimates from $0.94 & $1.28 to $0.95 & $1.29 and would not be surprised to see even better results. The firm maintained a Buy rating and $63 price target.

For an analyst ratings summary and ratings history on Under Armour, Inc. click here. For more ratings news on Under Armour, Inc. click here.

Shares of Under Armour, Inc. closed at $54.44 yesterday.