Baltimore, MD (November 5, 2007) – Under Armour, Inc. (NYSE: UA) today announced that Kevin Plank, Chairman and CEO of Under Armour, Inc., filed a Form 4 with the SEC to report the sale of stock. On November 1, 2007, Mr. Plank and his family foundation and trusts, sold pursuant to Rule 144, 1,500,000 shares of Under Armour stock, consisting of 750,000 shares of Class A Common Stock and 750,000 shares of Class B Common Stock. The sales were done for asset diversification, tax and estate planning and charitable giving purposes. Following the sales, Mr. Plank still beneficially owns 12,500,000 shares of Class B Common Stock, representing approximately 25.7% of the total Class A and Class B shares outstanding as of September 30, 2007.

About Under Armour, Inc. Under Armour® (NYSE: UA) is a leading developer, marketer, and distributor of branded performance apparel, footwear, and accessories. The brand's moisture-wicking synthetic fabrications are engineered in many different designs and styles for wear in nearly every climate to provide a performance alternative to traditional natural fiber products. The Company's products are sold worldwide and worn by athletes at all levels, from youth to professional, on playing fields around the globe. The Under Armour global headquarters is in Baltimore, Maryland, with European headquarters in Amsterdam's Olympic Stadium, and additional offices in Denver, Hong Kong, Toronto, and Guangzhou, China. For further information, please visit the Company's website at www.underarmour.com.