X0306 4 2013-08-01 false 0001336917 Under Armour, Inc. UA 0001344637 Plank Kevin A 1020 HULL STREET BALTIMORE MD 21230 true true true false President, CEO, and Chairman Class A Common Stock 2013-08-01 4 C false 25200 0 A 25400 D Class A Common Stock 2013-08-01 4 C false 1575 0 A 1575 I By KD Plank LLC Class A Common Stock 2013-08-01 4 C false 1575 0 A 1575 I KD Plank #2 LLC Class A Common Stock 2013-08-01 4 C false 58800 0 A 84200 D Class A Common Stock 2013-08-01 4 C false 3675 0 A 5250 I By KD Plank LLC Class A Common Stock 2013-08-01 4 C false 3675 0 A 5250 I KD Plank #2 LLC Class A Common Stock 2013-08-01 4 S false 25200 68.41 D 59000 D Class A Common Stock 2013-08-01 4 S false 1575 68.41 D 3675 I By KD Plank LLC Class A Common Stock 2013-08-01 4 S false 1575 68.41 D 3675 I KD Plank #2 LLC Class A Common Stock 2013-08-01 4 S false 58800 69.1 D 200 D Class A Common Stock 2013-08-01 4 S false 3675 69.1 D 0 I By KD Plank LLC Class A Common Stock 2013-08-01 4 S false 3675 69.1 D 0 I KD Plank #2 LLC Class B Common Stock Class A Common Stock 1636365 1636365 I By Annuity Trust Class B Common Stock 2013-08-01 4 C false 25200 0 D Class A Common Stock 25200 17534485 D Class B Common Stock 2013-08-01 4 C false 1575 0 D Class A Common Stock 541700 512875 I By KD Plank LLC Class B Common Stock 2013-08-01 4 C false 1575 0 D Class A Common Stock 703750 674925 I KD Plank #2 LLC Class B Common Stock 2013-08-01 4 C false 58800 0 D Class A Common Stock 58800 17475685 D Class B Common Stock 2013-08-01 4 C false 3675 0 D Class A Common Stock 541700 509200 I By KD Plank LLC Class B Common Stock 2013-08-01 4 C false 3675 0 D Class A Common Stock 703750 671250 I KD Plank #2 LLC Class B Common Stock is convertible at any time at the option of the reporting person into shares of Class A Common Stock on a one-for-one basis, and has no expiration date. Shares of Class B Common Stock automatically convert to Shares of Class A Common Stock effective immediately upon the sale of the Class B shares by the reporting person. Shares sold pursuant to a 10b5-1 trading plan. This transaction was executed in multiple trades at prices ranging from $67.69 to $68.68. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $68.69 to $69.67. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ John P. Stanton, Attorney in Fact for Kevin A. Plank 2013-08-01