X0303 4 2011-02-01 0 0001336917 Under Armour, Inc. UA 0001344637 Plank Kevin A 1020 HULL STREET BALTIMORE MD 21230 1 1 1 0 President and CEO Class A Common Stock 2011-02-01 4 C 0 47700 A 47800 D Class A Common Stock 2011-02-01 4 S 0 47700 59.88 D 100 D Class A Common Stock 2011-02-02 4 C 0 20142 A 20242 D Class A Common Stock 2011-02-02 4 S 0 20142 59.5 D 100 D Class A Common Stock 2011-02-02 4 C 0 27558 A 27658 D Class A Common Stock 2011-02-02 4 S 0 27558 59.86 D 100 D Class A Common Stock 2011-02-03 4 C 0 45090 A 45190 D Class A Common Stock 2011-02-03 4 S 0 45090 60.36 D 100 D Class A Common Stock 2011-02-03 4 C 0 2610 A 2710 D Class A Common Stock 2011-02-03 4 S 0 2610 59.6 D 100 D Class B Common Stock 2011-02-01 4 C 0 47700 D Class A Common Stock 47700 10701343 D Class B Common Stock 2011-02-02 4 C 0 20142 D Class A Common Stock 20142 10681201 D Class B Common Stock 2011-02-02 4 C 0 27558 D Class A Common Stock 27558 10653643 D Class B Common Stock 2011-02-03 4 C 0 2610 D Class A Common Stock 2610 10651033 D Class B Common Stock 2011-02-03 4 C 0 45090 D Class A Common Stock 45090 10605943 D Class B Common Stock Class A Common Stock 926982 926982 I By Annuity Trust Class B Common Stock Class A Common Stock 390000 390000 I By KD Plank #2 LLC Class B Common Stock Class A Common Stock 308975 308975 I By KD Plank LLC Shares sold pursuant to a 10b5-1 trading plan. 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. This transaction was executed in multiple trades at prices ranging from $59.54 to $60.39. The price reported above reflects the weighted average sale 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 $59.34 to $59.56. The price reported above reflects the weighted average sale 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 $59.57 to $60.56. The price reported above reflects the weighted average sale 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 $59.78 to $60.77. The price reported above reflects the weighted average sale 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 $59.42 to $59.76. The price reported above reflects the weighted average sale 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. 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. By: /s/ John P. Stanton, Attorney in Fact For: Kevin A. Plank 2011-02-03