Under Armour, Inc. — Director's Dealing 2011

Feb 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Under Armour, Inc. (UA)
CIK: 0001336917
Period of Report: 2011-02-01

Reporting Person: Plank Kevin A (Director, President and CEO, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-01	Class A Common Stock	C	47700	—	Acquired	47800	Direct
2011-02-01	Class A Common Stock	S	47700	$59.88	Disposed	100	Direct
2011-02-02	Class A Common Stock	C	20142	—	Acquired	20242	Direct
2011-02-02	Class A Common Stock	S	20142	$59.5	Disposed	100	Direct
2011-02-02	Class A Common Stock	C	27558	—	Acquired	27658	Direct
2011-02-02	Class A Common Stock	S	27558	$59.86	Disposed	100	Direct
2011-02-03	Class A Common Stock	C	45090	—	Acquired	45190	Direct
2011-02-03	Class A Common Stock	S	45090	$60.36	Disposed	100	Direct
2011-02-03	Class A Common Stock	C	2610	—	Acquired	2710	Direct
2011-02-03	Class A Common Stock	S	2610	$59.6	Disposed	100	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-01	Class B Common Stock	$	C	47700	Disposed		Class A Common Stock (47700)	Direct
2011-02-02	Class B Common Stock	$	C	20142	Disposed		Class A Common Stock (20142)	Direct
2011-02-02	Class B Common Stock	$	C	27558	Disposed		Class A Common Stock (27558)	Direct
2011-02-03	Class B Common Stock	$	C	2610	Disposed		Class A Common Stock (2610)	Direct
2011-02-03	Class B Common Stock	$	C	45090	Disposed		Class A Common Stock (45090)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock (926982)	926982	Indirect
Class B Common Stock	$		Class A Common Stock (390000)	390000	Indirect
Class B Common Stock	$		Class A Common Stock (308975)	308975	Indirect

Footnotes

F1: Shares sold pursuant to a 10b5-1 trading plan.

F2: 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.

F3: 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.

F4: 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.

F5: 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.

F6: 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.

F7: 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.

F8: 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.