Under Armour, Inc. — Director's Dealing 2011

May 6, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Under Armour, Inc. (UA)
CIK: 0001336917
Period of Report: 2011-05-04

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-04	Class A Common Stock	C	28440	—	Acquired	28540	Direct
2011-05-04	Class A Common Stock	S	28440	$63.51	Disposed	100	Direct
2011-05-04	Class A Common Stock	C	12150	—	Acquired	12250	Direct
2011-05-04	Class A Common Stock	S	12150	$64.42	Disposed	100	Direct
2011-05-04	Class A Common Stock	C	7110	—	Acquired	7210	Direct
2011-05-04	Class A Common Stock	S	7110	$65.15	Disposed	100	Direct
2011-05-05	Class A Common Stock	C	19530	—	Acquired	19630	Direct
2011-05-05	Class A Common Stock	C	28080	—	Acquired	47710	Direct
2011-05-05	Class A Common Stock	C	90	—	Acquired	47800	Direct
2011-05-05	Class A Common Stock	S	19530	$64.66	Disposed	28270	Direct
2011-05-05	Class A Common Stock	S	28080	$65.21	Disposed	190	Direct
2011-05-05	Class A Common Stock	S	90	$65.97	Disposed	100	Direct
2011-05-06	Class A Common Stock	C	18990	—	Acquired	19090	Direct
2011-05-06	Class A Common Stock	S	18990	$65.5	Disposed	100	Direct
2011-05-06	Class A Common Stock	C	16830	—	Acquired	16930	Direct
2011-05-06	Class A Common Stock	S	16830	$66.32	Disposed	100	Direct
2011-05-06	Class A Common Stock	C	6930	—	Acquired	7030	Direct
2011-05-06	Class A Common Stock	S	6930	$67.01	Disposed	100	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-04	Class B Common Stock	$	C	28440	Disposed		Class A Common Stock (28440)	Direct
2011-05-04	Class B Common Stock	$	C	12150	Disposed		Class A Common Stock (12150)	Direct
2011-05-04	Class B Common Stock	$	C	7110	Disposed		Class A Common Stock (7110)	Direct
2011-05-05	Class B Common Stock	$	C	19530	Disposed		Class A Common Stock (19530)	Direct
2011-05-05	Class B Common Stock	$	C	28080	Disposed		Class A Common Stock (28080)	Direct
2011-05-05	Class B Common Stock	$	C	90	Disposed		Class A Common Stock (90)	Direct
2011-05-06	Class B Common Stock	$	C	18990	Disposed		Class A Common Stock (18990)	Direct
2011-05-06	Class B Common Stock	$	C	16830	Disposed		Class A Common Stock (16830)	Direct
2011-05-06	Class B Common Stock	$	C	6930	Disposed		Class A Common Stock (6930)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock (888976)	888976	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 $62.93 to $63.92. 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 $63.93 to $64.91. 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 $64.93 to $65.40. 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 $63.91 to $64.90. 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 $64.91 to $65.90. 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: This transaction was executed in multiple trades at prices ranging from $64.88 to $65.87. 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.

F9: This transaction was executed in multiple trades at prices ranging from $65.88 to $66.86. 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.

F10: This transaction was executed in multiple trades at prices ranging from $66.88 to $67.18. 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.

F11: 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.