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 J Scott (EVP of Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-04	Class A Common Stock	S	6967	$63.52	Disposed	1602473	Direct
2011-05-04	Class A Common Stock	S	2861	$64.45	Disposed	1599612	Direct
2011-05-04	Class A Common Stock	S	1632	$65.16	Disposed	1597980	Direct
2011-05-05	Class A Common Stock	S	3447	$64.59	Disposed	1594533	Direct
2011-05-05	Class A Common Stock	S	7866	$65.15	Disposed	1586667	Direct
2011-05-05	Class A Common Stock	S	147	$65.95	Disposed	1586520	Direct
2011-05-06	Class A Common Stock	S	5349	$65.52	Disposed	1581171	Direct
2011-05-06	Class A Common Stock	S	4341	$66.36	Disposed	1576830	Direct
2011-05-06	Class A Common Stock	S	1760	$67.01	Disposed	1575070	Direct
2011-05-04	Class A Common Stock	S	2533	$63.52	Disposed	137898	Indirect
2011-05-04	Class A Common Stock	S	1039	$64.45	Disposed	136859	Indirect
2011-05-04	Class A Common Stock	S	593	$65.16	Disposed	136266	Indirect
2011-05-05	Class A Common Stock	S	1253	$64.59	Disposed	135013	Indirect
2011-05-05	Class A Common Stock	S	2859	$65.15	Disposed	132154	Indirect
2011-05-05	Class A Common Stock	S	53	$65.95	Disposed	132101	Indirect
2011-05-06	Class A Common Stock	S	1951	$65.52	Disposed	130150	Indirect
2011-05-06	Class A Common Stock	S	1584	$66.36	Disposed	128566	Indirect
2011-05-06	Class A Common Stock	S	640	$67.01	Disposed	127926	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	506346	Indirect
Class A Common Stock	100000	Indirect

Footnotes

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

F2: This transaction was executed in multiple trades at prices ranging from $62.93 to $63.91. 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.

F3: This transaction was executed in multiple trades at prices ranging from $63.93 to $64.89. 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 $64.97 to $65.34. 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 $63.82 to $64.81. 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 $64.82 to $65.80. 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 $65.86 to $66.04. 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 $64.89 to $65.88. 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 $65.89 to $66.88. 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 $66.89 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.