Under Armour, Inc. — Director's Dealing 2011

May 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Under Armour, Inc. (UA)
CIK: 0001336917
Period of Report: 2011-04-29

Reporting Person: Plank J Scott (EVP of Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-29	Class A Common Stock	S	4712	$68.22	Disposed	1639108	Direct
2011-04-29	Class A Common Stock	S	5134	$69.1	Disposed	1633974	Direct
2011-04-29	Class A Common Stock	S	1614	$69.75	Disposed	1632360	Direct
2011-05-02	Class A Common Stock	S	6013	$65.82	Disposed	1626347	Direct
2011-05-02	Class A Common Stock	S	4492	$66.74	Disposed	1621855	Direct
2011-05-02	Class A Common Stock	S	734	$67.59	Disposed	1621121	Direct
2011-05-02	Class A Common Stock	S	221	$68.42	Disposed	1620900	Direct
2011-05-03	Class A Common Stock	S	8746	$64.94	Disposed	1612154	Direct
2011-05-03	Class A Common Stock	S	2494	$65.77	Disposed	1609660	Direct
2011-05-03	Class A Common Stock	S	220	$66.55	Disposed	1609440	Direct
2011-04-29	Class A Common Stock	S	1713	$68.22	Disposed	151213	Indirect
2011-04-29	Class A Common Stock	S	1866	$69.1	Disposed	149347	Indirect
2011-04-29	Class A Common Stock	S	586	$69.75	Disposed	148761	Indirect
2011-05-02	Class A Common Stock	S	2187	$65.82	Disposed	146574	Indirect
2011-05-02	Class A Common Stock	S	1633	$66.74	Disposed	144941	Indirect
2011-05-02	Class A Common Stock	S	266	$67.59	Disposed	144675	Indirect
2011-05-02	Class A Common Stock	S	79	$68.42	Disposed	144596	Indirect
2011-05-03	Class A Common Stock	S	3179	$64.94	Disposed	141417	Indirect
2011-05-03	Class A Common Stock	S	906	$65.77	Disposed	140511	Indirect
2011-05-03	Class A Common Stock	S	80	$66.55	Disposed	140431	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 $67.61 to $68.55. 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 $68.61 to $69.60. 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 $69.62 to $69.89. 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.

F5: This transaction was executed in multiple trades at prices ranging from $65.31 to $66.29. 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 $66.31 to $67.30. 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 $67.34 to $68.01. 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 $68.39 to $68.44. 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 $64.47 to $65.46. 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 $65.47 to $66.37. 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: This transaction was executed in multiple trades at prices ranging from $66.50 to $66.66. 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.