Under Armour, Inc. — Director's Dealing 2011

Feb 8, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Under Armour, Inc. (UA)
CIK: 0001336917
Period of Report: 2011-02-04

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-04	Class A Common Stock	S	880	$60.12	Disposed	1669708	Direct
2011-02-04	Class A Common Stock	S	1540	$61.57	Disposed	1668168	Direct
2011-02-04	Class A Common Stock	S	1687	$62.08	Disposed	1666481	Direct
2011-02-04	Class A Common Stock	S	3319	$63.43	Disposed	1663162	Direct
2011-02-04	Class A Common Stock	S	4034	$64.24	Disposed	1659128	Direct
2011-02-07	Class A Common Stock	S	6454	$64.22	Disposed	1652674	Direct
2011-02-07	Class A Common Stock	S	74	$63.42	Disposed	1652600	Direct
2011-02-07	Class A Common Stock	S	4932	$65.03	Disposed	1647668	Direct
2011-02-08	Class A Common Stock	S	147	$65.05	Disposed	1647521	Direct
2011-02-08	Class A Common Stock	S	1027	$65.65	Disposed	1646494	Direct
2011-02-08	Class A Common Stock	S	10276	$66.51	Disposed	1636218	Direct
2011-02-04	Class A Common Stock	S	320	$60.12	Disposed	172713	Indirect
2011-02-04	Class A Common Stock	S	560	$61.57	Disposed	172153	Indirect
2011-02-04	Class A Common Stock	S	613	$62.08	Disposed	171540	Indirect
2011-02-04	Class A Common Stock	S	1206	$63.43	Disposed	170334	Indirect
2011-02-04	Class A Common Stock	S	1466	$64.24	Disposed	168868	Indirect
2011-02-07	Class A Common Stock	S	2346	$64.22	Disposed	166522	Indirect
2011-02-07	Class A Common Stock	S	26	$63.42	Disposed	166496	Indirect
2011-02-07	Class A Common Stock	S	1793	$65.03	Disposed	164703	Indirect
2011-02-08	Class A Common Stock	S	53	$65.05	Disposed	164650	Indirect
2011-02-08	Class A Common Stock	S	373	$65.65	Disposed	164277	Indirect
2011-02-08	Class A Common Stock	S	3749	$66.51	Disposed	160528	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 $59.85 to $60.35. 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 $61.24 to $61.77. 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.

F4: This transaction was executed in multiple trades at prices ranging from $61.79 to $62.77. 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.

F5: This transaction was executed in multiple trades at prices ranging from $62.92 to $63.86. 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.

F6: This transaction was executed in multiple trades at prices ranging from $63.88 to $64.86. 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.

F7: This transaction was executed in multiple trades at prices ranging from $63.51 to $64.48. 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 $64.54 to $65.50. 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 $65.02 to $65.06. 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 $65.15 to $66.10. 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 $66.11 to $67.10. 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.