Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Plank Kevin A
  2. Issuer Name and Ticker or Trading Symbol
Under Armour, Inc. [UA]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
(Last)
(First)
(Middle)
1020 HULL STREET
3. Date of Earliest Transaction (Month/Day/Year)
11/02/2011
(Street)

BALTIMORE, MD 21230
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 11/02/2011   C   13,500 (1) A (2) 13,600 D  
Class A Common Stock 11/02/2011   S   13,500 (1) D $ 82.86 (3) 100 D  
Class A Common Stock 11/02/2011   C   29,070 (1) A (2) 29,170 D  
Class A Common Stock 11/02/2011   S   29,070 (1) D $ 83.62 (4) 100 D  
Class A Common Stock 11/02/2011   C   4,860 (1) A (2) 4,960 D  
Class A Common Stock 11/02/2011   S   4,860 (1) D $ 84.54 (5) 100 D  
Class A Common Stock 11/02/2011   C   270 (1) A (2) 370 D  
Class A Common Stock 11/02/2011   S   270 (1) D $ 85.34 (6) 100 D  
Class A Common Stock 11/03/2011   C   8,640 (1) A (2) 8,740 D  
Class A Common Stock 11/03/2011   S   8,640 (1) D $ 83.15 (7) 100 D  
Class A Common Stock 11/03/2011   C   11,160 (1) A (2) 11,260 D  
Class A Common Stock 11/03/2011   S   11,160 (1) D $ 84.19 (8) 100 D  
Class A Common Stock 11/03/2011   C   24,300 (1) A (2) 24,400 D  
Class A Common Stock 11/03/2011   S   24,300 (1) D $ 85.12 (9) 100 D  
Class A Common Stock 11/03/2011   C   3,600 (1) A (2) 3,700 D  
Class A Common Stock 11/03/2011   S   3,600 (1) D $ 85.77 (10) 100 D  
Class A Common Stock 11/04/2011   C   38,880 (1) A (2) 38,980 D  
Class A Common Stock 11/04/2011   S   38,880 (1) D $ 83.94 (11) 100 D  
Class A Common Stock 11/04/2011   C   3,510 (1) A (2) 3,610 D  
Class A Common Stock 11/04/2011   S   3,510 (1) D $ 84.93 (12) 100 D  
Class A Common Stock 11/04/2011   C   360 (1) A (2) 460 D  
Class A Common Stock 11/04/2011   S   360 (1) D $ 85.5 (13) 100 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Class B Common Stock (14) 11/02/2011   C     13,500 (1)   (14)   (14) Class A Common Stock 13,500 (14) 9,786,699 D  
Class B Common Stock (14) 11/02/2011   C     29,070 (1)   (14)   (14) Class A Common Stock 29,070 (14) 9,757,629 D  
Class B Common Stock (14) 11/02/2011   C     4,860 (1)   (14)   (14) Class A Common Stock 4,860 (14) 9,752,769 D  
Class B Common Stock (14) 11/02/2011   C     270 (1)   (14)   (14) Class A Common Stock 270 (14) 9,752,499 D  
Class B Common Stock (14) 11/03/2011   C     8,640 (1)   (14)   (14) Class A Common Stock 8,640 (14) 9,743,859 D  
Class B Common Stock (14) 11/03/2011   C     11,160 (1)   (14)   (14) Class A Common Stock 11,160 (14) 9,732,699 D  
Class B Common Stock (14) 11/03/2011   C     24,300 (1)   (14)   (14) Class A Common Stock 24,300 (14) 9,708,399 D  
Class B Common Stock (14) 11/03/2011   C     3,600 (1)   (14)   (14) Class A Common Stock 3,600 (14) 9,704,799 D  
Class B Common Stock (14) 11/04/2011   C     38,880 (1)   (14)   (14) Class A Common Stock 38,880 (14) 9,665,919 D  
Class B Common Stock (14) 11/04/2011   C     3,510 (1)   (14)   (14) Class A Common Stock 3,510 (14) 9,662,409 D  
Class B Common Stock (14) 11/04/2011   C     360 (1)   (14)   (14) Class A Common Stock 360 (14) 9,662,049 D  
Class B Common Stock (14)               (14)   (14) Class A Common Stock 888,976   888,976 I By Annuity Trust
Class B Common Stock (14)               (14)   (14) Class A Common Stock 390,000   390,000 I By KD Plank #2 LLC
Class B Common Stock (14)               (14)   (14) Class A Common Stock 308,975   308,975 I By KD Plank LLC

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Plank Kevin A
1020 HULL STREET
BALTIMORE, MD 21230
  X   X   President and CEO  

Signatures

 By: /s/ John P. Stanton, Attorney in Fact For: Kevin A. Plank   11/04/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares sold pursuant to a 10b5-1 trading plan.
(2) 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.
(3) This transaction was executed in multiple trades at prices ranging from $82.19 to $83.18. 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.
(4) This transaction was executed in multiple trades at prices ranging from $83.19 to $84.18. 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.
(5) This transaction was executed in multiple trades at prices ranging from $84.20 to $85.10. 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.
(6) This transaction was executed in multiple trades at prices ranging from $85.20 to $85.46. 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.
(7) This transaction was executed in multiple trades at prices ranging from $82.59 to $83.58. 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.
(8) This transaction was executed in multiple trades at prices ranging from $83.59 to $84.58. 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.
(9) This transaction was executed in multiple trades at prices ranging from $84.59 to $85.58. 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.
(10) This transaction was executed in multiple trades at prices ranging from $85.60 to $85.98. 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.
(11) This transaction was executed in multiple trades at prices ranging from $83.41 to $84.40. 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.
(12) This transaction was executed in multiple trades at prices ranging from $84.41 to $85.40. 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.
(13) This transaction was executed in multiple trades at prices ranging from $85.46 to $85.59. 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.
(14) 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.

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