Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Peck Raphael J
 2. Date of Event Requiring Statement (Month/Day/Year)
11/17/2005		 3. Issuer Name and Ticker or Trading Symbol
Under Armour, Inc. [UARM]
(Last)
(First)
(Middle)
C/O UNDER ARMOUR, INC., 1020 HULL STREET, 3RD FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BALTIMORE, MD 21230		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Class A Common Stock 37,166
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy)   (1) 07/30/2012 Class A Common Stock 27,334 $ 0.75 D  
Employee Stock Option (right to buy)   (2) 09/30/2013 Class A Common Stock 55,500 $ 2.11 D  
Employee Stock Option (right to buy)   (3) 12/31/2010 Class A Common Stock 180,000 $ 2.11 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Peck Raphael J
C/O UNDER ARMOUR, INC.
1020 HULL STREET, 3RD FLOOR
BALTIMORE, MD 21230		       Vice President  

Signatures

/s/ Kevin M. Haley, attorney in fact 11/17/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) The option became exercisable as to 12,334 of the shares as of August 1, 2005. The option becomes exercisable as to the remainder of the shares on August 1, 2006.
(2) The option became exercisable as to 7,500 of the shares on September 30, 2004, and as to 12,000 of the shares as of September 30, 2005. The option becomes exercisable as to the remainder of the shares in three equal installments beginning September 30, 2006
(3) The option became exercisable as to 30,000 of the shares as of February 1, 2005. The option becomes exercisable as to the remainder of the shares in four equal annual installments beginning February 1, 2006.
 
Remarks:
Exhibit List Exhibit 24 - Power of Attorney

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