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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1. Name and Address of Reporting Person *   Kraus William 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 of Marketing 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 75,000 D Â

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)	12/31/2011	Class A Common Stock	150,000	$ 0.75	D	Â
Employee Stock Option (right to buy)	  (2)	12/31/2010	Class A Common Stock	30,000	$ 2.11	D	Â

Reporting Owners

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

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 75,000 of the shares on December 31, 2004. The option becomes fully exercisable as to the remainder of the shares on December 31, 2005.
(2)	The option became exercisable as to 6,000 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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