SEC FORM 3

SEC Form 3

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
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Peck Raphael J

(Last)

(First)

(Middle)

1020 HULL STREET

(Street)

BALTIMORE

21230

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
02/21/2008

3. Issuer Name and Ticker or Trading Symbol
Under Armour, Inc. [ UA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	VP of Footwear and Accessories

5. If Amendment, Date of 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

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	45,264.02⁽¹⁾	D

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: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee Stock Option (Right to Buy)	⁽²⁾	12/31/2010	Class A Common Stock	93,200	$2.11	D
Employee Stock Option (Right to Buy)	⁽³⁾	09/30/2013	Class A Common Stock	12,000	$2.11	D
Employee Stock Option (Right to Buy)	⁽⁴⁾	05/07/2017	Class A Common Stock	8,000	$45.12	D

Explanation of Responses:

1. Includes shares purchased through the Under Armour, Inc. Employee Stock Purchase Plan.

2. This option originally for 180,000 shares is exercisable as to 30,000 shares on each of February 1, 2005, February 1, 2006, February 1, 2007 and February 1, 2008 and 60,000 shares on February 1, 2009.

3. This option originally for 60,000 shares is exercisable in 5 equal annual installments beginning September 30, 2004.

4. Exercisable in five equal annual installments beginning May 8, 2008.

Remarks:

Exhibit List Exhibit 24 - Power of Attorney

	By: /s/ John P. Stanton, Attorney in Fact For: Raphael J. Peck	02/25/2008
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.