Ua 10-K

UNDER ARMOUR, INC. - 10-K - 20080222 - FORM

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

þ

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2007 or

¨

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to Commission File No. 001-33202

UNDER ARMOUR, INC.

(Exact name of re gistrant as specified in its charte r)

Maryland

(State or other jurisdiction of incorporation or organization)

52-1990078

(I.R.S. Employer Ide ntification No.)

1020 Hull Street Baltimore, Maryland 21230

(Addre ss of principal e xecutive office s) (Zip Code)

(410) 454-6428

(Registrant’s Te le phone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act: Class A Common Stock

(Title of e ach class)

New York Stock Exchange

(Name of each e xchange on which registered)

Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. No ¨ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. No þ Yes þ Yes ¨

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No ¨ Indicate by check mark if the disclosure of delinquent filers pursuant to Item 405 or Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s...