UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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☐	Preliminary Proxy Statement
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☐	Definitive Proxy Statement
☑	Definitive Additional Materials
☐	Soliciting Material under §240.14a-12

UNDER ARMOUR, INC.

(Name of registrant as specified in its charter)

(Name of person(s) filing proxy statement, if other than the registrant)

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Your Vote Counts! UNDER ARMOUR, INC. 2024 Annual Meeting Vote by September 3, 2024 11:59 PM ET UNDER ARMOUR, INC. ATTN: CORPORATE SECRETARY 1020 HULL STREET BALTIMORE, MARYLAND 21230 V53565-P14049 You invested in UNDER ARMOUR, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting of Stockholders. This is an important notice regarding the availability of proxy materials for the annual meeting of stockholders to be held on September 4, 2024 at 12:00 PM Eastern Time.Get informed before you vote View the Proxy Statement and Under Armour, Inc.’s Fiscal Year 2024 Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to August 21, 2024. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* September 4, 2024 12:00 PM Eastern Time Virtually at: www.virtualshareholdermeeting.com/UAA2024 *Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1. Election of Directors Nominees: 01) Douglas E. Coltharp 04) Carolyn N. Everson 07) Eric T. Olson 02) Jerri L. DeVard 05) David W. Gibbs 08) Kevin A. Plank 03) Mohamed A. El-Erian 06) Karen W. Katz 09) Patrick W. Whitesell 2. To approve, by a non-binding advisory vote, the compensation of executives as disclosed in the “Executive Compensation” section of the proxy statement, including the Compensation Discussion and Analysis and tables. 3. To approve the amendment and restatement of the Company’s Class C Employee Stock Purchase Plan to increase the number of shares of Class C Common Stock authorized for issuance, among other changes. 4. Ratification of appointment of independent registered public accounting firm for the fiscal year ending March 31, 2025. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Board Recommends For For For For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V53566-P14049