(Mark One) ANNUAL REPORT PURSUANT TO SECTION13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year endedMarch 31, 2025 For the transition period from to UNDER ARMOUR, INC. Maryland Securities registered pursuant to Section 12(b) of the Act: Securities registered pursuant to Section12(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.Yes☑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. Yes☐No☑ Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934 during thepreceding 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 thepast 90 days.Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuant to Rule 405 ofRegulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles).Yes☑No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerginggrowth company. See definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of theExchange Act. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revisedfinancial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its auditreport.☑ Table of Contents If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflectthe correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by anyof the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☑ As of September 30, 2024, the last business day of the registrant's most recently completed second fiscal quarter, the aggregate market value of the registrant’sClass A Common Stock and Class C Common Stock held by non-affiliates was $1,678,862,452and $1,564,372,255, respectively. As of May 15, 2025 there were188,822,726shares of ClassA Common Stock,34,450,000shares of Class B Convertible Common Stock and202,847,601sharesof Class C Common Stock outstanding. DOCUMENTS INCORPORATED BY REFERENCE Portions of Under Armour, Inc.’s Proxy Statement for the Annual Meeting of Stockholders to be held on September3, 2025 are incorporated by reference in Part IIIof this Annual Report on Form 10-K. UNDER ARMOUR, INC.ANNUAL REPORT ON FORM 10-KTABLE OF CONTENTS PART I. FORWARD-LOOKING STATEMENTS Some of the statements contained in this Annual Report on Form 10-K constitute forward-looking statements. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similarexpressions concerning matters that are not historical facts, such as statements regarding our share repurchase program, ourfuture financial condition or results of operations, our prospects and strategies for future growth, potential restructuring efforts,including the scope of these restructuring efforts and the amount of potential charges and costs, the timing of these measures andthe anticipated benefits of our restructuring plans, expectations regarding promotional activities, freight, product cost pressuresand foreign currency impacts, the impact of global economic conditions including changes in global trade policy and inflation onour results of operations, our liquidity and use of capital resources, the development and introduction of new products, theimplementation of our marketing and branding strategies, the future benefits and opportunities from significant investments andthe impact of litigation or other proceedings. In many cases, you can identify forward-looking statements by terms such as "may,""will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "