X0508 4 2026-01-16 0 0001336917 Under Armour, Inc. UA 0000938869 WATSA V PREM ET AL 95 WELLINGTON STREET WEST SUITE 800 TORONTO A6 M5J 2N7 ONTARIO, CANADA 0 0 1 0 0000915191 FAIRFAX FINANCIAL HOLDINGS LTD/ CAN 95 WELLINGTON STREET WEST SUITE 800 TORONTO A6 M5J 2N7 ONTARIO, CANADA 0 0 1 0 0 Class C Common Shares 2026-01-16 4 P 0 1837686 5.5953 A 11295041 I See Footnote Class C Common Shares 2026-01-20 4 P 0 1769581 5.6175 A 13064622 I See Footnote Class C Common Shares 2026-01-21 4 P 0 5000000 5.8923 A 18064622 I See Footnote Represents the weighted average price of the Class C Common Shares purchased on January 16, 2026, ranging from a low of $5.450 to a high of $5.700 per share. The Reporting Persons undertake, upon request by the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer to provide full information regarding the number of shares purchased at each separate price. These securities are held by wholly-owned subsidiaries of Fairfax Financial Holdings Limited. Mr. Watsa is the Chief Executive Officer and controlling person of Fairfax Financial Holdings Limited through certain holding companies he controls, including The Second 810 Holdco Ltd, The Second 1109 Holdco Ltd, and The Sixty Two Investment Company Limited. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Exchange Act, except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner for the purpose of Section 16 of the Exchange Act, or for any other purpose. Represents the weighted average price of the Class C Common Shares purchased on January 20, 2026, ranging from a low of $5.510 to a high of $5.800 per share. The Reporting Persons undertake, upon request by the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer to provide full information regarding the number of shares purchased at each separate price. Represents the weighted average price of the Class C Common Shares purchased on January 21, 2026, ranging from a low of $5.685 to a high of $5.940 per share. The Reporting Persons undertake, upon request by the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer to provide full information regarding the number of shares purchased at each separate price. /s/ V. Prem Watsa 2026-01-21 /s/ Peter Clarke, President and Chief Operating Officer, on behalf of Fairfax Financial Holdings Limited 2026-01-21