On March 12, 2023, Katy K. Theroux, Executive Vice President, Chief Human Resources Officer of Cornerstone Building Brands, Inc. (the “ Company ”), informed the Company that she would decline the Company's request to relocate to the Company's headquarters in Cary, North Carolina due to family circumstances. Consequently, the Company and Ms. Theroux have decided that Ms. Theroux will depart from the Company. Ms. Theroux and the Company have agreed that Ms. Theroux will remain in her current role through the earlier of (a) June 30, 2023 or (b) until a successor is appointed (the “ Separation Date ”) and will continue to be available for consulting and advisory support through December 31, 2023 to ensure a smooth transition (“ Transition Period ”).

Ms. Theroux will be entitled to the severance benefits pursuant to Ms. Theroux's existing Employment Agreement entered into between the Company and Ms. Theroux dated June 1, 2016 (“ Employment Agreement ”) that are payable upon resignation by Ms. Theroux for “Good Reason” as defined in the Employment Agreement. Ms. Theroux's existing restrictive covenants related to noncompetition, non-solicitation and similar matters will remain in effect in accordance with their terms, and the applicable post-termination periods of coverage will commence at the Separation Date. In exchange for Ms. Theroux's agreement to provide consulting and advisory services through the Transition Period, Ms. Theroux's services during this period will be treated as service for purposes of vesting in the value of her equity awards that vest through the end of the Transition Period (but not as to any period following the Transition Period).