Owens Corning

10b5-1 Plans

On October 31, 2023, Gunner Smith, the Company's President, Roofing, entered into a written plan for the sale of shares of Company common stock, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934 (the “Exchange Act”). Mr. Smith’s plan provides for the sale of 12,515 shares of Company common stock in the aggregate underlying future vesting restricted stock units and performance stock units (“PSUs”) that are expected to vest during the term of the plan. The amount of shares disclosed above has not been reduced by the number of shares that may be withheld for income taxes, and assumes that the PSUs will vest at 100% attainment. The actual number of PSUs that may vest can vary between 0% - 200% of the target award amount, subject to the achievement of certain performance conditions as set forth in the PSU award agreement, and the number of shares sold pursuant to Mr. Smith’s plan may increase or decrease accordingly. This plan is scheduled to terminate no later than October 25, 2024.

On December 13, 2023, José Méndez-Andino, the Company's Executive Vice President, Chief Research and Development Officer, entered into a written plan for the sale of up to 2,833 shares of Company common stock, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. This plan is scheduled to terminate no later than December 13, 2024.

On December 14, 2023, Paula Russell, the Company's Executive Vice President, Chief Human Resources Officer, entered into a written plan for the sale of up to 3,765 shares of Company common stock, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act. This plan is scheduled to terminate no later than November 29, 2024.