X0306 4 2023-02-01 0 0001370946 Owens Corning OC 0001339551 Chambers Brian ONE OWENS CORNING PARKWAY TOLEDO OH 43659 1 1 0 0 Chair, President and CEO $.01 Par Value Common 2023-02-01 4 A 0 28251 0.00 A 211635 D $.01 Par Value Common 2023-02-01 4 A 0 100869 0.00 A 312504 D $.01 Par Value Common 2023-02-02 4 F 0 45745 102.97 D 266759 D $.01 Par Value Common 25 I By adult son Restricted stock units granted under the Owens Corning 2019 Stock Plan. Awarded in connection with the settlement of performance share units for the performance cycle ended December 31, 2022. Shares withheld upon the settlement of performance share units to satisfy tax withholding obligations. The reporting person may be deemed to have acquired beneficial ownership of these shares upon his adult child moving into his household. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/ Jeffrey S. Wilke, Attorney-in-Fact 2023-02-03