X0306 4 2021-10-29 0 0001124941 BEACON ROOFING SUPPLY INC BECN 0001624514 CD&R Investment Associates IX, Ltd. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE NEW YORK NY 10152 0 0 1 0 0001726960 CD&R Boulder Holdings, L.P. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE NEW YORK NY 10152 0 0 1 0 Common Stock 2021-10-29 4 P 0 116945 51.306 A 14545973 I By affiliate These securities are owned directly by CD&R Boulder Holdings, L.P. ("CD&R Stockholder"). CD&R Associates IX, Ltd., as the general partner of CD&R Stockholder, may be deemed to beneficially own the shares of common stock held by CD&R Stockholder. CD&R Investment Associates IX, Ltd. expressly disclaims beneficial ownership of the shares of common stock held by CD&R Stockholder, except to the extent of its pecuniary interest therein. CD&R Investment Associates IX, Ltd., By: /s/ Rima Simson, Vice President, Treasurer and Secretary 2021-10-29 CD&R Boulder Holdings, L.P., By: CD&R Investment Associates IX, Ltd, general partner; By: /s/ Rima Simson, Vice President, Treasurer and Secretary 2021-10-29