X0306 4 2022-02-05 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001672098 Brisendine L Briley Jr MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 0 1 0 0 EVP, General Counsel & Sec. Common Stock 2022-02-05 4 M 0 369 A 8837 D Common Stock 2022-02-05 4 F 0 110 181.15 D 8727 D Common Stock 2022-02-06 4 M 0 545 A 9272 D Common Stock 2022-02-06 4 F 0 193 181.15 D 9079 D Restricted Stock Units 2022-02-06 4 M 0 369 0.00 D Common Stock 369 737 D Restricted Stock Units 2022-02-06 4 M 0 545 0.00 D Common Stock 545 545 D Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis. On February 5, 2020, the Reporting Person was granted 1,475 restricted stock units, vesting in four equal annual installments beginning on February 5, 2021, subject to the Reporting Person's continued employment. On February 6, 2019, the Reporting Person was granted 2,180 restricted stock units, vesting in four equal annual installments beginning on February 6, 2020, subject to the Reporting Person's continued employment. /s/ Briley Brisendine 2022-02-08