X0306 4 2018-01-16 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001672134 Convers Pascal MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 0 1 0 0 EVP, Strategy and Development Common Stock 2018-01-16 4 M 0 9750 5.50 A 106708 D Common Stock 2018-01-16 4 S 0 9750 71.29 D 96958 D Stock Options (right to buy) 5.50 2018-01-16 4 M 0 9750 0.00 D 2024-09-30 Common Stock 9750 189626 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person on December 1, 2017. The price reported in column 4 is a weighted average price. The shares were sold at prices ranging from $71.01 to $71.86, inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. 209,126 options were granted on September 30, 2014, and vest and become exercisable ratably in five installments on each anniversary of December 23, 2013, subject to continued employment. Prior to the transactions reported on this Form 4, 157,551 of these options that remain outstanding had vested. s/ Briley Brisendine, Attorney-in-fact for Pascal Convers 2018-01-18