X0306 4 2017-11-30 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 2017-11-30 4 M 0 9750 5.50 A 106708 D Common Stock 2017-11-30 4 S 0 9750 74.25 D 96958 D Stock Options (right to buy) 5.50 2017-11-30 4 M 0 9750 0.00 A 2024-09-30 Common Stock 9750 199376 D The price reported in column 4 is a weighted average price. The shares were sold at prices ranging from $73.89 to $74.52, 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. These 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, 125,476 of these options are currently vested. /s/ Briley Brisendine, Attorney-in-fact for Pascal Convers 2017-11-30