X0306 4 2017-11-27 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001672096 GUTHRIE JOHN T MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 0 1 0 0 EVP, CFO and Assistant Sec. Common Stock 2017-11-27 4 M 0 20000 5.50 A 57854 D Common Stock 2017-11-27 4 S 0 20000 70.91 D 37854 D Stock Options (right to buy) 5.50 2017-11-27 4 M 0 20000 0.00 A 2024-05-19 Common Stock 20000 84563 D The price reported in column 4 is a weighted average price. The shares were sold at prices ranging from $70.48 to $71.50, 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 May 19, 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, 62,738 of these options had vested. /s/ Briley Brisendine, Attorney-in-fact for John T. Guthrie 2017-11-28