X0306 4 2017-11-28 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001244711 ANKER ROSS MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 0 1 0 0 EVP, Category Mgmt, Mktg & IT Common Stock 2017-11-28 4 M 0 100 7.07 A 59381 D Common Stock 2017-11-28 4 S 0 100 71.50 D 59281 D Stock Options (right to buy) 7.07 2017-11-28 4 M 0 100 0.00 A 2025-01-06 Common Stock 100 146389 D 209,126 options were granted on January 9, 2015, and vest and become exercisable ratably in five installments on each anniversary of January 9, 2015, subject to continued employment. Prior to the transactions reported on this Form 4, 21,013 of these options that remain outstanding had vested. /s/ Briley Brisendine, Attorney-in-fact for Ross Anker 2017-11-29