X0306 4 2017-09-29 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001712371 Diaz Fred M MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 1 0 0 0 Common Shares 2017-09-29 4 A 0 105 0.00 A 1288 D Represents deferred stock units granted as director fees. The deferred stock units are fully vested on grant, but settlement is deferred until the earlier of Mr. Diaz's termination of board service and a change in control of the Issuer. /s/ Briley Brisendine, Attorney-in-fact for Fred M. Diaz 2017-10-03