X0306 4 2016-12-06 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001672083 BLACK DOUG MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 1 1 0 0 CEO Common Shares 2016-12-05 5 G 0 E 14000 0.00 D 379543 D Common Shares 2016-12-06 4 P 0 15000 32.80 A 394543 D Gift. This transaction was executed in multiple trades at prices ranging from $32.54 to $32.86 per share, inclusive. The price reported above reflects the weighted average sale price, rounded to the nearest hundredth. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares purchased at each separate price within the ranges described in this footnote. /s/ Briley Brisendine, Attorney-in-fact for Doug Black 2016-12-07