X0609 4 2026-05-13 0 0001650729 SiteOne Landscape Supply, Inc. SITE 0001305807 Dunbar Webster Roy false MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL GA 30076 1 0 0 0 0 Common Stock 2026-05-13 4 A 0 1186 0 A 11671 D Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company. Includes deferred stock units. Exhibit 24 - Power of Attorney /s/ Travis Jackson, Attorney-in-fact for W. Roy Dunbar 2026-05-14