Exhibit 99.1 April 29, 2026 SiteOne Landscape Supply Announces First Quarter 2026 Earnings First Quarter 2026 Highlights (Compared to First Quarter 2025): Post Quarter Highlights · Amended ABL Facility and extended maturity to April 2031 ROSWELL, Ga. — (BUSINESS WIRE) — SiteOne Landscape Supply, Inc. (the "Company" or "SiteOne") (NYSE: SITE) announced earnings for its first quarter ended March 29, 2026 ("First Quarter 2026"). "We are pleased with our first quarter performance as we more than offset the weat ...