GMS Investor Conference Presentation Deck

GMS at a Glance 52yrs Founded in 1971 -300 Distribution yard locations across the U.S. & Canada $5.3B LTM Q3 FY23¹ Net Sales 100+ Tool Sales, Rentals & Service Centers $665.6M LTM Q3 FY23 Adj. EBITDA² 6,500+ GMS Team Members 1. LTM Q3 FY23 is defined as the twelve months ended January 31, 2023 2. For a reconciliation of Adjusted EBITDA to the most directly comparable GAAP metrics, see Appendix. Information as of March 2023 unless otherwise noted 50+ Leading Brands GMS NYSE Ticker Symbol MAX MAX DRHORTON Ameter Builder Green Card MAX RT ******** GreenGuan MA BATON under IV NODHOHA rhorton.com XS 255K HIPRO

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