GMS Results Presentation Deck

Solid Levels of Profitability Gross Profit & Gross Margin Gross Profit up YOY primarily due to incremental gross profit from acquisitions, the continued pass through of product inflation in Wallboard, Ceilings and Complementary Products and growth in commercial and multi- family sales volumes. ($ mm) $434.7 32.0% Fiscal Q1 2023 Gross Profit GMS GYPSUM MANAGEMENT & SUPPLY INC. $450.6 32.0% Fiscal Q1 2024 Gross Margin SG&A Higher SG&A expenses were primarily driven by recently acquired businesses, but also the result of inflationary wages and higher maintenance costs. SG & A percent of sales leverage was also negatively impacted by steel price deflation. ($ mm) $261.3 19.2% Fiscal Q1 2023 Adj. SG&A $279.2 19.8% Fiscal Q1 2024 -Adj. SG&A as % of Sales Net Income & Adj. EBITDA¹ Net income decreased 3.0% YOY from $89.5M to $86.8M. Included a 29% increase in interest expense and a one-time $1.4 million refinancing charge, offset by a one- time tax planning rate benefit. Adjusted EBITDA of $173.3 million with 12.3% AEBITDA margin. ($ mm) $175.0 12.9% Fiscal Q1 2023 1 Adj. EBITDA $173.3 ¹For a reconciliation of Adjusted SG&A, Adjusted Net Income, Adjusted EBITDA and Adjusted EBITDA Margin to the most directly comparable GAAP metrics, see Appendix. 12.3% Fiscal Q1 2024 1 -Adj. EBITDA Margin 6

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