GMS Investor Conference Presentation Deck

Proven Track Record of Growth & Improved Profitability $ milions 1858 0.074 FY-16 GMS GYPSUM MANAGEMENT & SUPPLY, INC. 2319 0.081 FY-17 2511 0.079 3116 0.095 FY-19 FY-18 ■Net Sales 3241 0.092 FY-20 3299 0.097 4634.9 0.122 5313.803 0.125 FY-21 FY-22 ◆Adj. EBITDA Margin* LTM Q323 *For a reconciliation of Adjusted EBITDA and Adjusted EBITDA margin to the most directly comparable GAAP metrics, see Appendix. Note: LTM Q323 refers to the twelve months ended January 31, 2023. CAGR FY-16 through LTM Q323: Net Sales: ↑ 16.8% Adjusted EBITDA*: 1 26.2% 11

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