GMS Results Presentation Deck

Attractive Capital Structure Supports Strategic Priorities $6.6 M ($6.9M) Q124 Cash from Operations Improved $11M Substantial Liquidity $81.4 million of cash on hand and $816.2 million available under our revolving credit facility. Q124 Use of Free Cash Flow 1 Increased Share Repurchase Activity Repurchased approximately 469 thousand shares for $30.5 million during Q1 FY24; $69.6 million of repurchase authorization remaining GMS GYPSUM MANAGEMENT & SUPPLY INC 5. Improved $8M Debt/Lease Payments 14% Capital Expenditures 15% Share Repurchases 18% 3-Year Historical Use of Cash4 Acquisitions 53% For Fiscal Years 2021, 2022 and 2023 LTM Net Debt / PF Adjusted EBITDA² 1.8x 7/31/2022 $ in millions $43 FY24 1.6x 1.6x 10/31/2022 1/31/2023 4/30/2023 $41 Debt³ Maturity Schedule FY25 $34 $28 FY26 1.4x FY27 1. For a reconciliation of free cash flow to cash used in operating activities, the most directly comparable GAAP metric, see Appendix. 2. For detail, including a reconciliation of Pro Forma Adjusted EBITDA to net income, the most directly comparable GAAP metric, see Appendix. Debt includes First Lien Term Loan, ABL Facility, Senior Notes, Finance Leases & Installment Notes. 3. 4. Includes cash used for Capital Expenditures, Acquisitions, Share Repurchases, Payments on Principal on Long-Term Debt and Payments on Principal on Finance Lease Obligations for fiscal years 2021, 2022 and 2023 Balance sheet, capital structure and share repurchase authorization references are as at 7/31/23. $134 FY28 1.5x 7/31/2023 $834 Thereafter 7

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