GMS Investor Presentation Deck

Attractive Capital Structure Supports Strategic Priorities Higher capital expenditures $441.7M due to opportunistic purchases $389.1M of off-lease equipment and certain building and leasehold improvements FY23 Cash from Operations Up 146% Substantial Liquidity $164.7 million of cash on hand and $759.2 million available under our revolving credit facilities at 4/30/23 Increased Share Repurchase Activity Repurchased 2.3 million shares for $110.6 million during FY23; $100.2 million of repurchase authorization remaining at 4/30/23 GMS GYPSUM MANAGEMENT & SUPPLY, INC. FY23 Free Cash Flow¹ Debt/Lease Payments 14% Capital Expenditures 15% Share Repurchases 18% Up 181% 3-Year Historical Use of Cash4 Acquisitions 53% LTM Net Debt / PF Adjusted EBITDA² 1.8x 1.8x $ in millions 4/30/2022 7/31/2022 10/31/2022 1/31/2023 4/30/2023 $52 Debt³ Maturity Schedule as of 04/30/23 Adjusted for Amended Term Loan FY24 1.6x 1. 2. For a reconciliation of free cash flow to cash used in operating activities, the most directly comparable GAAP metric, see Appendix. For detail, including a reconciliation of Pro Forma Adjusted EBITDA to net income, the most directly comparable GAAP metric, see Appendix. 3. Debt includes First Lien Term Loan, ABL Facility, Senior Notes, Finance Leases & Installment Notes. 4. $38 $31 FY25 FY26 $25 1.6x FY27 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 1.4x $128 $831 FY28 Thereafter 12

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