GMS Results Presentation Deck

Income Before Taxes to Adjusted Net Income ($ in 000s) (Unaudited) Income before taxes EBITDA adjustments Write-off of debt discount and deferred financing fees Purchase accounting depreciation and amortization (A) Adjusted pre-tax income Adjusted income tax expense Adjusted net income Effective tax rate (B) Weighted average shares outstanding: Basic Diluted Adjusted net income per share: Basic Diluted Reconciliation GMS GYPSUM MANAGEMENT & SUPPLY, INC. $ 2Q24 $ 108,162 $ 139,148 8,009 8,238 $ $ 10,823 126,994 32,383 94,611 25.5% 40,466 41,088 2Q23 13,057 160,443 40,913 $ 119,530 25.5% 2.34 $ 2.30 $ 42,232 42,887 2.83 2.79 Commentary A. Depreciation and amortization from the increase in value of certain long-term assets associated with the April 1, 2014 acquisition of the predecessor company and amortization of intangible assets from the acquisitions of Titan, Westside Building Materials, and AMES Taping Tools B. Normalized cash tax rate determined based on our estimated taxes excluding the impact of purchase accounting and certain other deferred tax amounts 16

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