GMS Investor Presentation Deck

Income Before Taxes to Adjusted Net Income ($ in 000s) (Unaudited) Income before taxes EBITDA adjustments 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. $ $ 98,383 $ 102,922 7,849 11,111 117,343 28,749 $ 88,594 24.5% es es 4Q23 $ 41,239 41,913 4Q22 4,790 13,226 120,938 29,630 $ 91,308 24.5% 2.15 $ 2.11 $ 42,977 43,776 2.12 2.09 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 22

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