GMS Results Presentation Deck

Reported SG&A to Adjusted SG & A (Unaudited) ($ in millions) SG&A - Reported Adjustments Stock appreciation rights Redeemable noncontrolling interests Equity-based compensation Severance and other permitted costs Transaction costs (acquisition and other) Gain (loss) on disposal of assets Debt transaction costs SG&A - Adjusted % of net sales GMS GYPSUM MANAGEMENT & SUPPLY INC (A) (B) (C) (D) (E) $ $ Reconciliation 1Q23 267.7 $ (2.3) (0.5) (3.1) (0.4) (0.4) 0.3 261.3 19.2% $ 2Q23 279.0 $ (3.2) (0.3) (3.8) (0.4) (0.3) (0.1) 270.9 $ 18.9% 3Q23 (0.3) (0.4) (3.3) 0.3 (0.5) 0.4 4Q23 267.4 $ 279.8 $ 1,093.8 $ 286.8 263.6 $ 21.4% FY2023 (1.8) 0.0 (3.0) (2.4) (0.8) 0.8 (7.7) (1.2) (13.2) (2.9) 1Q24 (2.0) (0.2) 1.4 (0.2) 272.4 $1,068.1 $ 20.9% 20.0% (1.2) (0.5) (3.3) (0.4) (1.4) 0.1 (0.9) 279.2 19.8% Commentary A. Represents changes in the fair value of stock appreciation rights B. Represents changes in the fair value of noncontrolling interests C. Represents non-cash equity-based compensation expense related to the issuance of share-based awards D. Represents severance expenses and other costs permitted in calculations under the ABL Facility and the Term Loan Facility E. Represents one-time costs related to acquisitions paid to third parties 18

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