GMS Results Presentation Deck

Q1 Fiscal 2024 Sales Highlights Mixed end market economics, with continuing multi-family demand and strength in myriad commercial applications, offset by softness in single-family and office. Resilient Wallboard, Ceilings and Complementary Products pricing, but with deflationary trends in Steel Framing and Lumber. $1.4B Q124 Net Sales Total Per Day Net Sales 2.1% U.S. Residential Sales Wallboard Per Day Net Sales Q124 Q123 Change $ 8.9 $8.3 7.9% $ 2.7 $ 2.7 3.1% Steel Framing $ 3.7 $ 4.4 -15.2% Complementary Products $ 6.7 $ 6.3 6.0% Ceilings $ 22.0 $ 21.6 2.1% GMS GYPSUM MANAGEMENT & SUPPLY INC. Per Day Sales 3.5% U.S. Commercial Sales Per Day Sales 0.6% Per Day Organic Sales Q124 Q123 Change $8.9 $8.3 7.6% $ 2.7 $ 2.7 0.4% $ 3.7 $ 4.4 - 16.3% $ 6.2 $ 6.3 -0.9% $21.5 $ 21.7 -0.6% Per Day Organic Growth Volume Price/Mix/Fx -0.6% -1.1% 12.9% 8.2% 1.5% -29.2% U.S. Wallboard Volume For GMS Multi-Family - Up 22.1% Commercial - Up 5.9% Single-Family - Down 12.5% 5

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