GMS Investor Presentation Deck

GMS is Well Positioned across Commercial and Residential Markets with Scale and Balanced Product Mix Strategic Investments Position GMS for Near-Term Industry Dynamics & Long-Term Success Opened 32 greenfield locations and completed 15 strategic acquisitions* since the start of fiscal 2020 to enhance customer service, drive growth in product offerings and improve efficiencies, all while reducing our net debt leverage ratio from 3.6x at April 30, 2019 to 1.4x at April 30, 2023 ● ● ● ● ● ● ● Continuing to modernize and upgrade fleet, adding safety features to protect employees and customers and for risk management benefits Technology investments to automate work has led to increased productivity, making us better operators Lowering complexity costs in the business Industry Fundamentals Support Outlook Continue to see near-term high levels of multi-family residential activity While varying by region, we expect single-family demand levels to continue to improve from lows experienced over the last ~8-12 months. We expect continued near-term YOY declines as we roll over challenging comparisons, but we also expect those to improve over the balance of the fiscal year as our current run rates and comments from some large builders continue to provide encouraging signs for the single-family end market. Year-over-year improvement in commercial construction activity expected in near-term Favorable demographics in an underbuilt industry provides support for the medium- to long-term GMS GYPSUM MANAGEMENT & SUPPLY, INC. *Greenfield and acquisition totals are calculated since the start of fiscal 2020 through April 30, 2023. Therefore, excluded from these totals is the acquisition of Jawl Lumber Corporation on Vancouver Island, which was completed just after the end of fiscal 2023. 13

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