GMS Investor Presentation Deck

Strategic Growth Priorities – Q4 Fiscal 2023 Update - Platform Expansion Expand the platform through accretive acquisition and greenfield opportunities ● ● ● Expand Share in Core Products Capitalize on existing fixed investments in locations and equipment where we are underpenetrated or below expected share Industry data indicates that we are maintaining or growing share in each of our core product categories We have strengthened relationships and successfully won business in all of our end markets Solid growth in Architectural Specialty Ceilings Benefits of scale and our commitment to service provide value to our customers and confidence for continued growth in our core products GMS GYPSUM MANAGEMENT & SUPPLY, INC. Grow Complementary Products Grow Complementary Products opportunities outside of core products to diversify and profitably expand our offerings ● • 4.0% per day net sales growth 1.5% per day organic sales growth 12th straight quarter of growth for this category ● The Complementary Products Taskforce facilitates the sharing of best practices, identifies areas of opportunity, leverages our scale and consolidates vendors where sensible. During the 4th quarter we: Acquired EMJ in Chicago and Blair Building Materials in Toronto Opened a greenfield yard in Ontario, Canada Opened two new AMES store locations For the full year, we completed four acquisitions and opened six new greenfield yards and 11 AMES stores ● Drive Improved Productivity & Profitability Leverage our scale and employ technology and best practices to deliver a best-in-class customer experience and further profit improvement Enhancing our role as a valuable partner by providing customers with the ability to easily transact with us. Building our "Yard of the Future" to improve efficiency, productivity and profitability while delivering greater value to our customers and stakeholders Organization-wide effort to reduce complexity cost Driving purchasing and operational efficiencies and helping to offset operational cost increases As we've leveraged inflationary dynamics in the business, our productivity initiatives, along with growth in Complementary Products and expansion of scale, have enabled us to expand our Adjusted EBITDA margin from the upper single-digits in the years leading up to Covid to now consistently reporting these returns at double-digit levels for the past two fiscal years. 8

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