GMS Results Presentation Deck

Leverage Summary ($ mm) Cash and cash equivalents Revolving Credit Facilities First Lien Term Loan Senior Notes Capital Lease Obligations Installment Notes Total Debt Total Net Debt PF Adj. EBITDA Total Debt / PF Adj. EBITDA Net Debt / PF Adj. EBITDA GMS GYPSUM MANAGEMENT & SUPPLY, INC. (1) (2) (3) (4) (5) 10/31/22 1/31/23 4/30/23 7/31/23 10/31/23 LTM LTM LTM LTM LTM $124 $240 499 345 126 3 $1,214 $1,090 $662 1.8x 1.6x $187 $240 498 346 132 8 $1,223 $1,037 $668 1.8x 1.6x $164 $110 497 346 137 8 $1,099 $935 $684 1.6x 1.4x $81 $113 493 346 136 13 $77 $81 494 346 150 6 $1,102 $1,076 $1,021 $1,000 $678 $649 1.6x 1.5x 1.7x 1.5x Net of unamortized discount of $0.4mm, $0.3mm, $0.3mm, $2.5mm and $2.4mm as of October 31, 2022, January 31, 2023, April 30, 2023, July 31, 2023 and October 31, 2023 respectively. Net of deferred financing costs of $2.6 mm, $2.4mm, $2.1mm, $4.1mm and $3.9mm as of October 31, 2022, January 31, 2023, April 30, 2023, July 31, 2023 and October 31, 2023 respectively. Net of deferred financing costs of $4.5mm, $4.3mm, $4.1mm, $3.9mm and $3.8mm as of October 31, 2022, January 31, 2023, April 30, 2023, July 31, 2023 and October 31, 2023 respectively Net of unamortized discount of $0.2mm, $0.2mm, $0.1mm, $0.1mm, and $0.0mm as of October 31, 2022, January 31, 2023, April 30, 2023, July 31, 2023 and October 31, 2023 respectively. For a reconciliation Pro Forma Adjusted EBITDA to net income, the most directly comparable GAAP metric, see Appendix. 18

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