GMS Investor Conference Presentation Deck

Summary Quarterly Financials (In millions) (Unaudited) Wallboard Volume (MSF) Wallboard Price ($ /'000 Sq. Ft.) Wallboard Ceilings Steel framing Complementary products Net sales Cost of sales Gross profit Gross margin Operating expenses: Selling, general and administrative expenses Depreciation and amortization Total operating expenses Operating income Other (expense) income: Interest expense Write-off of discount and deferred financing costs Other income, net Total other expense, net Income before taxes Income tax expense Net income Business Days Net Sales by Business Day Beginning Branch Count Added Branches Ending Branch Count GMS GYPSUM MANAGEMENT & SUPPLY, INC. $ $ $ $ 1Q23 1,191 438 $ 522 $ 167 275 396 1,360 925 435 32.0% 268 32 300 135 (15) 2 (13) 122 32 90 $ 63 21.6 $ 286 3 289 2Q23 1,232 474 $ 585 160 278 409 1,431 966 465 32.5% 279 32 311 153 (16) 2 (14) 139 36 103 $ 289 2 291 $ 65 22.0 $ 3Q23 1,058 473 $ 501 147 234 353 1,235 832 402 32.6% 267 31 299 103 (17) 2 (15) 88 24 65 62 19.9 291 6 297 $ $ 4Q23 1,130 481 $ 545 $ 155 224 380 1,304 880 424 32.5% 280 31 311 114 (18) 3 (16) 98 23 76 $ 63 $ 20.7 $ 297 7 304 FY23 4,611 467 $ 2,152 $ 629 1,011 1,538 5,329 3,603 1,726 32.4% 1,094 127 1,221 505 (66) 8 (58) 448 115 333 253 21.1 286 18 304 $ $ 1Q24 1,204 475 571 175 237 426 1,410 959 451 32.0% 287 32 319 132 (19) (1) 2 (18) 114 27 87 64 22.0 304 1 305 18

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