Investor Presentation

Key Financial Metrics (Non-GAAP) Strong Cash Generation, Margin Expansion, Income Growth Adjusted Cash Gross Profit ($MM) & Margin (%) (1.2) ୧୯୭ 38.8% $160.1 (3) 2Q16 39.3% $188.2 Adjusted Diluted Net Income ($MM) (1) 2Q17 $46.2 35.7% $502.3 37.2% $597.4 LTM 2Q16 LTM 2Q17 $53.6 +16% yly 2Q16 2Q17 See appendix for reconciliation of these non-GAAP metrics to the most comparable GAAP metrics Adjusted Cash Gross Profit Margin defined as Adjusted Cash Gross Profit divided by Net Revenue Adjusted EBITDA margin defined as Adjusted EBITDA divided by Net Revenue Adjusted diluted share count includes all outstanding Class A common stock and LP Units 6 Adjusted EBITDA ($MM) & Margin (%) (1.3) 27.8% $114.7 2Q16 28.3% $135.2 2Q17 $0.45 23.7% $333.9 Adjusted Diluted Earnings Per Share (1,4) 2Q16 $397.1 LTM 2Q16 LTM 2Q17 $0.48 24.7% +7% yly 2Q17 SUMMIT Materials

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