Investor Presentaiton

STRONG, CONSISTENT FINANCIAL IMPROVEMENT DRIVEN BY KEY OBJECTIVES Grow Base Business Improve Margins Expand Service Offerings Revenue $bn $20.25 (1) +13% CAGR Adjusted EPS (2) (1) $7.57 +26% CAGR $7.10 $1.11 2015 2023E 2015 2023E Adjusted EBITDA (2) $mm Adjusted EBITDA Margin (2) (1) ~18% CAGR $1,931 (1) +260 bps 9.5% 6.9% $526 Develop Craft Skilled Labor ROIC (2) Disciplined & Value Creating Capital Deployment QUANTA 2015 2023E 2015 +500 bps 10.0% 5.0% 2015 2022 2023E (1) Based on the midpoint of Quanta's 2023E financial outlook provided on November 2, 2023. (2) Refer to appendix for a reconciliation of this non-GAAP financial measure to its most directly comparable GAAP financial measure. Page 7

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