FOR IMMEDIATE RELEASE 26-08 Contacts: Jayshree Desai, CFO Media – Mili Gosar Kip Rupp, CFA, IRC - Investors FGS Global Quanta Services, Inc. (832) 640-7570 (713) 629-7600 Exhibit 99.1 PRESS RELEASE QUANTA SERVICES REPORTS FIRST QUARTER 2026 RESULTS First Quarter Consolidated Revenues of $7.9 Billion* First Quarter GAAP Diluted EPS of $1.45* and Adjusted Diluted EPS of $2.68* Net Income Attributable to Common Stock of $220.6 Million* Adjusted EBITDA of $686.4 Million* Cash Flow From Operations of $391.7 Mill ...