Quanta Services, Inc.

Item 5.07 Submission of Matters to a Vote of Security Holders. (a)  On May 21, 2026, Quanta Services, Inc. (the “Company” or “Quanta”) held its 2026 Annual Meeting of Stockholders. (b)  The final voting results for the items that were presented for stockholder approval, recommendation or ratification at the annual meeting are set forth below. These items related to each proposal described in detail in Quanta’s definitive proxy statement for the 2026 Annual Meeting of Stockholders, which was filed with the U.S. Securities and Exchange Commission on April 10, 2026 (the “2026 Proxy Statement”). All results presented below reflect the voting power of the Company’s common stock. Election of Directors (Item 1) The following ten director nominees were elected as directors of the Company to serve one-year terms expiring at the 2027 Annual Meeting of Stockholders. The vote totals for each director, rounded to the nearest whole share, are set forth in the table below: Nominee: Number of Number of Votes Withhold / Broker Votes Cast For Cast Against Abstentions Non-Votes ─────────────────────────────────────────────────────────────────────────────────────────────────────── Earl C. Austin, Jr. 121,035,028 481,029 57,777 11,807,033 Warner L. Baxter 119,732,272 1,600,979 240,583 11,807,033 Doyle N. Beneby 118,416,075 3,093,186 64,573 11,807,033 Bernard Fried 116,964,232 4,237,535 372,067 11,807,033 Worthing F. Jackman 106,953,127 14,239,457 381,249 11,807,033 Joseph Kim 121,230,587 279,793 63,454 11,807,033 Holli C. Ladhani 121,354,250 153,836 65,748 11,807,033 Jo-ann M. dePass Oslovsky 121,206,221 305,528 62,085 11,807,033 R. Scott Rowe 118,160,620 3,172,592 240,622 11,807,033 Martha B. Wyrsch 118,718,836 2,790,359 64,639 11,807,033 Advisory Vote on Executive Compensation (Item 2) The advisory resolution approving the Company’s executive compensation as set forth in the 2026 Proxy Statement was approved with the vote totals, rounded to the nearest whole share, as set forth in the table below: Number of Number of Withhold / Abstentions Broker Non-Votes Votes Cast For Votes Cast Against ──────────────────────────────────────────────────────────────────────────────────────────── 114,220,186 7,122,529 231,119 11,807,033 Ratification of Appointment of Independent Registered Public Accounting Firm (Item 3) The appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal year 2026 was ratified with the vote totals, rounded to the nearest whole share, as set forth in the table below: Number of Number of Withhold /Abstentions Broker Non-Votes Votes Cast For Votes Cast Against ─────────────────────────────────────────────────────────────────────────────────────────── 125,199,372 8,114,219 67,276 —

Item 8.01 Other Events On May 22, 2026, Quanta issued a press release announcing the election of Joseph Kim, a new independent director, to the Board of Directors at its 2026 Annual Meeting of Stockholders. On May 22, 2026, the Company also announced that the Board authorized a new stock repurchase program. The new repurchase program, which was effective as of May 21, 2026, authorizes the Company to purchase, from time to time up to $1.0 billion of its outstanding common stock. Repurchases may be implemented through open-market or privately negotiated transactions, at management’s discretion, based on market and business conditions, applicable contractual and legal requirements and other factors. Quanta is not obligated to acquire any specific amount of common stock, and the Board may modify or terminate the new repurchase program at any time at its sole discretion and without notice. Copies of the press releases are attached to this Current Report on Form 8-K as Exhibit 99.1 and Exhibit 99.2 and are incorporated herein by reference.