POST-TENSION SERVICES OF OKLAHOMA, LLC

a percentage of compensation that a participant contributes to the Plan in amounts defined by the terms of the Plan. Effective January 1, 2018, eligibility for Company safe harbor matching contributions for eligible employees hired on or after January 1, 2018 generally begins on the first month following one year of service. Company contributions made on or after January 1, 2018 and earnings thereon generally vest 100 % upon eligibility, except for individuals subject to certain collective bargaining agreements. For contributions made prior to January 1, 2018, Company contributions and earnings thereon vest at a rate of 25 % for each year of credited service for most participants, but the vesting schedule differs for certain participant groups. Employees of certain Company production facil

For contributions made prior to January 1, 2018, Company contributions and earnings thereon vest at a rate of 25 % for each year of credited service for most participants, but the vesting schedule differs for certain participant groups. Employees of certain Company production facilities, who are subject to a collective bargaining agreement, are subject to different pre-tax limits and matching contribution levels. In addition, certain production employees receive non-matching Company contributions. Investment Options All contributions are deposited by the Company in trust funds held by Vanguard Fiduciary Trust Company (“Vanguard”) or any successor trustee as may be selected by the EBTC. The values of the trust funds change according to increases or decreases in the values of the investments

le U.S. employees who are not provided retirement benefits through a collective bargaining agreement may make contributions through payroll deductions and to which we make certain matching contributions. Ethics and Compliance All of our employees are subject to Quanta’s Code of Conduct, which addresses compliance with applicable laws and Quanta’s policies concerning, among other things, general business ethics, competition, anti-corruption and bribery, environmental protection, conflicts of interest, harassment and discrimination, data security and privacy, and insider trading. Quanta’s Code of Conduct also informs employees and third parties (such as suppliers, subcontractors and members of the public) about the resources and confidential reporting mechanisms available to detect, prevent

law. Quanta may also make discretionary employer contributions to such plan. Matching contributions vest immediately, and discretionary employer contributions may be subject to a vesting schedule determined at the time of the contribution, provided that vesting accelerates upon a change in control or the participant’s death or retirement. All matching and discretionary employer contributions, whether vested or not, are forfeited upon a participant’s termination of employment for cause or upon the participant engaging in competition with Quanta or any of its affiliates. As of December 31, 2025 and 2024, the liability related to deferred cash compensation under these plans, including amounts contributed by Quanta, was $ 126.1 million and $ 110.2 million, the majority of which was included i

2 20.1 % Gross profit 4,275,081 15.0 3,510,761 14.8 764,320 21.8 % Equity in earnings of integral unconsolidated affiliates 55,635 0.2 50,484 0.2 5,151 10.2 % Selling, general and administrative expenses (2,189,209) (7.7) (1,824,754) (7.7) (364,455) 20.0 % Amortization of intangible assets (498,795) (1.7) (382,959) (1.6) (115,836) 30.2 % Increase in fair value of contingent consideration liabilities (31,203) (0.1) (7,064) — (24,139) 341.7 % Operating income 1,611,509 5.7 1,346,468 5.7 265,041 19.7 % Interest and other financing expenses (261,445) (1.0) (202,687) (0.9) (58,758) 29.0 % Interest income 15,702 0.1 32,404 0.1 (16,702) (51.5) % Other income, net 23,739 0.1 35,845 0.2 (12,106) (33.8) % Income before income taxes 1,389,505 4.9 1,212,030 5.1 177,475 14.6 % Provision for income taxe