HARBOR AUDIOLOGY & HEARING SERVICES, INC.

of operations. Defined Contribution Plan The Company has defined contribution plans under which eligible employees may contribute up to the maximum amount as provided by law. The Company matches a portion of these employee contributions and contributed $ 31.5 million, $ 30.9 million and $ 28.8 million in 2025, 2024 and 2023 respectively. Advertising Expense Advertising costs are expensed as incurred. Advertising expense was $ 9.8 million in 2025, $ 11.4 million in 2024 and $ 10.9 million in 2023. Stock-based Compensation Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which generally represents the vesting period. In addition, the Company issues awards with performance targets

6,918 659,217 646,301 (32,299) (4.9) 12,916 2.0 Corporate 55,696 36,131 36,780 19,565 N/M (649) N/M Total 4,144,599 4,061,370 3,746,124 83,229 2.0 315,246 8.4 Selling, General and Administrative Expenses (3) : Environmental Services 387,529 371,263 346,791 16,266 4.4 24,472 7.1 Safety-Kleen Sustainability Solutions 72,989 78,575 78,089 (5,586) (7.1) 486 0.6 Corporate 255,781 261,810 225,578 (6,029) (2.3) 36,232 16.1 Total 716,299 711,648 650,458 4,651 0.7 61,190 9.4 Adjusted EBITDA: Environmental Services 1,343,776 1,267,462 1,101,608 76,314 6.0 165,854 15.1 Safety-Kleen Sustainability Solutions 137,454 147,006 172,873 (9,552) (6.5) (25,867) (15.0) Corporate (311,291) (297,534) (261,911) (13,757) (4.6) (35,623) (13.6) Total $ 1,169,939 $ 1,116,934 $ 1,012,570 $ 53,005 4.7% $ 104,364 10.3%

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