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SEGMENT REPORTING (Tables) | 9 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Reconciliation of Third Party Revenues to Direct Revenues | The following tables reconcile third-party revenues to direct revenues by reportable segment (in thousands):
| For the Three Months Ended September 30, 2025
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Segment Revenues |  | Corporate |  | Total Consolidated Revenues
Third-party revenues | $ | 1,318,580 |  |  | $ | 230,757 |  |  | $ | 1,549,337 |  |  | $ | — |  |  | $ | 1,549,337 |
Intersegment revenues (expense), net | 12,720 |  |  | (12,720) |  |  | — |  |  | — |  |  | — |
Direct revenues | $ | 1,331,300 |  |  | $ | 218,037 |  |  | $ | 1,549,337 |  |  | $ | — |  |  | $ | 1,549,337 |
| For the Three Months Ended September 30, 2024
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Segment Revenues |  | Corporate |  | Total Consolidated Revenues
Third-party revenues | $ | 1,287,650 |  |  | $ | 241,676 |  |  | $ | 1,529,326 |  |  | $ | 96 |  |  | $ | 1,529,422 |
Intersegment revenues (expense), net | 9,537 |  |  | (9,537) |  |  | — |  |  | — |  |  | — |
Direct revenues | $ | 1,297,187 |  |  | $ | 232,139 |  |  | $ | 1,529,326 |  |  | $ | 96 |  |  | $ | 1,529,422 |
| For the Nine Months Ended September 30, 2025
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Segment Revenues |  | Corporate |  | Total Consolidated Revenues
Third-party revenues | $ | 3,855,677 |  |  | $ | 675,278 |  |  | $ | 4,530,955 |  |  | $ | 186 |  |  | $ | 4,531,141 |
Intersegment revenues (expense), net | 36,771 |  |  | (36,771) |  |  | — |  |  | — |  |  | — |
Direct revenues | $ | 3,892,448 |  |  | $ | 638,507 |  |  | $ | 4,530,955 |  |  | $ | 186 |  |  | $ | 4,531,141 |
| For the Nine Months Ended September 30, 2024
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Segment Revenues |  | Corporate |  | Total Consolidated Revenues
Third-party revenues | $ | 3,746,227 |  |  | $ | 712,312 |  |  | $ | 4,458,539 |  |  | $ | 297 |  |  | $ | 4,458,836 |
Intersegment revenues (expense), net | 32,853 |  |  | (32,853) |  |  | — |  |  | — |  |  | — |
Direct revenues | $ | 3,779,080 |  |  | $ | 679,459 |  |  | $ | 4,458,539 |  |  | $ | 297 |  |  | $ | 4,458,836 |
Schedule of Reconciliation to Consolidated Statements of Income to Adjusted EBITDA | The tables below present total Reportable Segment Adjusted EBITDA and the relevant significant segment expenses provided to the CODM by reported segment (in thousands):
| For the Three Months Ended September 30, 2025
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Reportable Segments |  |  |  |
Direct Revenues | $ | 1,331,300 |  |  | $ | 218,037 |  |  | $ | 1,549,337 |  |  |  |  |
Cost of Revenues | 871,487 |  |  | 158,545 |  |  | 1,030,032 |  |  |  |  |
Selling, General and Administrative Expenses | 102,584 |  |  | 18,555 |  |  | 121,139 |  |  |  |  |
Total Reportable Segment Adjusted EBITDA | $ | 357,229 |  |  | $ | 40,937 |  |  | $ | 398,166 |  |  |  |  |
| For the Three Months Ended September 30, 2024
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Reportable Segments |  |  |  |
Direct Revenues | $ | 1,297,187 |  |  | $ | 232,139 |  |  | $ | 1,529,326 |  |  |  |  |
Cost of Revenues | 874,414 |  |  | 171,120 |  |  | 1,045,534 |  |  |  |  |
Selling, General and Administrative Expenses | 90,271 |  |  | 19,793 |  |  | 110,064 |  |  |  |  |
Total Reportable Segment Adjusted EBITDA | $ | 332,502 |  |  | $ | 41,226 |  |  | $ | 373,728 |  |  |  |  |
| For the Nine Months Ended September 30, 2025 |  |
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Reportable Segments |  |  |  |  |  |
Direct Revenues | $ | 3,892,448 |  |  | $ | 638,507 |  |  | $ | 4,530,955 |  |  |  |  |  |  |
Cost of Revenues | 2,592,300 |  |  | 476,550 |  |  | 3,068,850 |  |  |  |  |  |  |
Selling, General and Administrative Expenses | 292,134 |  |  | 54,455 |  |  | 346,589 |  |  |  |  |  |  |
Total Reportable Segment Adjusted EBITDA | $ | 1,008,014 |  |  | $ | 107,502 |  |  | $ | 1,115,516 |  |  |  |  |  |  |
| For the Nine Months Ended September 30, 2024
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total Reportable Segments |  |  |  |
Direct Revenues | $ | 3,779,080 |  |  | $ | 679,459 |  |  | $ | 4,458,539 |  |  |  |  |
Cost of Revenues | 2,541,017 |  |  | 496,441 |  |  | 3,037,458 |  |  |  |  |
Selling, General and Administrative Expenses | 281,171 |  |  | 60,616 |  |  | 341,787 |  |  |  |  |
Total Reportable Segment Adjusted EBITDA | $ | 956,892 |  |  | $ | 122,402 |  |  | $ | 1,079,294 |  |  |  |  |
The following table presents Total Reportable Segment Adjusted EBITDA reconciled to income from operations before provision for income taxes (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Adjusted EBITDA: |  |  |  |  |  |  |
Environmental Services | $ | 357,229 |  |  | $ | 332,502 |  |  | $ | 1,008,014 |  |  | $ | 956,892 |
Safety-Kleen Sustainability Solutions | 40,937 |  |  | 41,226 |  |  | 107,502 |  |  | 122,402 |
Total Reportable Segment Adjusted EBITDA | 398,166 |  |  | 373,728 |  |  | 1,115,516 |  |  | 1,079,294 |
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |
Corporate Costs(1) | 78,007 |  |  | 71,914 |  |  | 224,266 |  |  | 219,569 |
Accretion of environmental liabilities | 3,499 |  |  | 3,618 |  |  | 10,710 |  |  | 10,139 |
Stock-based compensation | 8,922 |  |  | 5,837 |  |  | 22,620 |  |  | 20,690 |
Depreciation and amortization | 114,729 |  |  | 100,063 |  |  | 342,994 |  |  | 295,632 |
Income from operations | 193,009 |  |  | 192,296 |  |  | 514,926 |  |  | 533,264 |
Other (income) expense, net | (3,517) |  |  | 1,123 |  |  | (1,982) |  |  | 2,431 |
Interest expense, net of interest income | 35,700 |  |  | 35,779 |  |  | 108,883 |  |  | 100,767 |
Income from operations before provision for income taxes | $ | 160,826 |  |  | $ | 155,394 |  |  | $ | 408,025 |  |  | $ | 430,066 |
________________ (1) Corporate Costs include certain revenue, cost of revenues and selling, general and administrative expenses not managed through the Company’s operating segments. These costs are not captured within the Company’s Reportable Segment Adjusted EBITDA, but are included in the Company’s total Adjusted EBITDA balances.

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