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SEGMENT REPORTING (Tables)

9 Months Ended

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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- Definition

Schedule Of Reconciliation Of Net Income To Adjusted Earnings Before Interest Tax Depreciation And Amortization Consolidated

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Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

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