Clean Harbors — May 6, 2026 release

An itemized reconciliation between reported GAAP net cash from operating activities and adjusted free cash flow is as follows (in thousands): Three Months Ended March 31, 2026 March 31, 2025 Net cash from operating activities $ 6,297  $ 1,605  Additions to property, plant and equipment (98,443) (118,695) Cash investments in strategic growth projects 14,787  —  Proceeds from sale and disposal of fixed assets 1,522  1,343  Adjusted free cash flow $ (75,837) $ (115,747) Adjusted EBITDA Guidance Reconciliation An itemized reconciliation between projected GAAP net income and projected Adjusted EBITDA is as follows (in millions): For the Year Ending December 31, 2026 Projected GAAP net income $421 to $472 Adjustments: Accretion of environmental liabilities 16 to 15 Stock-based compensation 41 to 44 Depreciation and amortization 470 to 460 Interest expense, net 144 to 139 Provision for income taxes 148 to 170 Projected Adjusted EBITDA $1,240 to $1,300 Adjusted Free Cash Flow Guidance Reconciliation An itemized reconciliation between projected GAAP net cash from operating activities and projected adjusted free cash flow is as follows (in millions). The Company excludes significant strategic growth investments, Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com which the Company expects to realize future long-term benefits from, as they are not indicative of free cash flow generation for the current period. For the Year Ending December 31, 2026 Projected net cash from operating activities $840 to $960 Additions to property, plant and equipment (475) to (535) Cash investments in strategic growth projects 110 to 110 Proceeds from sale and disposal of fixed assets 15 to 15 Projected adjusted free cash flow $490 to $550 Conference Call Information Clean Harbors will conduct a conference call for investors today at 9:0