Clean Harbors: Results Of Operations And Financial Condition, Regulation Fd Disclosure, Financial Statements And Exhibits

Item 2.02 Results of Operations and Financial ConditionOn October 28, 2026, Clean Harbors, Inc. (the “Company”) issued a press release announcing the Company’s results of operations for the third quarter ended September 30, 2026. A copy of that press release is furnished with this report as Exhibit 99.1.Item 7.01 Regulation FD DisclosureOn October 28, 2026, the Company issued a press release announcing an executive leadership transition. A copy of the press release is furnished as Exhibit 99.2.Item 9.01 Financial Statements and Exhibits(d) Exhibits. The following exhibits are being furnished herewith:Exhibit No.Description99.1Press Release of the Company dated October 28, 2026 Announcing Results of Operations for the third quarter ended September 30, 202699.2Press Release of the Company dated October 28, 2026 Announcing Executive Leadership Transition104The cover page from this Current Report on Form 8-K, formatted in iXBRL (Inline eXtensible Business Reporting Language)1SIGNATURES Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.Clean Harbors, Inc.(Registrant)October 28, 2026/s/ Eric J. DugasExecutive Vice President and Chief Financial Officer2

Clean Harbors: Results Of Operations And Financial Condition, Regulation Fd Disclosure, Financial Statements And Exhibits

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