{"filing":{"accession_number":"0000822818-26-000027","cik":"0000822818","ticker":"CLH","company_name":"CLEAN HARBORS INC","form":"8-K","filing_date":"2026-05-20","report_date":null,"primary_document":"clh-20260519.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000027/clh-20260519.htm"},"events":[{"id":1067,"run_id":919,"accession_number":"0000822818-26-000027","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"summary":"Alan S. McKim, Executive Chairman and Chief Technology Officer, notified the Board on May 19, 2026 of his intention to retire from both the Board and his CTO role, effective upon appointment of a new Chairman. This departure of a senior executive holding dual leadership positions is material to investors as it affects the registrant's leadership and governance structure.","company_name":"CLEAN HARBORS INC","ticker":"CLH","filing_date":"2026-05-20","items":[{"id":438,"accession_number":"0000822818-26-000027","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Alan S. McKim, serving as Executive Chairman and Chief Technology Officer, notified the Board on May 19, 2026 of his intention to retire from both the Board and his CTO role, effective upon appointment of a new Chairman. This is a departure of a senior executive holding dual leadership positions. While the filing also mentions an anticipated appointment of an independent Chairman, the principal disclosed action centers on McKim's retirement, making exec_departure the most salient classification.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-21T02:39:16.591733+00:00","company_name":"","ticker":null,"filing_date":""},{"id":439,"accession_number":"0000822818-26-000027","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"The filing discloses the retirement of Mr. McKim, an executive whose departure is announced via press release. Retirement is a form of executive departure and is material to investors as it affects the registrant's leadership and governance structure. The announcement via press release on the filing date indicates this is a significant personnel change warranting disclosure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-21T02:39:16.591733+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":438,"accession_number":"0000822818-26-000027","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Alan S. McKim, serving as Executive Chairman and Chief Technology Officer, notified the Board on May 19, 2026 of his intention to retire from both the Board and his CTO role, effective upon appointment of a new Chairman. This is a departure of a senior executive holding dual leadership positions. While the filing also mentions an anticipated appointment of an independent Chairman, the principal disclosed action centers on McKim's retirement, making exec_departure the most salient classification.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-21T02:39:16.591733+00:00","company_name":"CLEAN HARBORS INC","ticker":"CLH","filing_date":"2026-05-20"},{"id":439,"accession_number":"0000822818-26-000027","item_number":"7.01","item_title":"Regulation FD Disclosure.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"The filing discloses the retirement of Mr. McKim, an executive whose departure is announced via press release. Retirement is a form of executive departure and is material to investors as it affects the registrant's leadership and governance structure. The announcement via press release on the filing date indicates this is a significant personnel change warranting disclosure.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-21T02:39:16.591733+00:00","company_name":"CLEAN HARBORS INC","ticker":"CLH","filing_date":"2026-05-20"}]}