Founder Alan S. McKim to retire as Executive Chairman and CTO of Clean Harbors

CLEAN HARBORS INC

Founder, Executive Chairman & CTO Alan S. McKim retiring from Board and officer role upon appointment of new Chair, expected summer 2026.
McKim founded Clean Harbors in 1980, served as CEO until 2023; retirement is not due to any disagreement with the Company.
Board plans to appoint an independent Chair later this summer as part of planned leadership transition; Co-CEOs Battles and Gerstenberg continue.
Under McKim's leadership, Clean Harbors grew to $6B+ revenue, nearly 25,000 employees, 20,000+ vehicles, 900+ service branches.

item 5.02 item 7.01 item 9.01

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Departed

Alan S. McKim

Executive Chairman and Chief Technology Officer

CLH · CLEAN HARBORS INC

Filed: May 20, 2026, 4:34 PM ET

On May 19, 2026, Alan S. McKim, serving in the capacities of Executive Chairman of the Board of Directors (the “Board”) and Chief Technology Officer, notified the Board of his intention to retire from the Board and his role as Chief Technology Officer, effective upon the Board’s appointment of a new Chairman.

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Executive change SEC 8-K Item 5.02 confidence 0.95

Alan S. McKim departed as Executive Chairman and Chief Technology Officer at CLEAN HARBORS INC.

Action: retire
Role: Executive Chairman and Chief Technology Officer

Exact text from the filing

On May 19, 2026, Alan S. McKim, serving in the capacities of Executive Chairman of the Board of Directors (the “Board”) and Chief Technology Officer, notified the Board of his intention to retire from the Board and his role as Chief Technology Officer, effective upon the Board’s appointment of a new Chairman.

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Source: SEC EDGAR

accession 0000822818-26-000027

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