secwatch.observer — SEC 8-K summary
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Issuer:     CLEAN HARBORS INC (CLH)
CIK:        0000822818
Form:       8-K
Filed at:   2026-05-20T20:34:52+00:00
Accession:  0000822818-26-000027
Event type: leadership
Sentiment:  neutral
Materiality: 0.70
Item codes: 5.02, 7.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

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

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/822818/000082281826000027/0000822818-26-000027-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/822818/000082281826000027/clh-20260519.htm
  HTML page:      https://secwatch.observer/filing/0000822818-26-000027

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer