---
schema_version: "secwatch.filing_event.v1"
accession: "0000822818-23-000018"
form_type: "8-K"
ticker: "CLH"
cik: "0000822818"
company_name: "CLEAN HARBORS INC"
filed_at: "2023-03-16T23:59:59+00:00"
generated_at: "2026-06-18T01:21:18.896594+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Clean Harbors appoints former MA Lt. Gov. Karyn Polito to Board; two directors to retire

## Summary
- Karyn Polito appointed to Board effective March 16, 2023, expanding Board to 13 members.
- Polito served as MA Lt. Governor (2015-2023); will serve on Audit and Governance Committees.
- Edward Galante to be named Lead Independent Director.
- Dr. Eugene Banucci and Thomas Shields plan to retire and not stand for re-election at May 2023 annual meeting.

## SEC filing metadata
- accession: 0000822818-23-000018
- form_type: 8-K
- ticker: CLH
- cik: 0000822818
- company_name: CLEAN HARBORS INC
- filed_at: 2023-03-16T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/822818/000082281823000018/0000822818-23-000018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/822818/000082281823000018/clh-20230316.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000822818-23-000018
- JSON: https://secwatch.observer/filing/0000822818-23-000018.json
- Plain text: https://secwatch.observer/filing/0000822818-23-000018.txt

## Key facts
- Executive change
  Karyn Polito was appointed as Director at CLEAN HARBORS INC.
  - Action: appointed
  - Role: Director
  source text: On March 16, 2023, Clean Harbors, Inc. (the “Company”) announced the expansion of the Company’s Board of Directors (the "Board") from 12 to 13 members and the appointment of Karyn Polito to the Board effective as of March 16, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/822818/000082281823000018/0000822818-23-000018-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.