---
schema_version: "secwatch.filing_event.v1"
accession: "0000822818-26-000037"
form_type: "8-K"
ticker: "CLH"
cik: "0000822818"
company_name: "CLEAN HARBORS INC"
filed_at: "2026-08-12T16:26:33+00:00"
generated_at: "2026-08-12T16:27:06.004544+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Clean Harbors acquires EnviroServe for $470M; $25M synergies targeted

## Summary
- Deal valued at $470M cash; expected close H2 2026, subject to regulatory approval.
- EnviroServe: ~$250M revenue, ~$27M adjusted EBITDA, 40 locations, 2,500 customers, 700+ employees.
- Clean Harbors expects $25M cost synergies over two years, post-synergy multiple ~9x EBITDA.
- Acquisition funded via available cash and additional debt; seller is One Rock Capital Partners.
- EnviroServe has 85% recurring revenue; top 10 customer tenure exceeds 16 years; sub-1.0 TRIR safety record.

## SEC filing metadata
- accession: 0000822818-26-000037
- form_type: 8-K
- ticker: CLH
- cik: 0000822818
- company_name: CLEAN HARBORS INC
- filed_at: 2026-08-12T16:26:33+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/822818/000082281826000037/0000822818-26-000037-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/822818/000082281826000037/clh-20260812.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000822818-26-000037
- JSON: https://secwatch.observer/filing/0000822818-26-000037.json
- Plain text: https://secwatch.observer/filing/0000822818-26-000037.txt

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