---
schema_version: "secwatch.filing_event.v1"
accession: "0000822818-21-000039"
form_type: "8-K"
ticker: "CLH"
cik: "0000822818"
company_name: "CLEAN HARBORS INC"
filed_at: "2021-08-04T23:59:59+00:00"
generated_at: "2026-06-29T22:54:28.484250+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Clean Harbors to acquire HydroChemPSC for $1.25B in cash

## Summary
- All-cash purchase price of $1.25 billion, subject to customary adjustments.
- HPC 2021E revenue ~$744M, adjusted EBITDA ~$115M.
- Clean Harbors anticipates $40M in cost synergies after first full year, implying 8.1x post-synergy multiple.
- Financing through cash on hand and debt; Goldman Sachs committed $1.0B term loan.
- Transaction expected to close later in 2021, pending regulatory approval.

## SEC filing metadata
- accession: 0000822818-21-000039
- form_type: 8-K
- ticker: CLH
- cik: 0000822818
- company_name: CLEAN HARBORS INC
- filed_at: 2021-08-04T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/822818/000082281821000039/0000822818-21-000039-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/822818/000082281821000039/clh-20210803.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000822818-21-000039
- JSON: https://secwatch.observer/filing/0000822818-21-000039.json
- Plain text: https://secwatch.observer/filing/0000822818-21-000039.txt

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