Clean Harbors Prices $600M Offering of 6.250% Senior Notes Due 2034 to Fund Acquisitions

Event Overview

On September 17, 2026, Clean Harbors, Inc. (NYSE: CLH) commenced and priced a private offering of $600 million aggregate principal amount of senior notes due 2034 under Rule 144A and Regulation S under the Securities Act of 1933.

Key Terms of the Offering

• Principal Amount: $600,000,000
• Interest Rate: 6.250% per annum
• Offering Price: 100.000% of aggregate principal amount
• Maturity Date: 2034
• Anticipated Closing Date: October 1, 2026, subject to customary closing conditions

Use of Proceeds

The net proceeds from the offering will be deployed to:

1. Finance the purchase price of the previously announced acquisition of EnviroServe, a national provider of environmental and waste management services.
2. Repay borrowings under the Company's revolving credit facility that were drawn to partially finance the previously announced acquisition of ES&H.
3. General corporate purposes in the event that either transaction fails to close.

Strategic & Capital Structure Implications

• M&A Execution: The offering secures long-term fixed-rate financing to support strategic inorganic growth through the EnviroServe and ES&H transactions without diluting common equity holders.
• Liquidity & Debt Profile: Refinancing revolver borrowings extends debt maturities out to 2034 and restores revolving credit capacity for ongoing operational and liquidity needs.