Clean Harbors Issues $600M Senior Notes to Fund Acquisitions

Overview of Filing

On October 1, 2026, Clean Harbors, Inc. (NYSE: CLH) issued $600.0 million aggregate principal amount of 6.250% senior notes due 2034 under an indenture with U.S. Bank Trust Company, National Association as trustee.

Use of Proceeds & M&A Activity

• EnviroServe Acquisition: The company allocated $470 million of the net offering proceeds to finance the purchase price of EnviroServe, which closed on October 2, 2026.
• ES&H Acquisition Debt Paydown: The remainder of the proceeds will repay borrowings drawn under Clean Harbors' revolving credit facility that were used to partially fund the acquisition of ES&H, which closed on September 18, 2026.

Key Terms of the Notes

• Maturity: September 30, 2034
• Interest Rate: 6.250% per annum, payable semi-annually on March 31 and September 30, beginning March 31, 2027.
• Ranking: Senior unsecured obligations, guaranteed on a senior unsecured basis by substantially all domestic subsidiaries.
• Optional Redemption: Redeemable prior to September 30, 2029, at par plus a make-whole premium (or up to 40% with equity offering proceeds at 106.250%). Redeemable at specified fixed redemption prices on or after September 30, 2029.