CLEAN HARBORS INC (CLH): Entry into a Material Definitive Agreement

Clean Harbors issued $600M in 6.250% senior notes due 2034. Proceeds will fund the EnviroServe acquisition and repay revolver borrowings from the ES&H acquisition. The notes include customary covenants and redemption options.

One Rock Capital Partners sold EnviroServe Inc. to Clean Harbors, Inc. (CLH) for $470 million. EnviroServe offers environmental and waste management services. CLH's Co-CEO Mike Battles noted EnviroServe's growth and capabilities. One Rock expanded EnviroServe during its ownership. The transaction was previously announced and has now been completed.

One Rock Capital Partners sold EnviroServe and related affiliates to Clean Harbors (CLH) for $470 million. EnviroServe provides environmental and waste management services. Both companies expressed optimism about the deal's potential for growth and integration.

Clean Harbors, Inc. (CLH) completed the acquisitions of EnviroServe and ES&H for $775M, funded with cash and $600M in senior notes. The deals are expected to add $340M in revenue and $87M in post-synergy Adjusted EBITDA, with an 8.9x multiple.

Clean Harbors (CLH) issued $600M in senior notes at 6.250% interest to fund acquisitions. $470M will finance EnviroServe's purchase, expected to close in 2H 2026, with $25M in cost synergies. The rest will repay debt from the ES&H acquisition. Management expects revenue and synergy benefits, but debt risks include higher interest costs and execution uncertainty.

CLEAN HARBORS INC (CLH) filed an SEC Form 8-K — Other Events. EXHIBIT 99.1 Press Release Clean Harbors Announces $600 Million Senior Notes Offering NORWELL, Mass. – September 17, 2026 – Clean Harbors, Inc. (“Clean Harbors” or the “Company”) (NYSE: CLH), announced today that it is commencing a private offering of $600 million of senior notes