$CLH SEC Filings

Date of Report (Date of earliest event reported): October 28, 2026

Execution Version CLEAN HARBORS, INC., the GUARANTORS party hereto from time to time AND U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee 6.250% Senior Notes due 2034 INDENTURE Dated as of October 1, 2026

NORWELL, Mass. – September 17, 2026 – Clean Harbors, Inc. (“Clean Harbors” or the “Company”) (NYSE: CLH), announced today that it has priced a private offering of $600 million of senior notes due 2034 (the “notes”).

Sold 2,500 shares ($803K)

Gave up 564 shares to cover exercise price or tax ($164K)

Sold 1,000 shares ($293K)

Gave up 977 shares to cover exercise price or tax ($282K) · Returned 2,166 shares to the issuer

Sold 2,500 shares ($700K)

Gave up 447 shares to cover exercise price or tax ($130K)

Gave up 630 shares to cover exercise price or tax ($182K) · Returned 1,324 shares to the issuer

Sold 2,788 shares ($784K)

Gave up 1,032 shares to cover exercise price or tax ($300K)

Gave up 1,757 shares to cover exercise price or tax ($511K)

Sold 789 shares ($248K)