Form 4 Filing for Clean Harbors Inc.

This Form 4 filing reports transactions by Sharon M. Gabriel, EVP/CIO of Clean Harbors Inc. On March 13, 2026, 727 shares of Common Stock were forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program, as indicated by footnote F2. Additionally, 1401 shares of Common Stock were disposed of, with a transaction code of "D", for a price of 0.0 per share. These forfeitures and dispositions resulted in a post-transaction share ownership of 21,065 shares for Mr. Gabriel. Another transaction on the same date involved the disposition of 727 shares of Common Stock, with a transaction price of 288.93 per share, noted under footnote F1 as payment of tax liability by withholding of securities incident to vesting. Following this transaction, Mr. Gabriel owns 22,466 shares.