Clean Harbors EVP/CIO Sharon Gabriel Tax Liability Payment via Stock Withholding

This Form 4 filing reports that Sharon M. Gabriel, Executive Vice President and Chief Information Officer of Clean Harbors Inc., disposed of 359 shares of common stock on July 1, 2026, at a price of $290.74 per share. The transaction was coded as "F" and involved a disposition ("D") of shares. According to Footnote F1, this transaction represents payment of tax liability through withholding of securities incident to the vesting of securities in accordance with Rule 16b-3. Following this transaction, Gabriel owns 20,706 shares of Clean Harbors common stock. The filing indicates this was an indirect ownership transaction. The form was signed on July 6, 2026, and covers the reporting period ending July 1, 2026.