George L. Curtis, Executive Vice President (CHESI) of Clean Harbors Inc., filed a Form 4 on August 11, 2026, disclosing a share withholding transaction dated July 1, 2026, related to the vesting of equity securities.

Key Highlights

  • Reporting person: George L. Curtis, Executive Vice President (CHESI) at Clean Harbors Inc. (NYSE:CLH)
  • Transaction date: July 1, 2026, with the form filed August 11, 2026
  • Shares withheld: 1,757 shares of Common Stock disposed of (code F) at a price of $290.74 per share
  • Purpose of transaction: Payment of tax liability by withholding of securities incident to vesting, in accordance with Rule 16b-3
  • Beneficial ownership following transaction: 44,291 shares of Common Stock held directly

George Curtis Reports Tax Withholding on Vested Shares at Clean Harbors

According to the filing, George L. Curtis, who serves as Executive Vice President (CHESI) of Clean Harbors Inc. (NYSE:CLH), reported a single non-derivative securities transaction in Table I. On July 1, 2026, a total of 1,757 shares of Common Stock were disposed of under transaction code F at a price of $290.74 per share. The filing's footnote states that this transaction represented the "payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3."

Following the reported transaction, Curtis held 44,291 shares of Common Stock directly, as disclosed in the filing. No derivative securities transactions were reported in Table II, and the filing indicates that Curtis filed individually rather than as part of a group. The form was signed by George L. Curtis and dated August 11, 2026, the same date as the filing.

The filing lists Curtis's address as c/o Clean Harbors, Inc., 42 Longwater Drive, Norwell, Massachusetts 02061. No amendment date was indicated, suggesting this is an original filing. The earliest transaction date reported is July 1, 2026.

What Was Disclosed

The filing disclosed one share withholding transaction by Clean Harbors EVP George L. Curtis on July 1, 2026, in which 1,757 shares of Common Stock were withheld at $290.74 per share to cover tax obligations arising from a securities vesting event, leaving Curtis with 44,291 directly held shares.