Form 4: Clean Harbors Executive Sells Shares for Tax

Clean Harbors President & EVP Facilities, Rebecca Underwood, disposed of 51 shares of common stock to cover tax liabilities related to vesting securities.

Summary

• Rebecca Underwood, President & EVP Facilities of Clean Harbors Inc. (CLH), reported a disposition of company common stock.
• The transaction involved 51 shares of common stock.
• The shares were disposed of on December 15, 2025, at a price of $240.71 per share.
• This disposition was for the payment of tax liability by withholding of securities incident to the vesting of securities, in accordance with Rule 16b-3.
• Following this transaction, Rebecca Underwood beneficially owns 17,284 shares of Clean Harbors Inc. common stock.
• The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 5

Explanation: The filing reports a routine insider transaction for tax purposes, which is a neutral event and does not indicate any significant positive or negative sentiment regarding the company's performance or prospects.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Industry Context

This is a routine insider transaction related to executive compensation and tax obligations, which is common across all industries for publicly traded companies when restricted stock units or other equity awards vest.

Stakeholder Impact

• Shareholders: Minimal impact as this is a routine, small-scale transaction for tax purposes by an executive, not indicative of a change in company fundamentals or executive confidence.

Key Dates

Keywords

Clean Harbors, CLH, Form 4, Insider Transaction, Rebecca Underwood, Stock Disposition, Tax Withholding, Executive Compensation