Underwood Rebecca 4

What Happened

• Rebecca Underwood, President & EVP — Facilities of Clean Harbors (CLH), had 311 shares withheld to satisfy tax withholding obligations related to vesting. The shares were valued at $290.74 each, totaling approximately $90,420. This was a withholding/disposition of shares, not an open-market sale or purchase.

Key Details

• Transaction date: 2026-07-01
• Price per share: $290.74; Shares withheld/disposed: 311; Total value: ~$90,420
• Filing date (Form 4): 2026-07-06 (see SEC filing for timeliness status)
• Post-transaction holdings: Not specified in this Form 4
• Footnote: F1 — Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b-3 (routine tax withholding)
• Transaction code: F (tax withholding), recorded as a disposition

Context

• This was a tax-withholding event tied to vested shares (a cashless withholding), which is routine and typically does not signal the insider’s view on the company’s prospects. It differs from an open-market sale because shares were retained by the company to cover taxes rather than sold on the market.