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Clean Harbors (NYSE: CLH) EVP records tax withholding and share forfeiture

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Clean Harbors executive George L. Curtis reported routine share dispositions tied to compensation events. On March 13, 2026, 350 shares of Common Stock were withheld at $288.93 per share to satisfy tax obligations upon vesting. The same day, 1,028 restricted shares were returned to the company at $0.00 after performance targets under its Long Term Equity Incentive Program were not achieved. Following these transactions, Curtis directly holds 46,048 Common Stock shares, which include 11 shares acquired through the Clean Harbors Employee Stock Purchase Plan.

Positive

  • None.

Negative

  • None.

Insights

These are routine compensation-related share disposals with limited signaling value.

The filing shows George L. Curtis, an executive vice president at Clean Harbors, disposing of shares only through mechanisms tied to equity compensation. One transaction is a tax-withholding disposition of 350 shares at $288.93 upon vesting, a standard method to cover tax liabilities.

The second transaction is a disposition to the issuer of 1,028 restricted shares at $0.00, reflecting forfeiture because the company did not meet performance targets in its Long Term Equity Incentive Program. After these entries, Curtis directly holds 46,048 shares, indicating he retains a substantial equity stake and that the actions are largely administrative rather than directional trading.

Insider CURTIS GEORGE L
Role EXEC. VICE PRESIDENT (CHESI)
Type Security Shares Price Value
Tax Withholding Common Stock 350 $288.93 $101K
Disposition Common Stock 1,028 $0.00 --
Holdings After Transaction: Common Stock — 47,065 shares (Direct)
Footnotes (1)
  1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3. Shares of restricted stock forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program. Includes 11 shares acquired under the Clean Harbors Employee Stock Purchase Plan
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
CURTIS GEORGE L
(Last) (First) (Middle)
C/O CLEAN HARBORS, INC.
42 LONGWATER DRIVE
(Street)
NORWELL MA 02061
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
CLEAN HARBORS INC [ CLH ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
EXEC. VICE PRESIDENT (CHESI)
3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 03/13/2026 F 350(1) D $288.93 47,065 D
Common Stock 03/13/2026 D 1,028(2) D $0 46,048(3) D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3.
2. Shares of restricted stock forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program.
3. Includes 11 shares acquired under the Clean Harbors Employee Stock Purchase Plan
/s/ George L. Curtis 03/17/2026
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Clean Harbors (CLH) executive George L. Curtis report?

George L. Curtis reported two dispositions of Clean Harbors Common Stock. One was 350 shares withheld for taxes at $288.93 per share, and another was 1,028 restricted shares forfeited to the company after performance targets under its long-term equity incentive plan were not met.

Were the Clean Harbors (CLH) insider transactions open-market sales or routine events?

The transactions were routine compensation-related events, not open-market sales. One involved shares withheld to satisfy tax liabilities at vesting, and the other reflected forfeiture of restricted shares back to the issuer because company performance targets under a long-term incentive program were not achieved.

How many Clean Harbors (CLH) shares does George L. Curtis hold after these Form 4 transactions?

After the reported transactions, George L. Curtis directly holds 46,048 shares of Clean Harbors Common Stock. This total includes 11 shares acquired through the Clean Harbors Employee Stock Purchase Plan, as indicated in the filing’s footnotes on beneficial holdings.

What does the tax-withholding disposition reported by Clean Harbors (CLH) executive mean?

The tax-withholding disposition reflects 350 shares withheld at $288.93 per share to pay income taxes when equity awards vested. Instead of paying cash taxes, shares are surrendered, a common practice in stock-based compensation programs for senior executives and employees.

Why were some of George L. Curtis’s Clean Harbors (CLH) restricted shares forfeited?

The filing explains that 1,028 shares of restricted stock were forfeited because Clean Harbors did not achieve required performance targets under its Long Term Equity Incentive Program. When such performance goals are missed, the related unearned restricted shares are returned to the company without consideration.

Does this Clean Harbors (CLH) Form 4 indicate a change in insider sentiment?

The Form 4 does not show discretionary buying or selling in the market. Both transactions are mechanical compensation adjustments: tax withholding upon vesting and forfeiture of unearned performance-based restricted stock. Curtis still holds a sizable share position, suggesting no directional trading signal here.