Clean Harbors (CLH) EVP/CIO reports 525-share tax withholding in Form 4

Rhea-AI Filing Summary

Clean Harbors Inc. executive EVP/CIO (CHESI) reported a routine insider transaction involving company common stock. On 01/02/2026, 525 shares of Clean Harbors common stock were withheld at a price of $234.48 per share, coded as an “F” transaction, which indicates shares were withheld to cover tax liabilities upon vesting of equity awards rather than sold in the open market. After this withholding, the reporting person beneficially owned 27,241 shares directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Gabriel Sharon M.

Role EVP/CIO (CHESI)

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	525	$234.48	$123K

Holdings After Transaction: Common Stock — 27,241 shares (Direct)

Footnotes (1)

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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^*

Gabriel Sharon M.

(Last) (First) (Middle)

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)
	EVP/CIO (CHESI)

3. Date of Earliest Transaction (Month/Day/Year)
01/02/2026

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	01/02/2026		F		525(1)	D	$234.48	27,241	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

	/s/ Sharon M. Gabriel	01/05/2026
	** 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.

FAQ

What insider transaction did Clean Harbors (CLH) report in this Form 4?

The EVP/CIO (CHESI) reported an “F” code transaction on 01/02/2026 in which 525 shares of Clean Harbors common stock were withheld to cover tax liabilities related to vesting equity.

How many Clean Harbors (CLH) shares were involved in the reported transaction?

The filing shows 525 shares of Clean Harbors common stock were withheld in the transaction, at a price of $234.48 per share.

What does the transaction code “F” mean in this Clean Harbors (CLH) Form 4?

The “F” code indicates a payment of tax liability by withholding of securities incident to the vesting of securities in accordance with Rule 16b-3, not an open-market sale.

How many Clean Harbors (CLH) shares does the executive own after this transaction?

Following the reported tax-withholding transaction, the executive beneficially owned 27,241 shares of Clean Harbors common stock directly.

Is this Clean Harbors (CLH) Form 4 filed by one reporting person or multiple?

The form is filed by one reporting person, as indicated by the checked line for “Form filed by One Reporting Person.”

What is the executive’s role at Clean Harbors (CLH) in this filing?

The reporting person is an officer of Clean Harbors, serving as EVP/CIO (CHESI).