Clean Harbors (CLH) EVP Curtis reports 249-share tax withholding at $259.91

Rhea-AI Filing Summary

CLEAN HARBORS INC executive George L. Curtis reported a small share withholding to cover taxes. On February 2, 2026, 249 shares of Common Stock were withheld at $259.91 per share, coded as an F transaction.

This withholding satisfied tax liability related to vesting of securities in accordance with Rule 16b-3. After this transaction, Curtis directly beneficially owned 47,415 shares of Clean Harbors common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider CURTIS GEORGE L

Role EXEC. VICE PRESIDENT (CHESI)

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	249	$259.91	$65K

Holdings After Transaction: Common Stock — 47,415 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^*

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)
02/02/2026

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	02/02/2026		F		249(1)	D	$259.91	47,415	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/ George L. Curtis	02/03/2026
	** 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 George L. Curtis report at CLEAN HARBORS INC (CLH)?

George L. Curtis reported a tax-related share withholding at CLEAN HARBORS INC. On February 2, 2026, 249 shares of common stock were withheld at $259.91 per share to satisfy tax liability associated with the vesting of securities under Rule 16b-3.

How many CLEAN HARBORS (CLH) shares were withheld and at what price?

A total of 249 shares of CLEAN HARBORS common stock were withheld. The Form 4 shows these shares valued at $259.91 per share, reflecting the amount used to cover the reporting person’s tax liability upon vesting of previously granted securities.

What does transaction code "F" mean in the George L. Curtis Form 4 for CLH?

Transaction code “F” on this Form 4 indicates a tax withholding transaction. The filing specifies that 249 shares were withheld to pay tax liability incident to the vesting of securities, consistent with Rule 16b-3 treatment for equity-based compensation events.

How many CLEAN HARBORS (CLH) shares does George L. Curtis own after this transaction?

Following the reported transaction, George L. Curtis beneficially owns 47,415 shares of CLEAN HARBORS common stock. The Form 4 characterizes this ownership as direct, reflecting his position after the 249-share tax withholding on February 2, 2026.

What is George L. Curtis’s role at CLEAN HARBORS INC (CLH)?

George L. Curtis is identified as an officer of CLEAN HARBORS INC. The filing lists his title as Executive Vice President (CHESI), and confirms he is not a director or a ten percent owner of the company’s outstanding securities.

How is Rule 16b-3 referenced in this CLEAN HARBORS (CLH) Form 4?

The Form 4 footnote explains that the 249-share withholding represents payment of tax liability by withholding securities. It states this occurs incident to vesting of securities in accordance with Rule 16b-3, which governs certain insider transactions in equity compensation contexts.