Clean Harbors (CLH) EVP George Curtis has 1,757 shares withheld for taxes

Rhea-AI Filing Summary

Clean Harbors Inc. executive George L. Curtis, Executive Vice President (CHESI), reported a Form 4 transaction involving company common stock. On July 1, 2026, 1,757 shares were withheld to pay tax liability associated with vesting of equity awards, at a price of $290.74 per share. After this withholding, Curtis directly held 44,291 shares of common stock. The disclosure states the withholding was incident to vesting in accordance with Rule 16b3, rather than an open-market sale.

Insider Trade Summary

Net Seller: 1,757 shares

Net Sell 1 txn

Insider CURTIS GEORGE L

Role EXEC. VICE PRESIDENT (CHESI)

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,757	$290.74	$511K

Holdings After Transaction: Common Stock — 44,291 shares (Direct)

Footnotes (1)

1. F1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3

Key Figures

Shares withheld for tax liability: 1,757 shares Per-share value of withheld shares: $290.74 per share Shares held after transaction: 44,291 shares

3 metrics

Shares withheld for tax liability 1,757 shares Common stock withheld on July 1, 2026 to pay tax liability

Per-share value of withheld shares $290.74 per share Valuation applied to the 1,757 withheld shares

Shares held after transaction 44,291 shares Directly owned common stock following the withholding transaction

Key Terms

Rule 16b3, tax liability, withholding of securities

3 terms

Rule 16b3 regulatory

"incident to vesting of securities in accordance with Rule 16b3"

tax liability financial

"Payment of tax liability by withholding of securities incident"

withholding of securities financial

"Payment of tax liability by withholding of securities incident"

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Available on EDGAR 08/11/2026 - 01:51 PM Accepted by SEC EDGAR 08/11/2026 - 01:51 PM Learn about SEC filing dates

FAQ

What did Clean Harbors (CLH) executive George L. Curtis report on this Form 4?

George L. Curtis reported a withholding of 1,757 Clean Harbors (CLH) shares to cover tax liability from vesting equity awards. The transaction reflects administrative tax settlement rather than an open-market sale of common stock.

How many Clean Harbors (CLH) shares were withheld for taxes in Curtis’s transaction?

The transaction shows 1,757 shares of Clean Harbors common stock were withheld to pay tax liability. This occurred in connection with the vesting of securities, as permitted under Rule 16b3 for equity compensation arrangements.

At what price were the withheld Clean Harbors (CLH) shares valued in the Form 4?

The 1,757 withheld shares were valued at $290.74 per share. This price is used to determine the value of shares applied toward the executive’s tax liability arising from vesting of equity-based compensation awards.

How many Clean Harbors (CLH) shares does George L. Curtis hold after this tax withholding?

Following the tax-withholding transaction, George L. Curtis directly held 44,291 shares of Clean Harbors common stock. This figure reflects his position after 1,757 shares were withheld to satisfy tax obligations related to equity vesting.

Was George L. Curtis’s Clean Harbors (CLH) Form 4 transaction an open-market sale?

No, the Form 4 describes withholding of shares to pay tax liability, not an open-market sale. The footnote explains the shares were withheld incident to vesting of securities, consistent with Rule 16b3 treatment for equity compensation plans.

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 MASSACHUSETTS 02061

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	07/01/2026		F		1,757(1)	D	$290.74	44,291	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	08/11/2026
	** 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.
* Form 4: SEC 1474 (03-26)