What was the purpose of the 16-share disposition reported for Clean Harbors (CLH)?

The 16 shares were withheld to pay tax liability incident to the vesting of securities, as explained under Rule 16b-3.

Clean Harbors insider reports tax share withholding of 16 shares

Clean Harbors Inc. executive vice president of EHS reported a small, tax-related stock disposition.

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Rhea-AI Filing Summary

Clean Harbors Inc. executive vice president of EHS reported a small, tax-related stock disposition. On 12/15/2025, 16 shares of common stock were withheld at a price of $240.71 per share to pay tax liabilities arising from vesting equity awards, consistent with Rule 16b-3. After this transaction, the officer directly owns 5,785 shares of Clean Harbors common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 16 shares

Exercise Price or Tax Liability 1 txn

Insider Harrison Robert W.

Role EVP, EHS

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	16	$240.71	$4K

Holdings After Transaction: Common Stock — 5,785 shares (Direct)

Footnotes (1)

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

An executive vice president of EHS reported that 16 shares of Clean Harbors common stock were withheld on 12/15/2025 to cover taxes on vesting equity.

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

The transaction involved 16 shares of Clean Harbors common stock, treated as a disposition at a price of $240.71 per share.

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

Following the tax-related withholding, the executive directly owns 5,785 shares of Clean Harbors common stock.

What is the reporting person’s relationship to Clean Harbors (CLH)?

The reporting person is an officer of Clean Harbors, serving as executive vice president of EHS.

Was any derivative security activity reported for Clean Harbors (CLH) in this filing?

The derivative securities table is present, but no derivative security transactions are reported in the provided content.

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Accepted by SEC EDGAR 12/17/2025 - 08:23 AM EST

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^*

Harrison Robert W.

(Last)

(First)

(Middle)

42 LONGWATER DR

(Street)

NORWELL

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, EHS

3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	12/15/2025		F		16⁽¹⁾	D	$240.71	5,785	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

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

	/s/ Robert W. Harrison	12/17/2025
	** 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