Clean Harbors chair has 1,265 shares withheld for tax

Clean Harbors executive chair and CTO Alan S. McKim reported a routine tax-related share withholding on Common Stock.

Rhea-AI Filing Summary

Clean Harbors executive chair and CTO Alan S. McKim reported a routine tax-related share withholding on Common Stock. On March 13, 2026, 1,265 shares were withheld at $288.93 per share to cover tax liabilities upon vesting under Rule 16b-3.

After this transaction, McKim held 32,762 shares directly. He also reported indirect holdings of 67,093 shares through the McKim 2025 Annuity Trust, 100,000 shares through the McKim 2026 Annuity Trust, and 2,065,368 shares through the McKim 2007 Trust.

Insider Trade Summary

Exercise Price or Tax Liability: 1,265 shares

Exercise Price or Tax Liability 4 txns

Insider MCKIM ALAN S

Role EXEC CHAIR, CTO.

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	1,265	$288.93	$365K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 32,762 shares (Direct); Common Stock — 67,093 shares (Indirect, McKim 2025 Annuity Trust); Common Stock — 100,000 shares (Indirect, McKim 2026 Annuity Trust); Common Stock — 2,065,368 shares (Indirect, McKim 2007 Trust)

Footnotes (1)

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

FAQ

What did Alan S. McKim report in the latest Clean Harbors (CLH) Form 4?

Alan S. McKim reported a tax-related share withholding, not an open-market trade. On March 13, 2026, 1,265 shares of Clean Harbors common stock were withheld to cover tax liabilities associated with vesting, as permitted under Rule 16b-3.

How many Clean Harbors (CLH) shares were withheld for taxes from Alan McKim?

A total of 1,265 shares of Clean Harbors common stock were withheld from Alan McKim. The withholding occurred at $288.93 per share to satisfy tax obligations tied to vesting of equity awards, according to the Form 4 disclosure and related footnote.

How many Clean Harbors (CLH) shares does Alan McKim hold directly after this Form 4?

Following the tax-withholding transaction, Alan McKim held 32,762 shares of Clean Harbors common stock directly. This direct position reflects his remaining stake after 1,265 shares were withheld to pay taxes related to vesting of previously granted securities.

What indirect Clean Harbors (CLH) holdings does Alan McKim report through trusts?

Alan McKim reports several indirect Clean Harbors holdings via trusts: 67,093 shares in the McKim 2025 Annuity Trust, 100,000 shares in the McKim 2026 Annuity Trust, and 2,065,368 shares in the McKim 2007 Trust, as detailed in the Form 4 holding entries.

Was Alan McKim’s Clean Harbors (CLH) Form 4 transaction a market sale?

No, the Form 4 describes a tax-withholding disposition, not a market sale. Shares were withheld by the issuer to satisfy tax liabilities on vesting under Rule 16b-3, meaning McKim did not execute an open-market sell order for these 1,265 shares.

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Accepted by SEC EDGAR 03/17/2026 - 03:08 PM Learn about SEC filing dates

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^*

MCKIM ALAN S

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EXEC CHAIR, CTO.

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								67,093	I	McKim 2025 Annuity Trust
Common Stock								100,000	I	McKim 2026 Annuity Trust
Common Stock								2,065,368	I	McKim 2007 Trust
Common Stock	03/13/2026		F		1,265(1)	D	$288.93	32,762	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/ C. Michael Malm, Attorney-in-Fact	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.
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