Clean Harbors chair has 1,265 shares withheld for tax

On July 17, 2026, Clean Harbors Inc. executive chair and CTO Alan S. McKim reported a tax-withholding disposition of 1,265 shares of common stock at $310.58 per share, used to satisfy tax liabilities on vesting awards under Rule 16b3.

Rhea-AI Filing Summary

On July 17, 2026, Clean Harbors Inc. executive chair and CTO Alan S. McKim reported a tax-withholding disposition of 1,265 shares of common stock at $310.58 per share, used to satisfy tax liabilities on vesting awards under Rule 16b3. After this withholding, he holds 30,154 shares directly and indirectly holds 2,065,368 shares in the McKim 2007 Trust, 67,093 shares in the McKim 2025 Annuity Trust, and 100,000 shares in the McKim 2026 Annuity Trust.

Insider Trade Summary

Tax Withholding: 1,265 shares

Tax Withholding 4 txns

Insider MCKIM ALAN S

Role EXEC CHAIR, CTO.

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,265	$310.58	$393K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 30,154 shares (Direct); Common Stock — 100,000 shares (Indirect, McKim 2026 Annuity Trust); Common Stock — 67,093 shares (Indirect, McKim 2025 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

Key Figures

Shares withheld for taxes: 1,265 shares Withholding price per share: $310.58 per share Direct holdings after transaction: 30,154 shares +3 more

6 metrics

Shares withheld for taxes 1,265 shares Tax-withholding disposition on July 17, 2026

Withholding price per share $310.58 per share Value used for tax-withholding transaction

Direct holdings after transaction 30,154 shares Common stock directly held after July 17, 2026 withholding

McKim 2007 Trust holdings 2,065,368 shares Indirect ownership via McKim 2007 Trust

McKim 2025 Annuity Trust holdings 67,093 shares Indirect ownership via McKim 2025 Annuity Trust

McKim 2026 Annuity Trust holdings 100,000 shares Indirect ownership via McKim 2026 Annuity Trust

Key Terms

tax-withholding disposition, Rule 16b3, indirect ownership, Annuity Trust

4 terms

tax-withholding disposition financial

"reported a tax-withholding disposition of 1,265 shares of common stock"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Rule 16b3 regulatory

"tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3"

indirect ownership financial

"total_shares_following_transaction held as indirect ownership via trusts"

Annuity Trust financial

"nature_of_ownership listed as McKim 2025 Annuity Trust and McKim 2026 Annuity Trust"

FAQ

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

What insider transaction did Alan S. McKim report for CLH?

Alan S. McKim reported a tax-withholding disposition of 1,265 shares of Clean Harbors common stock on July 17, 2026. The shares were withheld to cover tax liabilities related to vesting equity awards under Rule 16b3, not sold in an open-market trade.

At what price were the 1,265 CLH shares withheld for taxes?

The 1,265 shares were withheld at a price of $310.58 per share. This price reflects the value used to satisfy McKim’s tax obligation tied to vesting securities, as disclosed in the Form 4 tax-withholding transaction.

How many CLH shares does Alan S. McKim hold directly after this filing?

Following the tax-withholding transaction, Alan S. McKim directly holds 30,154 shares of Clean Harbors common stock. This direct holding figure is reported as the total shares following the July 17, 2026 tax-withholding disposition.

What indirect CLH holdings does Alan S. McKim report through trusts?

McKim reports indirect ownership of 2,065,368 shares via the McKim 2007 Trust, 67,093 shares via the McKim 2025 Annuity Trust, and 100,000 shares via the McKim 2026 Annuity Trust. These positions are classified as indirect ownership entries on the Form 4.

Was the CLH insider transaction made under a Rule 10b5-1 trading plan?

No. The Form 4’s Rule 10b5-1 checkbox is not marked, and the filing lists the event as a tax-withholding disposition. The transaction reflects shares withheld for taxes on vesting, not trades executed under a preset trading plan.

Does the Form 4 for CLH indicate any open-market share sales by McKim?

The filing reports a tax-withholding disposition (code F) of 1,265 shares to pay tax liabilities. It does not describe any open-market purchase or sale; the shares were withheld by the issuer incident to vesting of equity awards.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/20/2026 - 11:58 AM EDT 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 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/17/2026

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	07/17/2026		F		1,265(1)	D	$310.58	30,154	D
Common Stock								100,000	I	McKim 2026 Annuity Trust
Common Stock								67,093	I	McKim 2025 Annuity Trust
Common Stock								2,065,368	I	McKim 2007 Trust

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	07/20/2026
	** 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)