CLEAN HARBORS chair reports tax-share withholding

CLEAN HARBORS INC executive Alan S. McKim reported routine share movements mainly related to tax withholding and trust holdings.

Rhea-AI Filing Summary

CLEAN HARBORS INC executive Alan S. McKim reported routine share movements mainly related to tax withholding and trust holdings. The filing shows an F-code transaction where 1,343 shares of common stock were withheld at $290.74 per share to cover a tax liability upon vesting, a non-market disposition under Rule 16b-3.

After this tax-withholding event, McKim directly holds 31,419 common shares. He also has indirect ownership through several trusts, including 2,065,368 shares held by the McKim 2007 Trust, 67,093 shares held by the McKim 2025 Annuity Trust, and 100,000 shares held by the McKim 2026 Annuity Trust.

Insights

Equity compensation specialist

Filing shows routine tax withholding on vested shares.

The Form 4 for CLEAN HARHORS INC executive Alan S. McKim records an F-code transaction where 1,343 shares were withheld at $290.74 per share to satisfy tax obligations tied to vesting, as noted under Rule 16b-3.

F-code events are not open-market sales and generally carry limited signaling value for investors because they occur automatically when awards vest. The filing also lists sizeable indirect holdings through the McKim 2007 Trust and annuity trusts, indicating substantial continuing equity exposure after this routine tax event.

Insider Trade Summary

Exercise Price or Tax Liability: 1,343 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	1,343	$290.74	$390K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 31,419 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

Tax-withheld shares: 1,343 shares Tax-withholding price: $290.74 per share Direct holdings after transaction: 31,419 shares +3 more

6 metrics

Tax-withheld shares 1,343 shares Withheld to cover tax liability on vesting (F-code)

Tax-withholding price $290.74 per share Price for 1,343 withheld shares

Direct holdings after transaction 31,419 shares Common stock directly owned after F-code event

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 2025 Annuity Trust

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

Key Terms

Rule 16b-3, tax liability, withholding of securities, vesting of securities, +1 more

5 terms

Rule 16b-3 regulatory

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

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

tax liability financial

"Payment of tax liability by withholding of securities incident to vesting of securities"

withholding of securities financial

"Payment of tax liability by withholding of securities incident to vesting of securities"

vesting of securities financial

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

F-code transaction regulatory

"The filing shows an F-code transaction where 1,343 shares were withheld"

FAQ

What insider transaction did Alan S. McKim report for CLEAN HARBORS INC (CLH)?

Alan S. McKim reported an F-code transaction where 1,343 shares of CLEAN HARBORS INC common stock were withheld at $290.74 per share to cover tax liabilities arising from vesting, a routine non-market disposition classified under Rule 16b-3.

Does the McKim Form 4 for CLEAN HARBORS INC show an open-market sale or purchase?

The Form 4 does not show any open-market purchases or sales. It records an F-code tax-withholding disposition of 1,343 shares tied to vesting, plus updates to indirect trust holdings, which are categorized as holdings rather than new buys or sells.

How many CLEAN HARBORS INC shares does Alan S. McKim hold directly after this filing?

Following the reported tax-withholding event, Alan S. McKim directly holds 31,419 shares of CLEAN HARBORS INC common stock. This figure reflects his remaining direct ownership after 1,343 shares were withheld to satisfy tax obligations associated with vested equity awards.

What indirect CLEAN HARBORS INC holdings are reported for Alan S. McKim on this Form 4?

The filing reports indirect ownership through multiple trusts: 2,065,368 shares held by the McKim 2007 Trust, 67,093 shares held by the McKim 2025 Annuity Trust, and 100,000 shares held by the McKim 2026 Annuity Trust, all in CLEAN HARBORS INC common stock.

What does an F-code tax-withholding transaction mean for CLEAN HARBORS INC insiders?

An F-code transaction indicates shares are withheld to pay exercise price or taxes on vesting, rather than sold on the market. For CLEAN HARBORS INC, McKim’s 1,343 withheld shares reflect a mechanical tax payment step, not a discretionary trade or change in investment view.

Is the McKim 2007 Trust responsible for any CLEAN HARBORS INC share transactions here?

The McKim 2007 Trust is listed as holding 2,065,368 CLEAN HARBORS INC shares, but the entry is categorized as a holding with an unknown transaction code. It reflects reported indirect ownership levels rather than a new buy or sell transaction in this filing.

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Accepted by SEC EDGAR 07/06/2026 - 03:10 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 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)
07/01/2026

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		1,343(1)	D	$290.74	31,419	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	07/06/2026
	** 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)