Were any of Brian P. Weber’s CLEAN HARBORS INC (CLH) transactions related to taxes?

Yes. On March 13, 2026, 960 CLEAN HARBORS INC shares were disposed of to pay tax liabilities by withholding securities upon vesting, consistent with Rule 16b-3 treatment of compensation-related equity.

Clean Harbors EVP sells 4,683 shares in Form 4

Clean Harbors EVP Brian P. Weber reported several stock transactions.

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Rhea-AI Filing Summary

Clean Harbors EVP Brian P. Weber reported several stock transactions. On March 17, 2026, he executed an open-market sale of 4,683 shares of Common Stock at $293.39 per share and held 48,728 shares directly afterward.

On March 13, 2026, 960 shares were disposed of to cover tax liabilities at $288.93 per share, and 1,869 shares were forfeited back to the company because performance targets under its Long Term Equity Incentive Program were not achieved. These March 13 events were non-market dispositions related to compensation and plan performance.

Insider Trade Summary

Net Seller: 4,683 shares

Net Sell 3 txns

Insider Weber Brian P

Role EVP (CHESI)

Sold 4,683 shs ($1.37M)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,683	$293.39	$1.37M
Exercise Price or Tax Liability	Common Stock	960	$288.93	$277K
Disposition	Common Stock	1,869	$0.00	$0.00

Holdings After Transaction: Common Stock — 48,728 shares (Direct)

Footnotes (2)

F1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3.
F2. Shares of restricted stock forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program.

FAQ

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What insider transactions did CLEAN HARBORS INC (CLH) report for Brian P. Weber?

Brian P. Weber reported an open-market sale of 4,683 CLEAN HARBORS INC shares and two non-market dispositions tied to tax withholding and performance-based forfeiture, all involving the company’s Common Stock in March 2026.

How many CLEAN HARBORS INC (CLH) shares did Brian P. Weber sell and at what price?

Brian P. Weber sold 4,683 shares of CLEAN HARBORS INC Common Stock in an open-market transaction at $293.39 per share, according to the Form 4 insider filing dated March 17, 2026.

How many CLEAN HARBORS INC (CLH) shares does Brian P. Weber hold after these transactions?

After the March 17, 2026 open-market sale, Brian P. Weber directly holds 48,728 shares of CLEAN HARBORS INC Common Stock, as reported in the Form 4 filing.

Why were some of Brian P. Weber’s CLEAN HARBORS INC (CLH) shares forfeited?

On March 13, 2026, 1,869 shares of restricted CLEAN HARBORS INC stock were forfeited because the company did not achieve required performance targets under its Long Term Equity Incentive Program, as described in the Form 4 footnotes.

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Accepted by SEC EDGAR 03/17/2026 - 03:53 PM EDT

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^*

Weber Brian P

(Last)

(First)

(Middle)

27 INDEPENDENCE DRIVE

(Street)

WALPOLE

02081

(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 (CHESI)

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)
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	03/13/2026		F		960⁽¹⁾	D	$288.93	55,280	D
Common Stock	03/13/2026		D		1,869⁽²⁾	D	$0	53,411	D
Common Stock	03/17/2026		S		4,683	D	$293.39	48,728	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.

2. Shares of restricted stock forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program.

	/s/ Brian P. Weber	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.
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