Clean Harbors (CLH) EVP reports tax-withholding of 1,717 shares, holds 16,152

Rhea-AI Filing Summary

Clean Harbors Inc. executive Jeroen Diderich reported a tax-related share withholding. On 2026-06-01, 1,717 shares of Common Stock were disposed of at $281.00 per share to cover tax liabilities tied to vesting, in a transaction structured as withholding of shares rather than an open‑market sale. Following this event, he directly held 16,152 shares, which includes 14 shares acquired under the Clean Harbors Employee Stock Purchase Plan.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Diderich Jeroen

Role EVP&President of Sales&Service

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,717	$281.00	$482K

Holdings After Transaction: Common Stock — 16,152 shares (Direct, null)

Footnotes (1)

1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3 Includes 14 shares acquired under the Clean Harbors Employee Stock Purchase Plan.

Key Figures

Tax-withholding shares: 1,717 shares Price per share: $281.00 per share Shares after transaction: 16,152 shares +1 more

4 metrics

Tax-withholding shares 1,717 shares Common Stock withheld for tax on 2026-06-01

Price per share $281.00 per share Value used for tax-withholding disposition

Shares after transaction 16,152 shares Direct holdings following tax-withholding event

ESPP shares included 14 shares Acquired under Clean Harbors Employee Stock Purchase Plan

Key Terms

tax-withholding disposition, Rule 16b3, Employee Stock Purchase Plan, Common Stock

4 terms

tax-withholding disposition financial

"transaction_action: tax-withholding disposition"

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

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

Employee Stock Purchase Plan financial

"Includes 14 shares acquired under the Clean Harbors Employee Stock Purchase Plan."

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

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^*

Diderich Jeroen

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP&President of Sales&Service

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

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	06/01/2026		F		1,717(1)	D	$281	16,152(2)	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

2. Includes 14 shares acquired under the Clean Harbors Employee Stock Purchase Plan.

	/s/ Jeroen Diderich	06/03/2026
	** 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)

FAQ

What did Clean Harbors (CLH) executive Jeroen Diderich report on this Form 4?

He reported a tax-withholding disposition of 1,717 shares of Common Stock. The shares were withheld to satisfy tax liabilities arising from vested equity, not sold in the open market, under Rule 16b-3 procedures.

Was the Clean Harbors (CLH) Form 4 transaction an open-market sale?

No, it was not an open-market sale. The 1,717 shares were withheld by the company to cover tax liability associated with vesting of securities, as described as a payment of tax liability by withholding of securities.

How many Clean Harbors (CLH) shares does Jeroen Diderich hold after the transaction?

After the tax-withholding disposition, he directly holds 16,152 shares of Common Stock. This total specifically includes 14 shares acquired through the Clean Harbors Employee Stock Purchase Plan, according to the footnote disclosure.

What price per share was used for the tax-withholding disposition on Clean Harbors (CLH) stock?

The tax-withholding disposition used a value of $281.00 per share for the 1,717 shares. This figure is disclosed as the price per share for the non-derivative Common Stock transaction on the reported date.

What does the Rule 16b-3 reference mean in the Clean Harbors (CLH) Form 4?

The filing notes the tax payment occurred by withholding securities incident to vesting in accordance with Rule 16b-3. This rule governs certain insider transactions, allowing these administrative, compensation-related withholdings without treating them as regular market trades.