Clean Harbors (CLH) EVP granted restricted stock and withholds shares for taxes

Rhea-AI Filing Summary

Clean Harbors executive Jeroen Diderich reported equity compensation and a small tax-related share withholding. On 02/01/2026 he received 3,141 shares of common stock as a performance-based restricted stock award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, tied to goals for the 1/1/2027–12/31/2027 performance period. He also received a 1,047-share restricted stock award vesting 25% annually on February 1 of 2027, 2028, 2029 and 2030. On 02/02/2026, 105 shares were withheld at $259.91 per share to cover tax liabilities upon vesting, leaving him with 13,667, 16,808 and then 17,855 directly owned shares after the respective transactions.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Diderich Jeroen

Role EVP&President of Sales&Service

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	105	$259.91	$27K
Grant/Award	Common Stock	3,141	$0.00	--
Grant/Award	Common Stock	1,047	$0.00	--

Holdings After Transaction: Common Stock — 13,667 shares (Direct)

Footnotes (1)

1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3. Performance-Based Restricted Stock Award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, depending on achievement of certain goals during the performance period 1/1/2027 through 12/31/2027 Restricted Stock Award vesting as to 25% on February 1, 2027; 25% on February 1, 2028; 25% on February 1, 2029; and 25% on February 1, 2030.

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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 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)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/01/2026

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	02/02/2026		F		105(1)	D	$259.91	13,667	D
Common Stock	02/01/2026		A		3,141(2)	A	$0	16,808	D
Common Stock	02/01/2026		A		1,047(3)	A	$0	17,855	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. Performance-Based Restricted Stock Award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, depending on achievement of certain goals during the performance period 1/1/2027 through 12/31/2027

3. Restricted Stock Award vesting as to 25% on February 1, 2027; 25% on February 1, 2028; 25% on February 1, 2029; and 25% on February 1, 2030.

	/s/ Jeroen Diderich	02/03/2026
	** 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.

FAQ

What insider transactions did CLH executive Jeroen Diderich report?

Jeroen Diderich reported equity awards and a small tax withholding. He received 3,141 performance-based restricted shares, 1,047 time-based restricted shares, and had 105 shares withheld at $259.91 per share to satisfy tax liabilities linked to vesting.

How many Clean Harbors (CLH) shares were granted to Jeroen Diderich?

He was granted 3,141 performance-based restricted shares and 1,047 time-based restricted shares of Clean Harbors common stock. Both grants were reported at a price of $0, reflecting stock awards rather than open-market purchases for cash consideration.

What are the vesting terms for Diderich’s performance-based restricted stock at CLH?

The 3,141 performance-based restricted shares vest 50% on March 15, 2028 and 50% on March 15, 2029. Vesting depends on achievement of specified goals during the performance period from January 1, 2027 through December 31, 2027.

When do Jeroen Diderich’s time-based restricted stock awards at CLH vest?

The 1,047-share restricted stock award vests in four equal installments. It vests 25% on February 1, 2027, 25% on February 1, 2028, 25% on February 1, 2029, and 25% on February 1, 2030, assuming continued service.

Why were 105 Clean Harbors (CLH) shares withheld from Jeroen Diderich?

The 105 shares were withheld to pay tax liabilities associated with vesting of prior awards. This tax withholding at $259.91 per share is described as a payment of tax liability by withholding securities in accordance with Rule 16b-3.

How many Clean Harbors shares does Jeroen Diderich own after these transactions?

After the 105-share tax withholding on February 2, 2026, Diderich directly owned 13,667 shares. Following the February 1, 2026 grants, his reported directly owned amounts rose to 16,808 and then 17,855 shares, reflecting the additional restricted stock awards.