Clean Harbors (CLH) EVP Harrison granted restricted stock while shares withheld for taxes

Rhea-AI Filing Summary

Clean Harbors (CLH) executive Robert W. Harrison, EVP EHS, reported equity compensation and related tax withholding transactions. On 02/01/2026 he received 1,003 shares as a performance-based restricted stock award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, based on goals for the 2027 performance period.

He also received 430 shares as a time-based restricted stock award vesting 25% annually from February 1, 2027 through February 1, 2030. On 02/02/2026, 184 shares were withheld at $259.91 per share to cover tax liabilities from vesting. After these transactions, he directly owned 7,034 common shares.

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

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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^*

Harrison Robert W.

(Last) (First) (Middle)

42 LONGWATER DR

(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, EHS

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		184(1)	D	$259.91	5,601	D
Common Stock	02/01/2026		A		1,003(2)	A	$0	6,604	D
Common Stock	02/01/2026		A		430(3)	A	$0	7,034	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/ Robert W. Harrison	02/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did CLH executive Robert W. Harrison report on this Form 4?

He reported equity awards and tax withholding transactions involving Clean Harbors (CLH) common stock. On February 1, 2026 he received performance-based and time-based restricted stock, and on February 2, 2026, 184 shares were withheld to satisfy tax liabilities from vesting.

How many Clean Harbors (CLH) shares were granted to Robert W. Harrison?

He received 1,003 shares as a performance-based restricted stock award and 430 shares as a time-based restricted stock award. Both are stock compensation grants with vesting schedules extending from 2027 through 2030, subject to specified conditions and performance goals.

What is the vesting schedule for Robert W. Harrison’s performance-based restricted stock in CLH?

The performance-based restricted stock award of 1,003 shares will vest 50% on March 15, 2028 and 50% on March 15, 2029. Vesting depends on achieving certain goals during the performance period from January 1, 2027 through December 31, 2027.

How does the time-based restricted stock award for CLH’s EVP vest over time?

The 430-share time-based restricted stock award vests in four equal installments. It vests 25% on February 1 of each year from 2027 through 2030, providing annual stock-based compensation to the executive if he remains eligible on each vesting date.

Why were 184 Clean Harbors (CLH) shares withheld from Robert W. Harrison?

The 184 shares were withheld on February 2, 2026 at a price of $259.91 per share to pay tax liabilities. This withholding occurred in connection with vesting of securities, consistent with Rule 16b-3 treatment for stock-based compensation.

How many CLH shares does Robert W. Harrison own after these transactions?

Following the reported transactions, Robert W. Harrison directly owned 7,034 shares of Clean Harbors common stock. This figure reflects the new restricted stock grants and the 184 shares withheld for taxes, as reported in the Form 4 filing’s ownership column.