Clean Harbors (CLH) EVP reports tax withholding and share forfeiture

Rhea-AI Filing Summary

Clean Harbors Inc. executive and 10% owner reported routine share reductions tied to compensation on 03/13/2026. The EVP, EHS had 18 shares of common stock withheld at $288.93 per share to cover tax liabilities when equity vested, and 368 restricted shares were forfeited because performance targets under the Long Term Equity Incentive Program were not met. Following these dispositions, the reporting person directly owned 6,648 shares of common stock.

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

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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)
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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/13/2026		F		18(1)	D	$288.93	7,016	D
Common Stock	03/13/2026		D		368(2)	D	$0	6,648	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. Shares of restricted stock forfeited due to the Company not achieving performance targets under its Long Term Equity Incentive Program.

	/s/ Robert W. Harrison	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.

FAQ

What insider transactions did CLEAN HARBORS (CLH) report on March 13, 2026?

The filing shows the EVP, EHS disposed of shares on 03/13/2026. 18 shares were withheld to pay taxes on vesting, and 368 restricted shares were forfeited because performance goals under the Long Term Equity Incentive Program were not achieved.

How many CLEAN HARBORS (CLH) shares does the reporting person hold after these transactions?

After the reported transactions, the EVP, EHS directly owns 6,648 shares of CLEAN HARBORS common stock. This figure reflects both the 18-share tax withholding and the 368-share forfeiture tied to performance-based restricted stock.

Why were some CLEAN HARBORS (CLH) shares withheld at $288.93 per share?

The company withheld 18 shares of CLEAN HARBORS common stock at $288.93 per share to pay the reporting person’s tax liability. This occurred when equity awards vested, consistent with Rule 16b-3 treatment for tax withholding on share-based compensation.

Why did the CLEAN HARBORS (CLH) executive forfeit 368 restricted shares?

The EVP, EHS forfeited 368 shares of restricted stock because CLEAN HARBORS did not achieve performance targets. These shares were tied to the company’s Long Term Equity Incentive Program, which conditions vesting on meeting specified performance goals.

What do transaction codes F and D mean in the CLEAN HARBORS (CLH) Form 4?

In this Form 4, code F reports 18 shares withheld to satisfy tax obligations upon vesting. Code D reports the disposition of 368 restricted shares that were forfeited when performance criteria under the Long Term Equity Incentive Program were not met.

What is the reporting person’s role and status at CLEAN HARBORS (CLH)?

The reporting person is an Executive Vice President, EHS at CLEAN HARBORS and is also listed as a 10% owner. This combination of executive role and significant ownership triggers ongoing Form 4 reporting obligations for transactions in company stock.