Clean Harbors (CLH) co-CEO Gerstenberg sells 2,500 shares in Form 4 filing

Rhea-AI Filing Summary

Clean Harbors (CLH) co-CEO Eric W. Gerstenberg reported an open-market sale of 2,500 shares of common stock at a price of $279.86 per share. After this transaction, he directly held 43,020 shares. The filing classifies the move as a sale in the open market or a private transaction.

Insights

Equity compensation and insider-trading analyst

Co-CEO executed a modest open-market share sale, with holdings remaining substantial.

Eric W. Gerstenberg, co-CEO of Clean Harbors, sold 2,500 shares of common stock in an open-market transaction at $279.86 per share. Following the sale, his direct ownership stands at 43,020 shares, according to the Form 4 disclosure.

The transaction is coded as a sale in the open market or a private transaction, with no accompanying footnotes suggesting indirect ownership structures or disclaimers. On its own, this appears as a routine insider sale rather than a transformative event, and the broader impact depends on the overall context of his total holdings and prior trading patterns.

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
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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^*

GERSTENBERG ERIC W

(Last) (First) (Middle)

C/O CLEAN HARBORS ENVIRON. SERVICES 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)
	CO-CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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	02/23/2026		S		2,500	D	$279.86	43,020	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:

	/s/ Eric W. Gerstenberg	02/24/2026
	** 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 did Clean Harbors (CLH) co-CEO Eric W. Gerstenberg report in this Form 4?

Eric W. Gerstenberg reported selling 2,500 shares of Clean Harbors common stock. The transaction was an open-market or private sale at $279.86 per share, and it reduced, but did not eliminate, his direct ownership stake in the company.

How many Clean Harbors (CLH) shares does Eric W. Gerstenberg hold after the reported sale?

After the reported sale, Eric W. Gerstenberg directly holds 43,020 shares of Clean Harbors common stock. This figure reflects his remaining ownership position following the 2,500-share open-market or private transaction disclosed in the Form 4 filing.

What was the price per share in Eric W. Gerstenberg’s Clean Harbors (CLH) stock sale?

The reported sale was executed at $279.86 per share. This price applies to the 2,500 shares of Clean Harbors common stock sold in the open-market or private transaction described in the Form 4 insider trading report.

What is the transaction code and description for the Clean Harbors (CLH) insider trade?

The transaction carries code “S,” indicating a sale, and is described as a sale in an open market or private transaction. This confirms the Form 4 reflects a straightforward disposition of Clean Harbors common stock by the co-CEO.

Is Eric W. Gerstenberg’s ownership in Clean Harbors (CLH) direct or indirect after this Form 4?

Following the reported transaction, Eric W. Gerstenberg’s 43,020 shares are categorized as directly owned. The filing lists the ownership type and code as direct, and there are no footnotes indicating indirect holding entities or disclaimed beneficial ownership.