Clean Harbors co-CEO sells 1,000 CLH shares

Clean Harbors CO-CEO Eric W. Gerstenberg reported an open-market sale of 1,000 shares of Common Stock at $293 per share.

Rhea-AI Filing Summary

Clean Harbors CO-CEO Eric W. Gerstenberg reported an open-market sale of 1,000 shares of Common Stock at $293 per share. After this transaction, he directly owns 38,877 shares. The sale represents a relatively small portion of his reported holdings and appears routine in scale.

Insights

Insider transactions analyst

Small, routine insider sale with substantial shares retained.

CO-CEO Eric W. Gerstenberg sold 1,000 shares of Clean Harbors Common Stock in an open-market transaction at $293 per share. The filing shows this as a straightforward sale, with no derivative exercises or related transactions reported.

Following the sale, Gerstenberg still directly holds 38,877 shares, indicating he retains a sizable equity position. With no footnote references to trading plans or complex ownership structures, this appears to be a standard liquidity event rather than a major change in his economic exposure.

Insider Trade Summary

Net Seller: 1,000 shares

Net Sell 1 txn

Insider GERSTENBERG ERIC W

Role CO-CEO

Sold 1,000 shs ($293K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,000	$293.00	$293K

Holdings After Transaction: Common Stock — 38,877 shares (Direct)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Clean Harbors (CLH) report for Eric W. Gerstenberg?

Clean Harbors reported that CO-CEO Eric W. Gerstenberg sold 1,000 shares of Common Stock. The shares were sold in an open-market transaction at a price of $293 per share, according to the Form 4 insider filing details.

At what price did the Clean Harbors (CLH) CO-CEO sell his shares?

Eric W. Gerstenberg sold his 1,000 Clean Harbors shares at $293 per share. This price reflects the transaction value disclosed in the Form 4, characterizing the trade as an open-market sale of Common Stock rather than part of a derivative exercise.

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

After the reported sale, Eric W. Gerstenberg directly owns 38,877 Clean Harbors shares. This post-transaction balance is shown in the Form 4 and indicates he continues to maintain a significant direct equity stake in the company despite the modest sale.

Was the Clean Harbors (CLH) insider transaction a buy or a sell?

The transaction was a sell. The Form 4 lists transaction code “S” and describes it as an open-market sale, with 1,000 shares of Clean Harbors Common Stock sold by CO-CEO Eric W. Gerstenberg at $293 per share.

Did the Clean Harbors (CLH) Form 4 involve any derivative securities?

No, the reported transaction involved only Common Stock. The Form 4 classifies it as a non-derivative transaction, and the derivativeSummary section shows no remaining derivative positions tied to this specific filing for Eric W. Gerstenberg.

How significant is Eric W. Gerstenberg’s sale of Clean Harbors (CLH) shares?

The sale of 1,000 shares appears modest relative to his 38,877 shares held afterward. This scale suggests a routine liquidity transaction, rather than a major reduction of his overall exposure to Clean Harbors equity based on the amounts disclosed in the Form 4.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/19/2026 - 03:19 PM EDT Learn about SEC filing dates

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^*

GERSTENBERG ERIC W

(Last) (First) (Middle)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/18/2026

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	03/18/2026		S		1,000	D	$293	38,877	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	03/19/2026
	** 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)