Clean Harbors (CLH) Co-CEO sells 1,000 shares and corrects holdings

Rhea-AI Filing Summary

Clean Harbors Inc. reported an amended insider transaction by Co-CEO Eric W. Gerstenberg. On 2026-03-18, he executed a sale of 1,000 shares of Common Stock at a price of $293.00 per share in an open market or private transaction. Following this sale, his directly held position is reported as 59,857 shares, with a footnote stating this reflects a correction to the total number of shares held.

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 F1	1,000	$293.00	$293K

Holdings After Transaction: Common Stock — 59,857 shares (Direct)

Footnotes (1)

1. F1. Correction to Total Number of Shares Held.

Key Figures

Shares sold: 1,000 shares Sale price per share: $293.00 per share Shares held after transaction: 59,857 shares

3 metrics

Shares sold 1,000 shares Common Stock sale by Co-CEO on 2026-03-18

Sale price per share $293.00 per share Price for the 2026-03-18 Common Stock sale

Shares held after transaction 59,857 shares Direct Common Stock holdings after the sale, as corrected

Key Terms

Common Stock, Sale in open market or private transaction, Form 4/A, direct ownership

4 terms

Common Stock financial

"security_title: "Common Stock" for the reported transaction"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Sale in open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

Form 4/A regulatory

"Amended insider report filed on Form 4/A"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

direct ownership financial

"ownership_type reported as "direct" for the shares held"

FAQ

What insider transaction did Clean Harbors (CLH) report in this Form 4/A?

Clean Harbors reported that Co-CEO Eric W. Gerstenberg sold 1,000 shares of Common Stock on 2026-03-18 in a transaction coded as an open market or private sale.

At what price did the CLH insider shares sell in the latest Form 4/A?

Eric W. Gerstenberg sold 1,000 CLH shares at a price of $293.00 per share. The filing identifies the transaction as a sale in an open market or private transaction.

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

After the reported sale, Eric W. Gerstenberg directly holds 59,857 shares of Clean Harbors Common Stock. A footnote explains this figure reflects a correction to the total number of shares held.

What is being corrected in this amended Form 4/A for Clean Harbors (CLH)?

The amendment indicates a correction to the total number of shares held by Co-CEO Eric W. Gerstenberg. The corrected post-transaction direct ownership is shown as 59,857 shares.

Is the reported CLH insider transaction under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not checked, and there is no footnote describing a trading plan. The sale is reported simply as an open market or private transaction.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/14/2026 - 09:21 AM Accepted by SEC EDGAR 08/14/2026 - 09:20 AM 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)
03/19/2026

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	59,857(1)	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. Correction to Total Number of Shares Held.

	/s/ Eric W. Gerstenberg	08/14/2026
	** 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)