Clean Harbors (NYSE: CLH) Co-CEO sells 2,500 shares at $321.34

Rhea-AI Filing Summary

CLEAN HARBORS INC (CLH) reported an insider transaction by Co-CEO Eric W. Gerstenberg. On 2026-08-14, he sold 2,500 shares of Common Stock at $321.34 per share in a sale described as an open market or private transaction. Following this sale, he directly holds 56,793 shares of Clean Harbors common stock.

Insider Trade Summary

Net Seller: 2,500 shares

Net Sell 1 txn

Insider GERSTENBERG ERIC W

Role CO-CEO

Sold 2,500 shs ($803K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,500	$321.34	$803K

Holdings After Transaction: Common Stock — 56,793 shares (Direct)

Key Figures

Shares sold: 2,500 shares Sale price per share: $321.34 Shares owned after transaction: 56,793 shares +1 more

4 metrics

Shares sold 2,500 shares Common Stock sale on 2026-08-14 by Co-CEO Eric W. Gerstenberg

Sale price per share $321.34 Per-share price for the 2,500 shares of Common Stock sold

Shares owned after transaction 56,793 shares Direct Common Stock holdings of Eric W. Gerstenberg after the sale

Total shares sold in filing 2,500 shares Net shares sold across all reported transactions in this Form 4

Key Terms

Common Stock, open market or private transaction, direct ownership

3 terms

Common Stock financial

"The security title reported is Common Stock for this 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.

open market or private transaction financial

"The sale is described as a Sale in open market or private transaction"

direct ownership financial

"The filing indicates the ownership type as direct for these shares"

FAQ

What insider transaction did CLH report for Eric W. Gerstenberg?

Clean Harbors Co-CEO Eric W. Gerstenberg reported a sale of 2,500 shares of Common Stock. The transaction occurred on 2026-08-14 and was reported as a sale in an open market or private transaction.

At what price were the CLH shares sold in this Form 4 filing?

The reported sale of Clean Harbors (CLH) shares was executed at $321.34 per share. This price reflects the per-share value for the 2,500 Common Stock shares sold by Co-CEO Eric W. Gerstenberg.

How many CLH shares does Eric W. Gerstenberg own after this sale?

After the reported transaction, Eric W. Gerstenberg directly owns 56,793 shares of Clean Harbors Common Stock. This figure represents his post-transaction holdings as disclosed in the Form 4 filing.

What is the transaction type reported for CLH in this Form 4?

The Form 4 for Clean Harbors (CLH) shows a sale transaction of Common Stock. It is coded as a sale in an open market or private transaction, indicating a disposition of shares rather than an acquisition.

Who is the insider involved in the latest CLH Form 4 filing?

The insider is Eric W. Gerstenberg, Co-CEO of Clean Harbors (CLH). He reported a sale of 2,500 shares of the company’s Common Stock, with 56,793 shares remaining held directly afterward.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 02:48 PM Accepted by SEC EDGAR 08/18/2026 - 02:47 PM 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)
08/14/2026

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	08/14/2026		S		2,500	D	$321.34	56,793	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	08/18/2026
	** 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)