Was the Clean Harbors (CLH) Co-CEO’s share sale under a Rule 10b5-1 plan?

The filing’s 10b5-1 checkbox is not marked as true, and there is no footnote referencing a trading plan. Based on the provided data, the sale is not identified as executed under a Rule 10b5-1 plan.

Clean Harbors Co-CEO sells 2,500 company shares

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

Clean Harbors Co-CEO Eric W. Gerstenberg reported a sale of 2,500 shares of common stock on 2026-02-23, categorized as an open market or private transaction at a specified per-share price.

Q: How many Clean Harbors (CLH) shares did the Co-CEO sell and at what price?

Eric W. Gerstenberg sold 2,500 shares of Clean Harbors common stock at $279.86 per share. The transaction is labeled as a sale in open market or private transaction in the filing data.

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

The amendment notes a “Correction to Total Number of Shares Held.” This indicates the primary change is to the post-transaction share balance rather than the basic mechanics of the reported sale itself.

Q: Is the reported Clean Harbors (CLH) transaction a buy or a sell by the Co-CEO?

The transaction is classified as a sale, with the SEC data labeling the direction as “sell” and the acquired/disposed code as a disposition. No purchase transactions are included in this Form 4/A.

Clean Harbors Inc Co-CEO Eric W. Gerstenberg reported selling 2,500 shares of common stock on 2026-02-23 in a sale classified as an open market or private transaction at $279.86 per share.

Filing Impact

(Neutral)

Filing Sentiment

(Negative)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

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Form Type

4/A

Rhea-AI Filing Summary

Clean Harbors Inc Co-CEO Eric W. Gerstenberg reported selling 2,500 shares of common stock on 2026-02-23 in a sale classified as an open market or private transaction at $279.86 per share. Following the sale, he directly holds 64,000 shares, with a footnote indicating this filing corrects the total number of shares held.

Insider Trade Summary

Net Seller: 2,500 shares

Net Sell 1 txn

Insider GERSTENBERG ERIC W

Role CO-CEO

Sold 2,500 shs ($700K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^F1	2,500	$279.86	$700K

Holdings After Transaction: Common Stock — 64,000 shares (Direct)

Footnotes (1)

F1. Correction to Total Number of Shares Held.

Key Figures

Shares sold: 2,500 shares Sale price per share: $279.86 per share Shares held after transaction: 64,000 shares

3 metrics

Shares sold 2,500 shares Common stock sale on 2026-02-23 by Co-CEO Eric W. Gerstenberg

Sale price per share $279.86 per share Price for the 2,500 shares of common stock sold

Shares held after transaction 64,000 shares Directly owned common shares following the reported sale and correction

FAQ

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

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

Clean Harbors Co-CEO Eric W. Gerstenberg reported a sale of 2,500 shares of common stock on 2026-02-23, categorized as an open market or private transaction at a specified per-share price.

How many Clean Harbors (CLH) shares did the Co-CEO sell and at what price?

Eric W. Gerstenberg sold 2,500 shares of Clean Harbors common stock at $279.86 per share. The transaction is labeled as a sale in open market or private transaction in the filing data.

How many Clean Harbors (CLH) shares does the Co-CEO hold after this transaction?

After the reported sale, Eric W. Gerstenberg directly holds 64,000 shares of Clean Harbors common stock. A related footnote specifies this filing is a correction to the total number of shares held.

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

The amendment notes a “Correction to Total Number of Shares Held.” This indicates the primary change is to the post-transaction share balance rather than the basic mechanics of the reported sale itself.

Is the reported Clean Harbors (CLH) transaction a buy or a sell by the Co-CEO?

The transaction is classified as a sale, with the SEC data labeling the direction as “sell” and the acquired/disposed code as a disposition. No purchase transactions are included in this Form 4/A.

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

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Accepted by SEC EDGAR 08/14/2026 - 09:13 AM EDT

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)
02/23/2026

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)
02/24/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	02/23/2026		S		2,500	D	$279.86	64,000⁽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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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)

Source: View Original Filing on SEC EDGAR