Clean Harbors Co-CEO reports tax-related share withholding

CLEAN HARBORS INC executive Eric W. Gerstenberg, Co-CEO, reported a disposition of 564 shares of common stock on 2026-07-01 coded as a payment of tax liability by withholding securities.

Rhea-AI Filing Summary

CLEAN HARBORS INC executive Eric W. Gerstenberg, Co-CEO, reported a disposition of 564 shares of common stock on 2026-07-01 coded as a payment of tax liability by withholding securities. The shares were valued at $290.74 per share, and his directly held stake after this event is 59,293 shares. A footnote clarifies the transaction represents tax withholding upon vesting under Rule 16b-3, and another footnote corrects the reported total number of shares held.

Insider Trade Summary

Tax Withholding: 564 shares

Tax Withholding 1 txn

Insider GERSTENBERG ERIC W

Role CO-CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	564	$290.74	$164K

Holdings After Transaction: Common Stock — 59,293 shares (Direct)

Footnotes (2)

1. F1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3.
2. F2. Correction to Total Number of Shares Held.

Key Figures

Shares withheld for taxes: 564 shares Per-share value: $290.74 per share Shares held after transaction: 59,293 shares +2 more

5 metrics

Shares withheld for taxes 564 shares Common stock disposed of on 2026-07-01 as tax-withholding incident to vesting

Per-share value $290.74 per share Value applied to the 564 shares used to pay tax liability

Shares held after transaction 59,293 shares Directly owned CLEAN HARBORS INC common stock following the 2026-07-01 disposition

Transaction date 2026-07-01 Date of tax-withholding disposition of common stock

Code F shares 564 shares Shares reported under transaction code F for payment of tax liability

Key Terms

Rule 16b3, Payment of tax liability by withholding of securities, Common Stock, transaction code F

4 terms

Rule 16b3 regulatory

"withholding of securities incident to vesting of securities in accordance with Rule 16b3"

Payment of tax liability by withholding of securities financial

"Payment of tax liability by withholding of securities incident to vesting"

Common Stock financial

"security_title: Common Stock, transaction of 564.0000 shares"

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.

transaction code F financial

"transaction_code: F, Payment of tax liability by delivering or withholding securities"

FAQ

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

What insider transaction did CLEAN HARBORS INC (CLH) report for Eric W. Gerstenberg?

Eric W. Gerstenberg reported a disposition of 564 shares of CLEAN HARBORS INC common stock on 2026-07-01. The filing describes it as tax-related withholding of shares upon vesting, not an open-market sale.

At what price were Eric Gerstenberg’s CLH shares withheld for tax purposes?

The 564 shares of CLEAN HARBORS INC common stock were valued at $290.74 per share. This price is used to determine the payment of tax liability via share withholding incident to vesting.

How many CLEAN HARBORS INC (CLH) shares does Eric Gerstenberg hold after this transaction?

After the tax-withholding disposition, Eric Gerstenberg directly holds 59,293 shares of CLEAN HARBORS INC common stock. A footnote in the filing states this figure also reflects a correction to the previously reported total.

Was Eric Gerstenberg’s CLH transaction an open-market sale?

No. The transaction is coded F and footnoted as payment of tax liability by withholding of securities upon vesting under Rule 16b-3, indicating tax withholding rather than a discretionary open-market sale.

What does the Rule 16b-3 reference mean in the CLH Form 4/A?

The filing notes payment of tax liability by withholding shares incident to vesting in accordance with Rule 16b-3. This indicates the transaction relates to equity compensation vesting, not a voluntary trade in the market.

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

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Available on EDGAR 08/14/2026 - 09:24 AM Accepted by SEC EDGAR 08/14/2026 - 09:23 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)
07/01/2026

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)
07/06/2026

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	07/01/2026		F		564(1)	D	$290.74	59,293(2)	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. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3.

2. 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)