CLH co-CEO reports 564-share tax withholding

CLEAN HARBORS INC co-CEO Eric W. Gerstenberg reported a small share disposition related to taxes, not an open-market trade.

Rhea-AI Filing Summary

CLEAN HARBORS INC co-CEO Eric W. Gerstenberg reported a small share disposition related to taxes, not an open-market trade. On July 1, 2026, 564 shares of Common Stock were withheld at $290.74 per share to cover tax obligations tied to vesting equity awards under Rule 16b-3.

After this tax-withholding transaction, Gerstenberg directly holds 38,313 shares of CLEAN HARBORS INC Common Stock. This filing reflects routine equity compensation and associated tax settlement rather than a discretionary buy or sell decision in the open market.

Insider Trade Summary

Exercise Price or Tax Liability: 564 shares

Exercise Price or Tax Liability 1 txn

Insider GERSTENBERG ERIC W

Role CO-CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	564	$290.74	$164K

Holdings After Transaction: Common Stock — 38,313 shares (Direct)

Footnotes (1)

1. F1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3

Key Figures

Shares withheld for taxes: 564 shares Withholding price per share: $290.74 per share Shares held after transaction: 38,313 shares

3 metrics

Shares withheld for taxes 564 shares Tax-withholding disposition on Common Stock

Withholding price per share $290.74 per share Value assigned to shares used for tax withholding

Shares held after transaction 38,313 shares Direct Common Stock ownership after July 1, 2026 transaction

Key Terms

tax-withholding disposition, Rule 16b-3, Common Stock

3 terms

tax-withholding disposition financial

"classified as a tax-withholding disposition to cover tax obligations"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Rule 16b-3 regulatory

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

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

Common Stock financial

"564 shares of Common Stock were withheld at $290.74 per share"

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.

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 had 564 shares withheld to cover tax obligations. The shares were related to vesting equity awards and not an open-market trade, making this a routine compensation and tax-settlement event rather than a discretionary sale.

Was the CLH insider transaction by Eric Gerstenberg an open-market sale?

No, the CLH insider activity was not an open-market sale. The Form 4 shows 564 shares withheld to pay tax liabilities upon vesting of equity awards under Rule 16b-3, classified as a tax-withholding disposition rather than a voluntary sale on the stock market.

How many CLH shares were involved in Eric Gerstenberg’s tax-withholding transaction?

The filing shows 564 shares of CLEAN HARBORS Common Stock were used for tax withholding. These shares were withheld at a price of $290.74 per share in connection with vesting equity awards, rather than being actively sold into the open market by the executive.

How many CLEAN HARBORS (CLH) shares does Eric Gerstenberg hold after this Form 4?

After the tax-withholding disposition, Eric Gerstenberg directly holds 38,313 shares of CLEAN HARBORS Common Stock. This post-transaction holding figure comes directly from the Form 4 and helps show that the withholding affected only a small portion of his overall position.

What does Rule 16b-3 mean in the CLH insider Form 4 for Eric Gerstenberg?

Rule 16b-3 allows certain transactions tied to employee benefit plans, like equity award vesting, to be exempt from short-swing profit rules. In this case, the 564-share withholding covered tax liabilities from vesting awards and is treated as a routine compensation-related transaction.

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

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Accepted by SEC EDGAR 07/06/2026 - 03:08 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)
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)

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	38,313	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

	/s/ Eric W. Gerstenberg	07/06/2026
	** 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)