Clean Harbors (CLH) EVP reports 359-share tax withholding on vested stock

Filing Impact

(Moderate)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

CLEAN HARBORS INC executive Gabriel M. Sharon reported a small tax-related share disposition. On the reported date, 359 shares of Common Stock were withheld at a price of $290.74 per share to cover tax liabilities tied to vesting of equity awards.

After this tax-withholding transaction, Sharon directly holds 20,706 shares of CLEAN HARBORS INC common stock. The filing notes that the withholding was conducted in accordance with Rule 16b-3, indicating it was an administrative, compensation-related event rather than an open-market trade.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Gabriel Sharon M.

Role EVP/CIO (CHESI)

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	359	$290.74	$104K

Holdings After Transaction: Common Stock — 20,706 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares withheld for taxes: 359 shares Withholding price per share: $290.74 per share Shares held after transaction: 20,706 shares

3 metrics

Shares withheld for taxes 359 shares Tax-withholding disposition on Common Stock

Withholding price per share $290.74 per share Value used for 359 withheld shares

Shares held after transaction 20,706 shares Direct holdings after tax withholding

Key Terms

tax-withholding disposition, Rule 16b3, Common Stock, Form 4

4 terms

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition" for 359 shares of Common Stock"

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 16b3 regulatory

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

Common Stock financial

"security_title: "Common Stock" involved in the Form 4 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.

Form 4 regulatory

"INSIDER FILING DATA (Form 4) describing the insider transaction details"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/06/2026 - 03:14 PM Accepted by SEC EDGAR 07/06/2026 - 03:13 PM

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^*

Gabriel Sharon M.

(Last)

(First)

(Middle)

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)
	EVP/CIO (CHESI)

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)
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	07/01/2026		F		359⁽¹⁾	D	$290.74	20,706	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. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3

	/s/ Sharon M. Gabriel	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did CLEAN HARBORS (CLH) report for Gabriel M. Sharon?

CLEAN HARBORS reported that executive Gabriel M. Sharon had 359 common shares withheld to cover tax liabilities on vested equity. This was an administrative tax-withholding event, not an open-market buy or sell transaction, and was conducted under Rule 16b-3.

How many CLEAN HARBORS (CLH) shares were involved in the latest Form 4 filing?

The Form 4 shows 359 shares of CLEAN HARBORS common stock were withheld. These shares were used to satisfy tax obligations triggered by vesting of equity awards, rather than being sold on the open market to third-party investors.

What is Gabriel M. Sharon’s CLEAN HARBORS (CLH) shareholding after this transaction?

Following the tax-withholding transaction, Gabriel M. Sharon directly holds 20,706 shares of CLEAN HARBORS common stock. This post-transaction figure reflects his remaining equity position after 359 shares were withheld to cover taxes on vested stock-based compensation.

Was the CLEAN HARBORS (CLH) insider transaction an open-market sale or purchase?

The transaction was not an open-market sale or purchase. It was a tax-withholding disposition, where 359 shares were withheld by the company to cover tax liabilities when equity awards vested, as permitted under Rule 16b-3 for compensation-related transactions.

Why were CLEAN HARBORS (CLH) shares withheld from Gabriel M. Sharon?

Shares were withheld to pay tax liabilities arising from the vesting of securities granted to Gabriel M. Sharon. Instead of paying taxes in cash, 359 CLEAN HARBORS shares were retained by the company to satisfy the obligation, a common practice for equity compensation.

What does Rule 16b-3 mean for this CLEAN HARBORS (CLH) Form 4 transaction?

Rule 16b-3 allows company insiders to handle equity compensation transactions, such as tax-withholding, without triggering insider trading concerns. In this case, the 359 withheld shares reflect an approved, compensation-related mechanism rather than discretionary trading in CLEAN HARBORS stock.