Clean Harbors (CLH) CFO logs 447-share tax withholding and corrects holdings

Rhea-AI Filing Summary

CLEAN HARBORS INC executive vice president and chief financial officer Eric J. Dugas reported a Form 4/A amendment detailing a code F transaction. On 2026-07-01, 447 shares of common stock were disposed of at $290.74 per share as a payment of tax liability by withholding of securities incident to vesting in accordance with Rule 16b-3. Following this withholding transaction and a correction, Dugas directly held 17,620 shares of common stock.

Insider Trade Summary

Net Seller: 447 shares

Net Sell 1 txn

Insider Dugas Eric J.

Role EVP CHIEF FINANCIAL OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	447	$290.74	$130K

Holdings After Transaction: Common Stock — 17,620 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: 447 shares Withholding price per share: $290.74 per share Shares held after transaction: 17,620 shares

3 metrics

Shares withheld for taxes 447 shares Common stock withheld on 2026-07-01 as payment of tax liability (code F)

Withholding price per share $290.74 per share Price applied to 447-share tax-withholding disposition of common stock

Shares held after transaction 17,620 shares Direct common stock holdings of Eric J. Dugas following the 2026-07-01 transaction and correction

Key Terms

Rule 16b3, Payment of tax liability, withholding of securities

3 terms

Rule 16b3 regulatory

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

Payment of tax liability financial

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

withholding of securities financial

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

FAQ

What insider transaction did CLEAN HARBORS INC (CLH) report for Eric J. Dugas?

CLEAN HARBORS INC reported that CFO Eric J. Dugas had 447 shares of common stock withheld on 2026-07-01 to pay tax liabilities related to vesting, at $290.74 per share, leaving him with 17,620 shares directly held.

Was the CLH Form 4/A transaction by Eric J. Dugas a market sale or a tax withholding?

The Form 4/A for CLH shows a code F transaction that was a payment of tax liability by withholding securities upon vesting under Rule 16b-3, not an open-market sale, affecting 447 shares of common stock.

How many CLEAN HARBORS INC (CLH) shares were involved in Eric J. Dugas’s Form 4/A transaction?

The Form 4/A reports that 447 shares of CLEAN HARBORS INC common stock were withheld at $290.74 per share to satisfy tax obligations associated with vesting, with 17,620 shares shown as directly held after the transaction.

What is Eric J. Dugas’s reported CLH shareholding after the Form 4/A adjustment?

After the 447-share tax-withholding transaction and a correction to prior reporting, Eric J. Dugas is reported as directly holding 17,620 shares of CLEAN HARBORS INC common stock, according to the Form 4/A disclosure and its footnote F2 correction.

What does the correction footnote in the CLH Form 4/A for Eric J. Dugas indicate?

Footnote F2 in the CLH Form 4/A states it is a "Correction to Total Number of Shares Held", clarifying the post-transaction holding figure, which is now reported as 17,620 shares of common stock held directly by Eric J. Dugas.

Did the CLH Form 4/A indicate use of a Rule 10b5-1 trading plan for Eric J. Dugas?

The Form 4/A data for CLH shows the Rule 10b5-1 affirmation box was not checked (aff_10b5_one=false), and the transaction is characterized instead as a tax-liability-related withholding under Rule 16b-3 rather than a pre-arranged trading plan sale.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/14/2026 - 09:09 AM Accepted by SEC EDGAR 08/14/2026 - 09:09 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^*

Dugas Eric J.

(Last) (First) (Middle)

C/O CLEAN HARBORS, 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)
	EVP CHIEF FINANCIAL OFFICER

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		447(1)	D	$290.74	17,620(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 J. Dugas	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)