Clean Harbors (CLH) director receives 652-share restricted stock grant

Rhea-AI Filing Summary

Polito Karyn reported acquisition or exercise transactions in this Form 4 filing.

Clean Harbors director Karyn Polito received an equity grant of 652 shares of Common Stock as restricted stock, with no cash paid per share. The award was granted as compensation for service as a non-employee director and vests 100% on the date of the next annual meeting of shareholders. Following this grant, she directly holds 4,127 shares of Clean Harbors common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Polito Karyn

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	652	$0.00	--

Holdings After Transaction: Common Stock — 4,127 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Restricted stock granted: 652 shares Grant price per share: $0.0000 per share Shares held after grant: 4,127 shares +1 more

4 metrics

Restricted stock granted 652 shares Award of restricted stock to non-employee director

Grant price per share $0.0000 per share Equity compensation, no cash consideration

Shares held after grant 4,127 shares Total direct common stock holdings after transaction

Vesting condition 100% at next annual meeting Restricted stock vests upon next shareholders’ annual meeting

Key Terms

restricted stock, non-employee director, annual meeting of shareholders, transaction code "A"

4 terms

restricted stock financial

"Award of restricted stock to non-employee director vesting 100% upon the date"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

non-employee director financial

"Award of restricted stock to non-employee director vesting 100% upon the date"

annual meeting of shareholders regulatory

"vesting 100% upon the date of the next annual meeting of shareholders"

A yearly gathering where a company’s owners (shareholders) vote on key items like electing the board, approving executive pay, and ratifying auditors, and receive updates on performance and strategy. Think of it as an annual town hall for owners: it matters to investors because outcomes and disclosures can affect leadership, corporate direction, dividend and governance policies, and therefore the company’s risk and potential return.

transaction code "A" regulatory

"transaction_code": "A", "transaction_code_description": "Grant, award, or other acquisition"

Form 4 Insider Transactions: What Each Field Means →

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^*

Polito Karyn

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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	05/20/2026		A		652(1)	A	$0	4,127	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. Award of restricted stock to non-employee director vesting 100% upon the date of the next annual meeting of shareholders.

	/s/ Karyrn Polito	05/22/2026
	** 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)

FAQ

What insider transaction did Karyn Polito report for CLH?

Karyn Polito reported receiving an award of 652 shares of Clean Harbors common stock. The shares were granted as restricted stock for her role as a non-employee director, with no cash paid per share, and represent an equity-based compensation grant.

How many Clean Harbors (CLH) shares does Karyn Polito hold after this grant?

After the restricted stock award, Karyn Polito directly holds 4,127 shares of Clean Harbors common stock. This total includes the newly granted 652 shares and reflects her direct ownership position reported in the Form 4 insider filing.

What are the vesting terms of Karyn Polito’s restricted stock in CLH?

The 652-share restricted stock award to Karyn Polito vests 100% on the date of the next annual meeting of shareholders. Until vesting, the shares are subject to restrictions, aligning her compensation with continued board service at Clean Harbors.

Was cash paid for Karyn Polito’s Clean Harbors restricted stock award?

No cash was paid for the award; the transaction price per share is reported as $0.0000. This indicates the 652 restricted shares were granted as equity compensation to Karyn Polito in her capacity as a non-employee director of Clean Harbors.

Is Karyn Polito’s CLH transaction a purchase or a grant of shares?

The transaction is classified as a grant or award, not an open-market purchase. The Form 4 shows transaction code “A,” meaning an acquisition through a grant of 652 restricted shares as director compensation rather than a cash purchase in the market.