Clean Harbors director receives 652-share stock grant

Willett Robert reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Willett Robert reported acquisition or exercise transactions in this Form 4 filing.

CLEAN HARBORS INC director Robert Willett received a stock-based compensation grant. He was awarded 652 shares of common stock as restricted stock with no cash paid per share. The award vests 100% on the date of the next annual meeting of shareholders and increases his direct holdings to 10,028 shares of common stock.

Insider Trade Summary

Grant/Award: 652 shares

Grant/Award 1 txn

Insider Willett Robert

Role Director

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

Holdings After Transaction: Common Stock — 10,028 shares (Direct)

Footnotes (1)

1. F1. Award of restricted stock to non-employee director vesting 100% upon the date of the next annual meeting of shareholders.

Key Figures

Restricted stock grant: 652 shares Grant price: $0.0000 per share Holdings after grant: 10,028 shares +1 more

4 metrics

Restricted stock grant 652 shares Award to non-employee director Robert Willett

Grant price $0.0000 per share Recorded value for restricted stock award

Holdings after grant 10,028 shares Total direct common stock holdings post-transaction

Vesting event Next annual meeting Award vests 100% on that date

Key Terms

restricted stock, non-employee director, Grant, award, or other acquisition

3 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"

Grant, award, or other acquisition financial

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

FAQ

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

What insider transaction did CLEAN HARBORS INC (CLH) report for Robert Willett?

CLEAN HARBORS INC reported that director Robert Willett received a grant of 652 shares of common stock as restricted stock. The award was recorded at zero cash cost per share and represents stock-based compensation rather than an open-market purchase.

How many CLEAN HARBORS INC (CLH) shares does Robert Willett hold after this Form 4?

After the restricted stock award, Robert Willett directly holds 10,028 shares of CLEAN HARBORS INC common stock. This total includes the newly granted 652 restricted shares, which are subject to vesting at the next annual meeting of shareholders.

What are the vesting terms of Robert Willett’s CLEAN HARBORS INC (CLH) restricted stock?

The 652-share restricted stock award to Robert Willett vests 100% on the date of CLEAN HARBORS INC’s next annual meeting of shareholders. Until that vesting date, the shares are restricted and subject to the award’s terms and conditions.

Was Robert Willett’s CLEAN HARBORS INC (CLH) stock grant a market purchase?

No, the transaction was coded as a grant or award acquisition, not a market purchase. The 652 CLEAN HARBORS INC shares were issued as restricted stock compensation at a recorded price of $0.0000 per share rather than being bought in the open market.

What transaction code was used in Robert Willett’s CLEAN HARBORS INC (CLH) Form 4?

The Form 4 uses transaction code “A,” indicating a grant, award, or other acquisition. This code confirms that Robert Willett’s 652 CLEAN HARBORS INC shares were received as a restricted stock award, not through an open-market buy or sell transaction.

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

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Accepted by SEC EDGAR 05/22/2026 - 11:53 AM 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^*

Willett Robert

(Last) (First) (Middle)

ONE VISION DRIVE

(Street)

NATICK MASSACHUSETTS 01760

(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	10,028	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/ Robert Willett	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)