Clean Harbors director awarded 652 restricted shares

PRESTON JOHN T reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

PRESTON JOHN T reported acquisition or exercise transactions in this Form 4 filing.

Clean Harbors Inc. director John T. Preston reported an equity compensation grant rather than an open-market trade. On May 20, 2026, he received an award of 652 shares of Common Stock as restricted stock, with no cash paid per share. According to the footnote, this award will vest 100% on the date of the next annual meeting of shareholders. Following the grant, Preston directly holds 7,044 shares of Clean Harbors common stock.

Insider Trade Summary

Grant/Award: 652 shares

Grant/Award 1 txn

Insider PRESTON JOHN T

Role Director

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

Holdings After Transaction: Common Stock — 7,044 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 per share: $0.0000 per share Shares held after transaction: 7,044 shares

3 metrics

Restricted stock grant 652 shares Award of restricted Common Stock on May 20, 2026

Grant price per share $0.0000 per share Reported transaction price for the stock award

Shares held after transaction 7,044 shares Total direct holdings following the grant

Key Terms

restricted stock, non-employee director, annual meeting of shareholders

3 terms

restricted stock financial

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

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 of the next annual meeting of shareholders."

annual meeting of shareholders financial

"Award of restricted stock to non-employee director 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.

FAQ

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

What did Clean Harbors (CLH) director John T. Preston report in this Form 4?

Director John T. Preston reported receiving a grant of restricted common stock. The Form 4 shows an award of 652 shares as equity compensation, not an open-market purchase or sale, increasing his directly held Clean Harbors shares to 7,044 after the transaction.

How many Clean Harbors (CLH) shares were granted to John T. Preston?

John T. Preston received a grant of 652 shares of Clean Harbors common stock. These shares were awarded as restricted stock with a reported price of $0.0000 per share, reflecting a compensation grant rather than a market transaction for cash consideration.

What are the vesting terms of John T. Preston’s restricted stock in Clean Harbors (CLH)?

The restricted stock award to John T. Preston vests 100% on the date of the next annual meeting of shareholders. Until that vesting date, the 652 granted shares are restricted stock, as described in the footnote to the Form 4 insider filing.

How many Clean Harbors (CLH) shares does John T. Preston own after this grant?

After the restricted stock grant, John T. Preston directly holds 7,044 shares of Clean Harbors common stock. This total includes the newly awarded 652 restricted shares reported in the Form 4, which will vest at the next annual shareholder meeting.

Was John T. Preston’s Clean Harbors (CLH) transaction a market buy or sell?

The transaction was not a market buy or sell. The Form 4 lists code “A” for a grant, award, or other acquisition, indicating a restricted stock compensation award of 652 shares to non-employee director John T. Preston, at a reported price of $0.0000 per share.

Why did Clean Harbors (CLH) grant restricted stock to John T. Preston?

The footnote explains that the 652-share grant is an award of restricted stock to a non-employee director. It vests fully at the next annual meeting of shareholders, reflecting standard equity compensation rather than a discretionary open-market transaction by the director.

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

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Accepted by SEC EDGAR 05/22/2026 - 11:26 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^*

PRESTON JOHN T

(Last) (First) (Middle)

225 WARD STREET

(Street)

HINGHAM MASSACHUSETTS 02043

(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	7,044	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/ John T. Preston	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)