Clean Harbors director granted 652 restricted shares

Welch John R. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Welch John R. reported acquisition or exercise transactions in this Form 4 filing.

Clean Harbors, Inc. director John R. Welch received a grant of 652 shares of restricted common stock as compensation. The award was granted at $0.00 per share and will vest 100% on the date of the next annual meeting of shareholders. Following this grant, Welch directly owns 10,889 shares of Clean Harbors common stock.

Insider Trade Summary

Grant/Award: 652 shares

Grant/Award 1 txn

Insider Welch John R.

Role Director

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

Holdings After Transaction: Common Stock — 10,889 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: $0.00 per share Post-grant holdings: 10,889 shares

3 metrics

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

Grant price $0.00 per share Equity compensation, not an open-market purchase

Post-grant holdings 10,889 shares Total common stock directly owned after award

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 insider transaction did Clean Harbors (CLH) report for John R. Welch?

Clean Harbors reported that director John R. Welch received a grant of 652 shares of restricted common stock. The award was part of his director compensation and did not involve an open-market purchase or sale at a cash price.

How many Clean Harbors (CLH) shares did John R. Welch receive in this grant?

John R. Welch received 652 shares of restricted common stock. These shares were awarded at a stated price of $0.00 per share as equity compensation for his board service, rather than through a market transaction or personal cash investment.

When do John R. Welch’s new restricted shares in Clean Harbors (CLH) vest?

The 652 restricted shares granted to John R. Welch vest 100% on the date of the next annual meeting of shareholders. Until that vesting date, the shares are subject to the award’s restrictions described in the Form 4 footnote.

How many Clean Harbors (CLH) shares does John R. Welch hold after this Form 4 transaction?

After the award, John R. Welch directly owns 10,889 shares of Clean Harbors common stock. This total reflects his holdings following the 652-share restricted stock grant reported in the Form 4 filing with the SEC.

Was the Clean Harbors (CLH) Form 4 transaction a market buy or sell?

No, the Form 4 shows a grant coded as an acquisition (A), not a market trade. The 652 shares of restricted stock were awarded as compensation to a non-employee director, rather than purchased or sold on the open market.

Why did Clean Harbors (CLH) grant restricted stock to John R. Welch?

The filing describes the 652-share award as restricted stock granted to a non-employee director. Such grants are a common form of equity compensation, aligning a director’s interests with shareholders by providing stock that vests over a defined service period.

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

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Accepted by SEC EDGAR 05/22/2026 - 11:50 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^*

Welch John R.

(Last) (First) (Middle)

975 MEMORIAL DRIVE

APT 611

(Street)

CAMBRIDGE MASSACHUSETTS 02138

(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	10,889	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 R. Welch	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)