Clean Harbors (CLH) director trims stake with 789-share sale at $314.01

Rhea-AI Filing Summary

Clean Harbors Inc director Andrea Robertson reported selling 789 shares of Common Stock on 2026-08-03 at $314.0100 per share in a sale described as an open market or private transaction. After this trade, she directly owns 8,979 shares of Clean Harbors common stock. The transaction is not indicated as being made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 789 shares

Net Sell 1 txn

Insider Robertson Andrea

Role Director

Sold 789 shs ($248K)

Type	Security	Shares	Price	Value
Sale	Common Stock	789	$314.01	$248K

Holdings After Transaction: Common Stock — 8,979 shares (Direct)

Key Figures

Shares sold: 789 shares Sale price per share: $314.0100 per share Shares owned after transaction: 8,979 shares +1 more

4 metrics

Shares sold 789 shares Common Stock sold by director Andrea Robertson on 2026-08-03

Sale price per share $314.0100 per share Per-share price for the sale of 789 shares of Common Stock

Shares owned after transaction 8,979 shares Direct Common Stock holdings following the reported sale

Net shares sold 789 shares Net-sell direction from insider transaction summary

Key Terms

Common Stock, Sale in open market or private transaction, Rule 10b5-1

3 terms

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Sale in open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

Rule 10b5-1 regulatory

"Rule 10b5-1 trading plan checkbox (aff_10b5_one)"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

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 08/03/2026 - 12:05 PM Accepted by SEC EDGAR 08/03/2026 - 12:04 PM Learn about SEC filing dates

FAQ

What insider transaction did Clean Harbors (CLH) director Andrea Robertson report?

Andrea Robertson reported selling 789 shares of Clean Harbors common stock on 2026-08-03 at $314.0100 per share. Following this open market or private transaction, she directly holds 8,979 shares of Clean Harbors common stock.

At what price were the Clean Harbors (CLH) shares sold by Andrea Robertson?

The reported sale was executed at $314.0100 per share for 789 shares of Clean Harbors common stock. This per-share price comes from a transaction described as a sale in an open market or private transaction on 2026-08-03.

How many Clean Harbors (CLH) shares does Andrea Robertson own after the reported sale?

After the transaction, Andrea Robertson directly owns 8,979 shares of Clean Harbors common stock. This post-transaction holding reflects the sale of 789 shares on 2026-08-03 in an open market or private transaction.

Was the Andrea Robertson sale in Clean Harbors (CLH) under a Rule 10b5-1 plan?

The reported transaction is not indicated as being made under a Rule 10b5-1 trading plan. The Rule 10b5-1 checkbox associated with this sale is shown as unchecked, suggesting it was not executed pursuant to a pre-arranged trading plan.

What is the nature of the insider transaction reported for Clean Harbors (CLH)?

The transaction is classified as a sale of Common Stock, specifically a “Sale in open market or private transaction.” It involved 789 shares at $314.0100 per share, leaving the director with 8,979 shares directly owned afterward.

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^*

Robertson Andrea

(Last) (First) (Middle)

150 OCEAN LANE DRIVE, APT 3E

(Street)

KEY BISCAYNE FLORIDA 33149

(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)
08/03/2026

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	08/03/2026		S		789	D	$314.01	8,979	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:

	/s/ Andrea Robertson	08/03/2026
	** 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)