[Form 4] Clean Harbors, Inc Insider Trading Activity

Rhea-AI Filing Summary

On July 3 2025, Rush Street Interactive, Inc. (NYSE: RSI) filed a Form 144 stating that Mattias Stetz intends to sell 25,000 common shares through Merrill Lynch, Pierce, Fenner & Smith Inc. at an aggregate market value of $375,000. With 94,555,182 shares outstanding, the planned sale equals roughly 0.03 % of total shares, indicating a modest potential impact on the public float.

The filing identifies the shares as originating from equity-award grants received on 26 Mar 2024, 7 Jan 2025 and 26 Mar 2025, each acquired for cash consideration. Additional disclosure shows that Stetz has already disposed of 79,900 shares in the preceding three months, generating gross proceeds of about $1.03 million across six separate transactions, the largest being 25,000 shares on 1 Jul 2025.

Form 144 serves solely as advance notice; execution of the full amount is not guaranteed. Nonetheless, continued insider selling—albeit small relative to shares outstanding—can influence investor sentiment and invites scrutiny of management’s outlook.

Insights

Securities Analyst

TL;DR: Insider plans new 25 K-share sale after 80 K recent disposals; modest size limits price impact but flags sentiment.

The Form 144 signals a continuation of insider selling by Mattias Stetz, who has already liquidated nearly 80 K shares (~$1.03 M) in the last quarter. The additional 25 K shares represent only 0.03 % of RSI’s 94.6 M outstanding shares, so liquidity risk is negligible. However, serial sales can be interpreted negatively by the market, especially in absence of offsetting insider purchases. Because the quantities are immaterial to float and no operational data accompany the filing, I view the disclosure as neutral to slightly negative in impact.

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^*

Underwood Rebecca

(Last) (First) (Middle)

42 LONGWATER DR

(Street)

NORWELL MA 02061

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CLEAN HARBORS INC [ CLH ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRESIDENT & EVP FACILITIES

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	07/01/2025		F		1,051(1)	D	$229.55	17,335	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. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3.

	/s/ Rebecca Underwood	07/03/2025
	** 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).
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FAQ

Why did Rush Street Interactive (RSI) file Form 144 on July 3 2025?

The filing notifies the SEC and investors that insider Mattias Stetz may sell up to 25,000 common shares.

How many RSI shares does Mattias Stetz plan to sell and what is the value?

He plans to sell 25,000 shares with an aggregate market value of $375,000.

How many RSI shares has Mattias Stetz sold in the past three months?

The Form 144 lists 79,900 shares sold between April 9 and July 1 2025 for gross proceeds of about $1.03 million.

What percentage of RSI’s outstanding shares does the planned sale represent?

With 94,555,182 shares outstanding, the 25,000-share sale is approximately 0.03 % of total shares.

Who is the broker handling the proposed RSI share sale?

Merrill Lynch, Pierce, Fenner & Smith Inc. is listed as the broker executing the transaction.