Clean Harbors (NYSE: CLH) director adds 460 shares in open-market buy

Rhea-AI Filing Summary

CLEAN HARBORS INC director Karyn Polito reported an open-market purchase of 460 shares of Common Stock at $295.13 per share. This trade on May 11 increased her direct holdings to 3,475 shares. The amended Form 4 corrects a clerical error in the transaction code.

Insider Trade Summary

Net Buyer: 460 shares ($135,760)

Net Buy 1 txn

Insider Polito Karyn

Role null

Bought 460 shs ($136K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	460	$295.13	$136K

Holdings After Transaction: Common Stock — 3,475 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares purchased: 460 shares Purchase price: $295.13 per share Shares held after transaction: 3,475 shares +1 more

4 metrics

Shares purchased 460 shares Open-market purchase on May 11, 2026

Purchase price $295.13 per share Reported transaction price for Common Stock

Shares held after transaction 3,475 shares Director’s direct Common Stock holdings following purchase

Net buy shares 460 shares Net buy direction per transaction summary

Key Terms

open-market purchase, Form 4/A, transaction code

3 terms

open-market purchase financial

"transaction_action: "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Form 4/A regulatory

"INSIDER FILING DATA (Form 4/A)"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

transaction code regulatory

"Item 3, Transaction Code, edited to correct a clerical error."

Form 4 Insider Transactions: What Each Field Means →

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^*

Polito Karyn

(Last) (First) (Middle)

C/O CLEAN HARBORS, INC.

42 LONGWATER DRIVE

(Street)

NORWELL MASSACHUSETTS 02061

(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)
05/11/2026

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)
05/13/2026

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	05/11/2026		P(1)		460	A	$295.13	3,475	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. Item 3, Transaction Code, edited to correct a clerical error.

	/s/ Karyn Polito	05/14/2026
	** 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)

FAQ

What insider transaction did CLEAN HARBORS INC (CLH) report for Karyn Polito?

CLEAN HARBORS INC director Karyn Polito reported buying 460 shares of Common Stock in an open-market purchase. The shares were acquired at $295.13 each, increasing her directly owned position reported in this filing.

At what price did Karyn Polito buy CLEAN HARBORS INC (CLH) shares?

Karyn Polito bought CLEAN HARBORS INC Common Stock at $295.13 per share. This price reflects the reported transaction value for her 460-share open-market purchase on May 11, as disclosed in the amended Form 4 filing.

How many CLEAN HARBORS INC (CLH) shares does Karyn Polito hold after the transaction?

After the reported transaction, Karyn Polito directly holds 3,475 shares of CLEAN HARBORS INC Common Stock. This post-transaction balance reflects the addition of 460 shares acquired through the open-market purchase described in the Form 4/A.

Was the CLEAN HARBORS INC (CLH) Form 4 filing amended, and why?

Yes. The Form 4 for CLEAN HARBORS INC was amended to correct a clerical error in Item 3, the transaction code. The amendment does not change the reported share amount or price, only the code description for the transaction.

Does the CLEAN HARBORS INC (CLH) Form 4/A show any insider share sales?

No insider share sales are reported in this Form 4/A. The filing shows a single open-market purchase of 460 shares by director Karyn Polito, with no sales or derivative exercises disclosed in the transaction summary.