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Clean Harbors (NYSE: CLH) EVP/CIO Gabriel reports new stock awards and tax share withholding

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Clean Harbors executive Sharon M. Gabriel, EVP/CIO (CHESI), reported several stock transactions in early February 2026. On February 1, 2026, she received two awards of common stock: 2,073 shares from a performance-based restricted stock award and 566 shares from a time-based restricted stock award, both at $0 per share.

The performance-based award will vest 50% on March 15, 2028 and 50% on March 15, 2029, depending on meeting goals for the period from January 1, 2027 through December 31, 2027. The time-based award vests 25% each on February 1 of 2027, 2028, 2029, and 2030.

On February 2, 2026, 508 shares of common stock were withheld at $259.91 per share to cover tax liabilities upon vesting, in accordance with Rule 16b-3. After these transactions, Gabriel directly owned 26,733 common shares of Clean Harbors.

Positive

  • None.

Negative

  • None.
Insider Gabriel Sharon M.
Role EVP/CIO (CHESI)
Type Security Shares Price Value
Tax Withholding Common Stock 508 $259.91 $132K
Grant/Award Common Stock 2,073 $0.00 --
Grant/Award Common Stock 566 $0.00 --
Holdings After Transaction: Common Stock — 26,733 shares (Direct)
Footnotes (1)
  1. Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3. Performance-Based Restricted Stock Award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, depending on achievement of certain goals during the performance period 1/1/2027 through 12/31/2027 Restricted Stock Award vesting as to 25% on February 1, 2027; 25% on February 1, 2028; 25% on February 1, 2029; and 25% on February 1, 2030.
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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*
Gabriel Sharon M.
(Last) (First) (Middle)
42 LONGWATER DRIVE
(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)
EVP/CIO (CHESI)
3. Date of Earliest Transaction (Month/Day/Year)
02/01/2026
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 02/02/2026 F 508(1) D $259.91 26,733 D
Common Stock 02/01/2026 A 2,073(2) A $0 28,806 D
Common Stock 02/01/2026 A 566(3) A $0 29,372 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.
2. Performance-Based Restricted Stock Award that will vest 50% on 3/15/2028 and 50% on 3/15/2029, depending on achievement of certain goals during the performance period 1/1/2027 through 12/31/2027
3. Restricted Stock Award vesting as to 25% on February 1, 2027; 25% on February 1, 2028; 25% on February 1, 2029; and 25% on February 1, 2030.
/s/ Sharon M. Gabriel 02/03/2026
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Clean Harbors (CLH) EVP/CIO Sharon Gabriel report?

Sharon M. Gabriel reported receiving 2,073 performance-based restricted shares and 566 time-based restricted shares on February 1, 2026, and a withholding of 508 shares on February 2, 2026 to cover tax liabilities related to vesting, all in Clean Harbors common stock.

How many Clean Harbors (CLH) shares does Sharon Gabriel own after these Form 4 transactions?

After the reported transactions, Sharon M. Gabriel directly owned 26,733 shares of Clean Harbors common stock. This figure reflects the net position after receiving restricted stock awards on February 1, 2026 and having 508 shares withheld for taxes on February 2, 2026.

What are the vesting terms of Sharon Gabriel’s performance-based restricted stock at Clean Harbors (CLH)?

The performance-based restricted stock award of 2,073 shares will vest 50% on March 15, 2028 and 50% on March 15, 2029, depending on achieving specified goals during the performance period from January 1, 2027 through December 31, 2027 as described in the filing.

When do Sharon Gabriel’s time-based restricted stock awards at Clean Harbors (CLH) vest?

The 566-share time-based restricted stock award vests in four equal installments: 25% on February 1, 2027, 25% on February 1, 2028, 25% on February 1, 2029, and 25% on February 1, 2030, subject to the award’s standard conditions and continued service.

Why were 508 Clean Harbors (CLH) shares withheld in Sharon Gabriel’s Form 4 filing?

The 508 shares were withheld to pay tax liabilities triggered by the vesting of previously granted equity awards. The filing notes this was a payment of tax liability by withholding securities in accordance with Rule 16b-3, at a price of $259.91 per share.

What role does Sharon M. Gabriel hold at Clean Harbors (CLH) in this Form 4?

Sharon M. Gabriel is identified as an officer of Clean Harbors, serving as Executive Vice President and Chief Information Officer (EVP/CIO) of CHESI. She is not listed as a director or 10% owner in this particular Form 4 insider transaction report.