Koppers Holdings (KOP) reports 245 new dividend equivalent rights for officer

Rhea-AI Filing Summary

Koppers Holdings Inc. officer Stephanie L. Apostolou, who serves as Chief Legal&Sus Officer & Sec., reported an equity-related transaction. On 12/16/2025, she was credited 245 dividend equivalent rights (DERs), a type of derivative security that tracks the value of Koppers common stock, at a price of $0 per right.

These DERs accrued in connection with additional time-based restricted stock units (RSUs) and performance-based stock units (PSUs) previously granted on January 4, 2022, January 4, 2023, January 4, 2024, January 3, 2025 (for RSUs), and January 4, 2023 (for PSUs). Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock. Following this accrual, she beneficially owned 349 dividend equivalent rights directly.

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^*

Apostolou Stephanie L

(Last) (First) (Middle)

436 SEVENTH AVENUE

(Street)

PITTSBURGH PA 15219

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Koppers Holdings Inc. [ KOP ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal&Sus Officer & Sec.

3. Date of Earliest Transaction (Month/Day/Year)
12/16/2025

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

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
Dividend Equivalent Rights	(1)	12/16/2025		A		245		(1)	(1)	Common Stock	245	$0	349	D

Explanation of Responses:

1. The dividend equivalent rights ("DERs") accrued with respect to additional time-based and performance-based restricted stock units ("RSUs" and "PSUs", respectively) credited to the reporting person. Of this total, 208 DERs accrued with respect to RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025, and 37 DERs accrued with respect to PSUs granted on January 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

Remarks:

	Stephanie L. Apostolou	12/17/2025
	** 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).
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.

FAQ

What insider transaction did Koppers (KOP) report for Stephanie L. Apostolou?

Koppers reported that officer Stephanie L. Apostolou was credited 245 dividend equivalent rights (DERs) on 12/16/2025 at a price of $0 per right.

How many Koppers derivative securities does Stephanie L. Apostolou own after this Form 4 transaction?

After the reported transaction, Stephanie L. Apostolou beneficially owned 349 derivative securities (dividend equivalent rights), held in direct ownership.

What are dividend equivalent rights (DERs) in the Koppers (KOP) Form 4?

The filing states that each dividend equivalent right (DER) is the economic equivalent of one share of Koppers Holdings Inc. common stock.

Which Koppers equity awards generated the 245 new dividend equivalent rights?

Of the 245 DERs, 208 accrued with respect to RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025, and 37 accrued with respect to PSUs granted on January 4, 2023.

What is Stephanie L. Apostolous role at Koppers Holdings Inc. (KOP)?

The Form 4 identifies Stephanie L. Apostolou as an officer of Koppers Holdings Inc., with the title Chief Legal&Sus Officer & Sec.

On what date did the reported Koppers (KOP) insider transaction occur?

The earliest transaction date reported for this Form 4 is 12/16/2025, which is also listed as the transaction date in the derivative securities table.