Stephanie L. Apostolou - 16 Dec 2025 Form 4 Insider Report for Koppers Holdings Inc. (KOP)

Role: Chief Legal&Sus Officer & Sec.
Signature: Stephanie L. Apostolou
Issuer symbol: KOP
Transactions as of: 16 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 17 Dec 2025, 18:10:15 UTC
Previous filing: 07 Jan 2025
Next filing: 06 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Apostolou Stephanie L	Chief Legal&Sus Officer & Sec.	436 SEVENTH AVENUE, PITTSBURGH	Stephanie L. Apostolou	17 Dec 2025	0001806249

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	KOP	Dividend Equivalent Rights	Award	$0	+245	+236%	$0.000000	349	16 Dec 2025	Common Stock	245		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.

Content

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.