Stephen G. Lucas - 16 Dec 2025 Form 4 Insider Report for Koppers Holdings Inc. (KOP)

Role: SVP, Culture and Engagement
Signature: /s/ Stephanie L. Apostolou, Attorney in Fact
Issuer symbol: KOP
Transactions as of: 16 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 17 Dec 2025, 18:01:26 UTC
Previous filing: 14 Apr 2025
Next filing: 06 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lucas Stephen G	SVP, Culture and Engagement	436 SEVENTH AVENUE, PITTSBURGH	/s/ Stephanie L. Apostolou, Attorney in Fact	17 Dec 2025	0001919175

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	+169	+260%	$0.000000	234	16 Dec 2025	Common Stock	169		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, 142 DERs accrued with respect to RSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025, and 27 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, 142 DERs accrued with respect to RSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025, and 27 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.