James A. Sullivan - 26 Feb 2026 Form 4 Insider Report for Koppers Holdings Inc. (KOP)

Role: President and CTO
Signature: /s/ Stephanie L. Apostolou, Attorney in Fact
Issuer symbol: KOP
Transactions as of: 26 Feb 2026
Net transactions value: -$319,854
Form type: 4
Filing time: 02 Mar 2026, 16:11:45 UTC
Previous filing: 06 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sullivan James A.	President and CTO	436 SEVENTH AVENUE, PITTSBURGH	/s/ Stephanie L. Apostolou, Attorney in Fact	02 Mar 2026	0001450800

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	KOP	Common Stock	Award	$0	+19,264	+12%	$0.000000	178,521	26 Feb 2026	Direct	F1
transaction	KOP	Common Stock	Options Exercise	$0	+466	+0.26%	$0.000000	178,987	26 Feb 2026	Direct	F2
transaction	KOP	Common Stock	Tax liability	$319,854	-8,589	-4.8%	$37.24	170,398	26 Feb 2026	Direct	F3

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	+466	+159%	$0.000000	760	26 Feb 2026	Common Stock	466		Direct	F4
transaction	KOP	Dividend Equivalent Rights	Options Exercise	$0	-466	-61%	$0.000000	294	26 Feb 2026	Common Stock	466		Direct	F5

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

Explanation of Responses:

Id	Content
F1	On January 4, 2023, the reporting person was granted performance share units ("PSUs") for which the performance criteria for the measurement period from January 1, 2023 through December 31, 2025 have been satisfied.
F2	Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.
F3	Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of PSUs.
F4	The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.
F5	These DERs were released in connection with the vesting of PSUs granted on January 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.