KOP

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · nonDerivative · entry 4

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,863.75

F4 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · nonDerivative · entry 3

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,895.75

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F3 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · nonDerivative · entry 2

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,810.75

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · nonDerivative · entry 1

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,321.75

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · derivative · entry 9

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148

Underlying: Common Stock · 240 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F10 · shares: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F10 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F10 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · derivative · entry 8

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,666 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F9 · derivative.exercise_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

F9 · derivative.expiration_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · nonDerivative · entry 4

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,902

F5 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · nonDerivative · entry 3

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,659

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F4 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · nonDerivative · entry 2

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,419

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · nonDerivative · entry 1

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,753

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

F2 · balance_after: Includes 828 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan on March 31, 2025 and June 30, 2025. These acquisitions were exempt under both Rule 16b-3(c) and Rule 16b-3(d).

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · derivative · entry 6

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67

Underlying: Common Stock · 104 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · shares: These DERs were released in connection with the vesting of RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · nonDerivative · entry 3

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,946

F3 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs.

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · nonDerivative · entry 2

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,416

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F2 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · nonDerivative · entry 1

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,312

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · derivative · entry 8

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 126

Underlying: Common Stock · 240 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · shares: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · derivative · entry 7

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,860 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

F8 · derivative.expiration_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · nonDerivative · entry 3

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,050

F4 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · nonDerivative · entry 2

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,744

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F3 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · nonDerivative · entry 1

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,504

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

F2 · balance_after: Includes 790 shares of Koppers Holdings Inc. common stock acquired pursuant to the Koppers Holdings Inc. Employee Stock Purchase Plan on December 31, 2024, March 31, 2025, June 30, 2025, and September 30, 2025. These acquisitions were exempt under both Rule 16b-3(c) and Rule 16b-3(d).

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · derivative · entry 9

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 294

Underlying: Common Stock · 622 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · shares: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · derivative · entry 8

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,442 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

F8 · derivative.expiration_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · nonDerivative · entry 4

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 159,256.738

F4 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · nonDerivative · entry 3

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 172,914.738

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F3 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · nonDerivative · entry 2

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 172,292.738

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · nonDerivative · entry 1

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 159,850.738

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · derivative · entry 9

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 454

Underlying: Common Stock · 2,056 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · shares: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2022, January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · derivative · entry 8

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 64,634 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

F8 · derivative.expiration_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · nonDerivative · entry 4

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 411,339.4007

F4 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · nonDerivative · entry 3

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 451,150.4007

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F3 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · nonDerivative · entry 2

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 449,094.4007

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001315257-26-000002 · wk-form4_1767740678.xml · nonDerivative · entry 1

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 384,460.4007

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · derivative · entry 9

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102

Underlying: Common Stock · 156 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · shares: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F9 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2023, January 4, 2024, and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · derivative · entry 8

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,421 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

F8 · derivative.expiration_date: Represents previously granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied, as reported in Table II above.

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · nonDerivative · entry 4

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,764

F4 · price: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · nonDerivative · entry 3

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,181

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F3 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · nonDerivative · entry 2

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,025

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001919175-26-000002 · wk-form4_1767740884.xml · nonDerivative · entry 1

Lucas Stephen G · CIK 0001919175 · SVP, Culture and Engagement

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,604

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs") on January 5, 2026, which will vest in annual installments of 25 percent over four years.

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · derivative · entry 7

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118

Underlying: Common Stock · 10 shares

Expires not disclosed

F7 · derivative.exercise_price: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.exercise_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.expiration_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · derivative · entry 6

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 316

Underlying: Common Stock · 316 shares

Expires not disclosed

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

F6 · derivative.expiration_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

SEC source: 0002057699-26-000002 · wk-form4_1767740787.xml · derivative · entry 5

Lovalekar Tushar · CIK 0002057699 · VP, Information Technology

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,489

Underlying: Common Stock · 368 shares

Expires not disclosed

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F5 · derivative.exercise_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

F5 · derivative.expiration_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · derivative · entry 7

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 388

Underlying: Common Stock · 39 shares

Expires not disclosed

F8 · derivative.exercise_price: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F8 · derivative.exercise_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F8 · derivative.expiration_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · derivative · entry 6

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,335

Underlying: Common Stock · 1,335 shares

Expires not disclosed

F3 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F7 · derivative.exercise_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

F7 · derivative.expiration_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

SEC source: 0001806249-26-000002 · wk-form4_1767740573.xml · derivative · entry 5

Apostolou Stephanie L · CIK 0001806249 · Chief Legal&Sus Officer & Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,666

Underlying: Common Stock · 1,153 shares

Expires not disclosed

F3 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

F6 · derivative.expiration_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · derivative · entry 5

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 171

Underlying: Common Stock · 3 shares

Expires not disclosed

F6 · derivative.exercise_price: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F6 · derivative.exercise_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F6 · derivative.expiration_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001776180-26-000002 · wk-form4_1767740407.xml · derivative · entry 4

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 357

Underlying: Common Stock · 357 shares

Expires not disclosed

F4 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F5 · derivative.exercise_date: On January 3, 2025, the reporting person was granted performance share units ("PSUs") for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

F5 · derivative.expiration_date: On January 3, 2025, the reporting person was granted performance share units ("PSUs") for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · derivative · entry 6

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 366

Underlying: Common Stock · 38 shares

Expires not disclosed

F7 · derivative.exercise_price: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.exercise_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.expiration_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · derivative · entry 5

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,210

Underlying: Common Stock · 1,210 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

F6 · derivative.expiration_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

SEC source: 0001684691-26-000002 · wk-form4_1767741027.xml · derivative · entry 4

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,860

Underlying: Common Stock · 1,201 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F5 · derivative.exercise_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

F5 · derivative.expiration_date: On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2023 through December 31, 2025 have been satisfied.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · derivative · entry 7

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 916

Underlying: Common Stock · 107 shares

Expires not disclosed

F7 · derivative.exercise_price: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.exercise_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F7 · derivative.expiration_date: The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2023 and January 3, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0001450800-26-000002 · wk-form4_1767741215.xml · derivative · entry 6

Sullivan James A. · CIK 0001450800 · President and CTO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,426

Underlying: Common Stock · 3,426 shares

Expires not disclosed

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.

F6 · derivative.expiration_date: On January 3, 2025, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2025 through December 31, 2025 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2028. If the Company's total shareholder return over the three-year period of January 1, 2025 through December 31, 2027 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number.