KOP

SEC source: 0000950170-24-053657 · ownership.xml · nonDerivative · entry 1

Sandifer Andrew D · CIK 0001739998 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,949

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-053636 · ownership.xml · derivative · entry 1

Feng Xudong · CIK 0001463649 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,699.478

Underlying: Common Stock · 2,079 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

SEC source: 0000950170-24-053674 · ownership.xml · derivative · entry 3

Tritch Stephen R · CIK 0001463204 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20 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: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · shares: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-053674 · ownership.xml · nonDerivative · entry 2

Tritch Stephen R · CIK 0001463204 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,270

F2 · security: The reporting person was awarded time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-053674 · ownership.xml · nonDerivative · entry 1

Tritch Stephen R · CIK 0001463204 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,191

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-053683 · ownership.xml · derivative · entry 3

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,405

Underlying: Common Stock · 2,079 shares

Expires not disclosed

F3 · derivative.exercise_price: Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis.

F4 · derivative.exercise_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F4 · derivative.expiration_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

SEC source: 0000950170-24-053683 · ownership.xml · derivative · entry 2

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63.494

Underlying: Common Stock · 20 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: These DERs were released in connection with the vesting of time-based restricted stock units granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · shares: These DERs were released in connection with the vesting of time-based restricted stock units granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: These DERs were released in connection with the vesting of time-based restricted stock units granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.expiration_date: These DERs were released in connection with the vesting of time-based restricted stock units granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-053683 · ownership.xml · nonDerivative · entry 1

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,749

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-053651 · ownership.xml · derivative · entry 3

NEUPAVER ALBERT J · CIK 0001190210 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20 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: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · shares: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-053651 · ownership.xml · nonDerivative · entry 2

NEUPAVER ALBERT J · CIK 0001190210 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,989

F2 · security: The reporting person was awarded time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-053651 · ownership.xml · nonDerivative · entry 1

NEUPAVER ALBERT J · CIK 0001190210 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,910

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-053678 · ownership.xml · nonDerivative · entry 1

Vartanian Nishan J. · CIK 0001564614 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,539

F1 · security: The reporting person was awarded time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-053668 · ownership.xml · derivative · entry 3

TESTONI LOUIS L · CIK 0001576713 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20 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: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · shares: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-053668 · ownership.xml · nonDerivative · entry 2

TESTONI LOUIS L · CIK 0001576713 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,761

F2 · security: The reporting person was awarded time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-053668 · ownership.xml · nonDerivative · entry 1

TESTONI LOUIS L · CIK 0001576713 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,682

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-053645 · ownership.xml · derivative · entry 1

MOTLEY DAVID L · CIK 0001584601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,918

Underlying: Common Stock · 2,079 shares

Expires not disclosed

F1 · derivative.exercise_price: Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

SEC source: 0000950170-24-053641 · ownership.xml · derivative · entry 3

JENSEN TRACI L · CIK 0001533627 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20 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: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · shares: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-053641 · ownership.xml · nonDerivative · entry 2

JENSEN TRACI L · CIK 0001533627 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,214.104

F2 · security: The reporting person was awarded time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-053641 · ownership.xml · nonDerivative · entry 1

JENSEN TRACI L · CIK 0001533627 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,135.104

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

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-044422 · ownership.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104

Underlying: Common Stock · 86 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: These DERs were released in connection with the vesting of RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · shares: These DERs were released in connection with the vesting of RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F3 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-044422 · ownership.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,623

F2 · acquired: Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of time-based restricted stock units ("RSUs").

SEC source: 0000950170-24-044422 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,419

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.

F1 · shares: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

F1 · price: Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis.

SEC source: 0000950170-24-037279 · ownership.xml · derivative · entry 1

Sandifer Andrew D · CIK 0001739998 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Underlying: Common Stock · 20 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037246 · ownership.xml · derivative · entry 2

Feng Xudong · CIK 0001463649 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101.146

Underlying: Common Stock · 20 shares

Expires not disclosed

F4 · derivative.exercise_price: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

SEC source: 0000950170-24-037246 · ownership.xml · derivative · entry 1

Feng Xudong · CIK 0001463649 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81.146

Underlying: Common Stock · 7.967 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F3 · balance_after: Includes 8.365 DERs that inadvertently were not previously reported.

SEC source: 0000950170-24-037256 · ownership.xml · derivative · entry 1

Tritch Stephen R · CIK 0001463204 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Underlying: Common Stock · 20 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037229 · ownership.xml · derivative · entry 2

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83.494

Underlying: Common Stock · 20 shares

Expires not disclosed

F4 · derivative.exercise_price: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F4 · derivative.exercise_date: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F4 · derivative.expiration_date: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037229 · ownership.xml · derivative · entry 1

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63.494

Underlying: Common Stock · 5.652 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F3 · balance_after: Includes 5.934 DERs that inadvertently were not previously reported.

SEC source: 0000950170-24-037289 · ownership.xml · derivative · entry 1

NEUPAVER ALBERT J · CIK 0001190210 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Underlying: Common Stock · 20 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037297 · ownership.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 190

Underlying: Common Stock · 8 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on April 11, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037292 · ownership.xml · derivative · entry 1

JENSEN TRACI L · CIK 0001533627 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Underlying: Common Stock · 20 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037266 · ownership.xml · derivative · entry 1

TESTONI LOUIS L · CIK 0001576713 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20

Underlying: Common Stock · 20 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.exercise_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F1 · derivative.expiration_date: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-037250 · ownership.xml · derivative · entry 2

MOTLEY DAVID L · CIK 0001584601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83.493

Underlying: Common Stock · 20 shares

Expires not disclosed

F4 · derivative.exercise_price: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

SEC source: 0000950170-24-037250 · ownership.xml · derivative · entry 1

MOTLEY DAVID L · CIK 0001584601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63.493

Underlying: Common Stock · 5.651 shares

Expires not disclosed

F1 · derivative.exercise_price: The dividend equivalent rights ("DERs") accrued with respect to additional time-based restricted stock units ("RSUs") credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F2 · derivative.exercise_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F2 · derivative.expiration_date: Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

F3 · balance_after: Includes 5.933 DERs that inadvertently were not previously reported.

SEC source: 0000950170-25-037432 · ownership.xml · derivative · entry 3

WILKERSON SONJA MICHELLE · CIK 0001245155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108.615

Underlying: Common Stock · 20 shares

Expires not disclosed

F5 · derivative.exercise_price: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F6 · shares: This Form 4 amendment is being filed to correctly report in Table II the accrual of 20 DERs to the reporting person with respect to RSUs granted to the reporting person on May 4, 2023. These DERs were inadvertently reported in Table I as the conversion of a derivative security on the reporting person's Form 4 filed May 6, 2024.

F5 · derivative.exercise_date: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F5 · derivative.expiration_date: The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-035415 · ownership.xml · derivative · entry 8

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 14,441 shares

Expires 2030-03-03

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.

F5 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over 4 years.

SEC source: 0000950170-24-035415 · ownership.xml · derivative · entry 7

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,962 shares

Expires 2029-03-06

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.

F5 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over 4 years.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 6

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 55,657.9136

F4 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $54.36 to $54.74, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 5

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 58,852.9136

F3 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.34 to $54.33, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 4

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,098.9136

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.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 3

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 55,657.9136

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $54.36 to $54.69, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 2

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 57,021.9136

F1 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.35 to $54.28, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-035415 · ownership.xml · nonDerivative · entry 1

Hyde Leslie S · CIK 0001349675 · SVP, Chief Sustainability Offi

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,619.9136

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.

SEC source: 0000950170-24-028050 · ownership.xml · derivative · entry 5

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,205

Underlying: Common Stock · 5,000 shares

Expires 2025-03-03

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_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-028050 · ownership.xml · nonDerivative · entry 4

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 320,718.4007

SEC source: 0000950170-24-028050 · ownership.xml · nonDerivative · entry 3

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 323,080.4007

SEC source: 0000950170-24-028050 · ownership.xml · nonDerivative · entry 2

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 323,110.4007

F1 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.43 to $53.42, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-028050 · ownership.xml · nonDerivative · entry 1

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 328,080.4007

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.

SEC source: 0000950170-24-028072 · ownership.xml · nonDerivative · entry 1

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,772

F1 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.12 to $52.54 inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0000950170-24-028091 · ownership.xml · nonDerivative · entry 3

Washington Kevin · CIK 0001932214 · VP, External Relations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,404

F3 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.02 to $53.27, inclusive. The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.