KOP

SEC source: 0000950170-24-027388 · 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

F1 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.00 to $53.95, 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: 0000950170-24-027388 · ownership.xml · nonDerivative · entry 2

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: 0000950170-24-027388 · ownership.xml · nonDerivative · entry 1

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 323,080.4007

SEC source: 0000950170-24-027385 · ownership.xml · derivative · entry 11

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,716 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.

F6 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-027385 · ownership.xml · derivative · entry 10

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 816 shares

Expires 2028-03-02

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.

F6 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-027385 · ownership.xml · derivative · entry 9

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 956 shares

Expires 2027-03-03

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.

F6 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 6

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,969

F3 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.42 to $53.70, 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: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 5

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,685

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: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 4

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,969

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.55 to $53.59, 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: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 3

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,785

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: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 2

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,969

F1 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.55 to $53.85, 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: 0000950170-24-027385 · ownership.xml · nonDerivative · entry 1

Dowd Joseph P · CIK 0001553647 · VP, Zero Harm

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,925

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: 0000950170-24-026130 · ownership.xml · derivative · entry 3

Apostolou Stephanie L · CIK 0001806249 · General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130

Underlying: Common Stock · 26 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-026130 · ownership.xml · nonDerivative · entry 2

Apostolou Stephanie L · CIK 0001806249 · General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,539

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: 0000950170-24-026130 · ownership.xml · nonDerivative · entry 1

Apostolou Stephanie L · CIK 0001806249 · General Counsel & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,327

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: 0000950170-24-026175 · ownership.xml · derivative · entry 3

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80

Underlying: Common Stock · 22 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-026175 · ownership.xml · nonDerivative · entry 2

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,466

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: 0000950170-24-026175 · ownership.xml · nonDerivative · entry 1

Pearce Bradley A · CIK 0001776180 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,130

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: 0000950170-24-026192 · ownership.xml · derivative · entry 3

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 141

Underlying: Common Stock · 26 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-026192 · ownership.xml · nonDerivative · entry 2

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,273

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: 0000950170-24-026192 · ownership.xml · nonDerivative · entry 1

Smith Jimmi Sue · CIK 0001684691 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,085

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: 0000950170-24-026233 · ownership.xml · derivative · entry 23

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,203

Underlying: Common Stock · 1,445 shares

Expires 2032-01-04

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.

F11 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-026233 · ownership.xml · derivative · entry 22

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,062

Underlying: Common Stock · 3,937 shares

Expires 2031-01-04

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.

F11 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-026233 · ownership.xml · derivative · entry 21

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,159

Underlying: Common Stock · 1,728 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.

F11 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-026233 · ownership.xml · derivative · entry 20

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,780

Underlying: Common Stock · 2,229 shares

Expires 2028-03-02

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.

F11 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-026233 · ownership.xml · derivative · entry 19

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,777

Underlying: Common Stock · 1,375 shares

Expires 2027-03-03

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.

F11 · derivative.exercise_date: Stock options vested in annual installments of 25 percent over four years.

SEC source: 0000950170-24-026233 · ownership.xml · derivative · entry 18

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 324

Underlying: Common Stock · 35 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 granted on March 3, 2020. 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 granted on March 3, 2020. 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 granted on March 3, 2020. 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 granted on March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 17

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

F9 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $55.16 to $55.64 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 16

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,421.738

F6 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $54.00 to $54.98 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 15

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 112,636.738

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.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 14

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

F8 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $55.00 to $55.64 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 13

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,441.738

F4 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $54.00 to $54.99 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 12

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,128.738

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.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 11

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

F7 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $55.55 to $55.64 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 10

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,389.738

F6 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $54.00 to $54.98 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 9

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 112,919.738

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.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 8

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

F5 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $55.01 to $55.64 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 7

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,491.738

F4 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $54.00 to $54.99 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 6

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 113,420.738

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.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 5

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 4

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,291.738

F3 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $54.00 to $54.71 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 price.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 3

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 112,566.738

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.

SEC source: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 2

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,191.738

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: 0000950170-24-026233 · ownership.xml · nonDerivative · entry 1

Sullivan James A. · CIK 0001450800 · President and COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 112,288.738

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.

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: 0000950170-24-026161 · ownership.xml · derivative · entry 3

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 917

Underlying: Common Stock · 92 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. 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 March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

SEC source: 0000950170-24-026161 · ownership.xml · nonDerivative · entry 2

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 324,942.4007

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: 0000950170-24-026161 · ownership.xml · nonDerivative · entry 1

BALL M LEROY · CIK 0001229771 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 327,824.4007

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.

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: 0000950170-24-026216 · ownership.xml · derivative · entry 11

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,729

Underlying: Common Stock · 223 shares

Expires 2032-01-04

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 four years.

SEC source: 0000950170-24-026216 · ownership.xml · derivative · entry 10

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,494

Underlying: Common Stock · 225 shares

Expires 2031-01-04

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 four years.

SEC source: 0000950170-24-026216 · ownership.xml · derivative · entry 9

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125

Underlying: Common Stock · 13 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.

F4 · derivative.exercise_price: These DERs were released in connection with the vesting of RSUs granted on March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F4 · shares: These DERs were released in connection with the vesting of RSUs granted on March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F4 · derivative.exercise_date: These DERs were released in connection with the vesting of RSUs granted on March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

F4 · derivative.expiration_date: These DERs were released in connection with the vesting of RSUs granted on March 3, 2020. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.