WLK

SEC source: 0001209191-23-047818 · doc4.xml · nonDerivative · entry 3

Chao James · CIK 0001299505 · Director · Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,640

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $133.50 to $134.375, inclusive. The reporting person undertakes to provide to Westlake Corporation, any security holder of Westlake Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-047818 · doc4.xml · nonDerivative · entry 2

Chao James · CIK 0001299505 · Director · Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,696

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: 0001209191-23-047818 · doc4.xml · nonDerivative · entry 1

Chao James · CIK 0001299505 · Director · Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,961

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: 0001209191-23-047808 · doc4.xml · derivative · entry 5

Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,988

Underlying: Common Stock · 20,000 shares

Expires 2024-02-14

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_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 14, 2015, 2016 and 2017, respectively.

SEC source: 0001209191-23-047808 · doc4.xml · nonDerivative · entry 3

Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 520.148

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $134.50 to $134.78, inclusive. The reporting person undertakes to provide to Westlake Corporation, any security holder of Westlake Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-047808 · doc4.xml · nonDerivative · entry 2

Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 522,463

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $133.49 to $134.49, inclusive. The reporting person undertakes to provide to Westlake Corporation, any security holder of Westlake Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-047808 · doc4.xml · nonDerivative · entry 1

Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 540,148

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: 0001209191-23-047809 · doc4.xml · derivative · entry 3

Ederington L. Benjamin · CIK 0001588279 · EVP, PEM, GC and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,734 shares

Expires 2027-02-17

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: The stock options are excercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively

SEC source: 0001209191-23-047809 · doc4.xml · nonDerivative · entry 2

Ederington L. Benjamin · CIK 0001588279 · EVP, PEM, GC and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,916

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $134.18 to $134.60, inclusive. The reporting person undertakes to provide to Westlake Corporation, any security holder of Westlake Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-047809 · doc4.xml · nonDerivative · entry 1

Ederington L. Benjamin · CIK 0001588279 · EVP, PEM, GC and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,650

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: 0001209191-23-047678 · doc4.xml · derivative · entry 5

Janssens Thomas J. · CIK 0001834230 · SVP, Ops - PEM & Corp Logistic

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,782

Underlying: Common Stock · 1,370 shares

Expires 2032-02-18

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_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 18, 2023, 2024 and 2025, respectively.

SEC source: 0001209191-23-047678 · doc4.xml · derivative · entry 4

Janssens Thomas J. · CIK 0001834230 · SVP, Ops - PEM & Corp Logistic

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,485 shares

Expires 2028-02-16

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: The stock options are excercisable in three installments of 33%, 33% and 34% on February 16, 2019, 2020 and 2021, respectively.

SEC source: 0001209191-23-047678 · doc4.xml · nonDerivative · entry 3

Janssens Thomas J. · CIK 0001834230 · SVP, Ops - PEM & Corp Logistic

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,531

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $133.82 to $133.93, inclusive. The reporting person undertakes to provide to Westlake Corporation, any security holder of Westlake Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-047678 · doc4.xml · nonDerivative · entry 2

Janssens Thomas J. · CIK 0001834230 · SVP, Ops - PEM & Corp Logistic

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,386

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: 0001209191-23-047678 · doc4.xml · nonDerivative · entry 1

Janssens Thomas J. · CIK 0001834230 · SVP, Ops - PEM & Corp Logistic

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,016

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: 0001209191-23-047684 · doc4.xml · derivative · entry 3

Buesinger Robert F. · CIK 0001488587 · EVP, HIP, IT & Digital

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 8,100 shares

Expires 2030-02-14

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_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 14, 2021, 2022 and 2023, respectively.

SEC source: 0001209191-23-047684 · doc4.xml · nonDerivative · entry 2

Buesinger Robert F. · CIK 0001488587 · EVP, HIP, IT & Digital

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,969

SEC source: 0001209191-23-047684 · doc4.xml · nonDerivative · entry 1

Buesinger Robert F. · CIK 0001488587 · EVP, HIP, IT & Digital

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,069

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: 0001209191-23-047150 · doc4.xml · nonDerivative · entry 1

Chao David Tsung-Hung · CIK 0001726418 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,148

SEC source: 0001209191-23-045784 · doc4.xml · nonDerivative · entry 2

Zoeller Johnathan Stevan · CIK 0001803678 · VP and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,560

F2 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of vesting of the Reporting Person's restricted stock units.

SEC source: 0001209191-23-045784 · doc4.xml · derivative · entry 3

Zoeller Johnathan Stevan · CIK 0001803678 · VP and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 588 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 13, 2021 the reporting person was granted 588 restricted stock units vesting on the second anniversary of the grant date.

F3 · derivative.expiration_date: On August 13, 2021 the reporting person was granted 588 restricted stock units vesting on the second anniversary of the grant date.

SEC source: 0001209191-23-045784 · doc4.xml · nonDerivative · entry 1

Zoeller Johnathan Stevan · CIK 0001803678 · VP and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,704

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045502 · doc4.xml · derivative · entry 4

Chao David Tsung-Hung · CIK 0001726418 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F4 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F4 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045502 · doc4.xml · nonDerivative · entry 1

Chao David Tsung-Hung · CIK 0001726418 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,148

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045503 · doc4.xml · derivative · entry 3

Graff Michael J · CIK 0001457009 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045503 · doc4.xml · nonDerivative · entry 1

Graff Michael J · CIK 0001457009 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,878

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045506 · doc4.xml · derivative · entry 3

Lubel Kimberly S · CIK 0001448219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045506 · doc4.xml · nonDerivative · entry 1

Lubel Kimberly S · CIK 0001448219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,389

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045511 · doc4.xml · derivative · entry 3

Sheets Jeffrey Wayne · CIK 0001447712 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045511 · doc4.xml · nonDerivative · entry 1

Sheets Jeffrey Wayne · CIK 0001447712 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,495

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045509 · doc4.xml · derivative · entry 3

NORTHCUTT R BRUCE · CIK 0001307964 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045509 · doc4.xml · nonDerivative · entry 1

NORTHCUTT R BRUCE · CIK 0001307964 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,919

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045505 · doc4.xml · derivative · entry 3

Haas Marius · CIK 0001556683 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045505 · doc4.xml · nonDerivative · entry 1

Haas Marius · CIK 0001556683 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,495

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045507 · doc4.xml · derivative · entry 3

MCCOLLUM MARK A · CIK 0001215888 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,446 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 the Issuer's common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

F3 · derivative.expiration_date: On August 12, 2022 the reporting person was granted 1,446 restricted stock units vesting on the first anniversary of the grant date.

SEC source: 0001209191-23-045507 · doc4.xml · nonDerivative · entry 1

MCCOLLUM MARK A · CIK 0001215888 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,392

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 the Issuer's common stock on a one-for-one basis.

SEC source: 0001209191-23-045502 · doc4.xml · derivative · entry 3

Chao David Tsung-Hung · CIK 0001726418 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F3 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F3 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045503 · doc4.xml · derivative · entry 2

Graff Michael J · CIK 0001457009 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045506 · doc4.xml · derivative · entry 2

Lubel Kimberly S · CIK 0001448219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045511 · doc4.xml · derivative · entry 2

Sheets Jeffrey Wayne · CIK 0001447712 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045510 · doc4.xml · derivative · entry 2

Sabat Carolyn Chao · CIK 0001974878 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F3 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F3 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045509 · doc4.xml · derivative · entry 2

NORTHCUTT R BRUCE · CIK 0001307964 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045505 · doc4.xml · derivative · entry 2

Haas Marius · CIK 0001556683 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045507 · doc4.xml · derivative · entry 2

MCCOLLUM MARK A · CIK 0001215888 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F2 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F2 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045501 · doc4.xml · derivative · entry 2

Chao Catherine T. · CIK 0001974884 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 1,136 shares

Expires not disclosed

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

F3 · derivative.exercise_date: All of the restricted stock units will vest on August 11, 2024.

F3 · derivative.expiration_date: All of the restricted stock units will vest on August 11, 2024.

SEC source: 0001209191-23-045125 · doc4.xml · derivative · entry 7

Bender Mark Steven · CIK 0001330417 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,494

Underlying: Common Sotck · 12,606 shares

Expires 2031-02-19

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: The stock options are excercisable in three installments of 33%, 33% and 34% on February 19, 2022, 2023 and 2024, respectively.

SEC source: 0001209191-23-045125 · doc4.xml · derivative · entry 6

Bender Mark Steven · CIK 0001330417 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,033 shares

Expires 2028-02-16

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_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 16, 2019, 2020 and 2021, respectively.

SEC source: 0001209191-23-045125 · doc4.xml · nonDerivative · entry 5

Bender Mark Steven · CIK 0001330417 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,400

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $133.89 to $134.16, inclusive. The reporting person undertakes to provide to Westlake Corp., any security holder of Westlake Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-045125 · doc4.xml · nonDerivative · entry 4

Bender Mark Steven · CIK 0001330417 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,025

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $132.885 to $133.88, inclusive. The reporting person undertakes to provide to Westlake Corp., any security holder of Westlake Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001209191-23-045125 · doc4.xml · nonDerivative · entry 3

Bender Mark Steven · CIK 0001330417 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,623

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $131.88 to $132.88, inclusive. The reporting person undertakes to provide to Westlake Corp., any security holder of Westlake Corp. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.