person · Reporting owner

Chao Albert

Disclosed activity across 2 companies

Tapewire entity: 24564
SEC CIK: 0001299403

Reported relationships

Latest disclosed role at each company.

Company	Last reported as	Report date	Published
WESTLAKE CORPWLK · Entity 3555	Director · Executive Chairman	August 11, 2026	August 11, 2026
Westlake Chemical Partners LPWLKP · Entity 5149	Director · President & CEO · 10% owner	March 24, 2020	March 25, 2020

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

WESTLAKE CORP

Report date August 11, 2026 · Filed August 11, 2026

Security / award	Ownership account	Disclosed shares / units	Disclosure context
Common StockSEC Table I · non-derivative	Direct	642,880	Ending reported balance After 2026-08-11 transaction · row 3 3 source rows · reconciled sequence Row 1 · 2026-08-11 · Exercise / conversion · Acquired 38,873 · Balance 681,753 Row 2 · 2026-08-11 · Sale · Disposed 7,489 · Balance 674,264 F1: Weighted average price. These shares were sold in multiple transactions ranging from $79.02 to $80.01 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Row 3 · 2026-08-11 · Sale · Disposed 31,384 · Balance 642,880 F2: Weighted average price. These shares were sold in multiple transactions ranging from $80.10 to $80.86 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
Employee Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $61.87 · Expires 2027-02-17	Direct	38,873	Reported balance After 2026-08-11 transaction · row 4 Instrument identity requires review; Table II rows are not merged. 1 source row Row 4 · 2026-08-11 · Exercise / conversion · Disposed 38,873 · Balance 38,873 F3: The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively.

Filing footnotes · ownership attribution and instrument terms

F1: Weighted average price. These shares were sold in multiple transactions ranging from $79.02 to $80.01 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

F2: Weighted average price. These shares were sold in multiple transactions ranging from $80.10 to $80.86 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

F3: The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively.

Westlake Chemical Partners LP

Report date March 24, 2020 · Filed March 25, 2020

Security / award	Ownership account	Disclosed shares / units	Disclosure context
Common Units (Limited Partner Interests)SEC Table I · non-derivative	Direct	166,435	Ending reported balance After 2020-03-24 transaction · row 2 2 source rows · reconciled sequence Row 1 · 2020-03-24 · Purchase · Acquired 3,200 · Balance 164,856 F1: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions ranging from $12.81 to $13.75, inclusive. The reporting person undertakes to provide to Westlake Chemical Partners LP, any security holder of Westlake Chemical Partners LP or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote. Row 2 · 2020-03-24 · Purchase · Acquired 1,579 · Balance 166,435 F2: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions ranging from $13.85 to $14.45, inclusive. The reporting person undertakes to provide to Westlake Chemical Partners LP, any security holder of Westlake Chemical Partners LP or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote.
Common Units (Limited Partner Interests)SEC Table I · non-derivative	Indirectby Trusts	27,275	Reported balance Holding disclosure · report date 2020-03-24 · row 3 Holding and transaction disclosures are not merged. 1 source row Row 3 · Balance 27,275
Common Units (Limited Partner Interests)SEC Table I · non-derivative	IndirectTTWF LP & TTWFGP LLC	14,122,230	Reported balance Holding disclosure · report date 2020-03-24 · row 4 Holding and transaction disclosures are not merged. 1 source row Row 4 · Balance 14,122,230 F3: WPT LLC ("WPT") owns 14,122,230 common units ("Common Units") representing limited partner interests in the Issuer. Westlake Chemical Corporation ("Westlake") owns 100% of each of Westlake Olefins LLC ("Olefins"), Westlake Vinyl Corporation ("Vinyl") and Westlake Longview Corporation ("Longview"). Olefins owns 100% of Westlake Chemical Investments, lnc., which owns 84.25% of Westlake Polymers LLC ("Polymers"). Vinyl owns 100% of Westlake Vinyls, Inc., which owns 12.95% Polymers. Longview owns 2.80% of Polymers. Polymers owns 100% of WPT LLC. The reporting person may be deemed to indirectly own the Common Units through his ownership interest in TTWF LP, a Delaware limited partnership through which the reporting person indirectly holds 92,970,554 shares of Westlake. F4: Two trusts for the benefit of members of the Chao family, including the reporting person, are the managers of TTWF GP LLC, a Delaware limited liability company that is the general partner of TTWF LP. The limited partners of TTWF LP are five trusts, principally for the benefit of members of the Chao family, including the reporting person, and two corporations owned, indirectly or directly, by certain of these trusts and by other entities owned by members of the Chao family, including the reporting person. The reporting person shares investment and voting power with respect to the common units beneficially owned by TTWF LP. The reporting person disclaims beneficial ownership of the Common Units except to the extent of his pecuniary interest therein.

Filing footnotes · ownership attribution and instrument terms

F1: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions ranging from $12.81 to $13.75, inclusive. The reporting person undertakes to provide to Westlake Chemical Partners LP, any security holder of Westlake Chemical Partners LP or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote.

F2: The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions ranging from $13.85 to $14.45, inclusive. The reporting person undertakes to provide to Westlake Chemical Partners LP, any security holder of Westlake Chemical Partners LP or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote.

F3: WPT LLC ("WPT") owns 14,122,230 common units ("Common Units") representing limited partner interests in the Issuer. Westlake Chemical Corporation ("Westlake") owns 100% of each of Westlake Olefins LLC ("Olefins"), Westlake Vinyl Corporation ("Vinyl") and Westlake Longview Corporation ("Longview"). Olefins owns 100% of Westlake Chemical Investments, lnc., which owns 84.25% of Westlake Polymers LLC ("Polymers"). Vinyl owns 100% of Westlake Vinyls, Inc., which owns 12.95% Polymers. Longview owns 2.80% of Polymers. Polymers owns 100% of WPT LLC. The reporting person may be deemed to indirectly own the Common Units through his ownership interest in TTWF LP, a Delaware limited partnership through which the reporting person indirectly holds 92,970,554 shares of Westlake.

F4: Two trusts for the benefit of members of the Chao family, including the reporting person, are the managers of TTWF GP LLC, a Delaware limited liability company that is the general partner of TTWF LP. The limited partners of TTWF LP are five trusts, principally for the benefit of members of the Chao family, including the reporting person, and two corporations owned, indirectly or directly, by certain of these trusts and by other entities owned by members of the Chao family, including the reporting person. The reporting person shares investment and voting power with respect to the common units beneficially owned by TTWF LP. The reporting person disclaims beneficial ownership of the Common Units except to the extent of his pecuniary interest therein.

Transaction history

JSON API

Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction date	Company	Activity / security	Shares / units	Reported price	Reported value	Details
August 11, 2026 Filed Aug 11, 2026 21:45 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionEmployee Option (right to buy) · Derivative	38,873	$0.00 Strike: $61.87	$0.00	Disclosure SEC source: 0001193125-26-345140 · ownership.xml · derivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 38,873 Underlying: Common Stock · 38,873 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. F3 · derivative.exercise_date: The stock options are exercisable in three installments of 33%, 33% and 34% on February 17, 2018, 2019 and 2020, respectively. Read SEC document
August 11, 2026 Filed Aug 11, 2026 21:45 UTC	WESTLAKE CORP WLK · Entity 3555	SaleCommon Stock	31,384	$80.42	$2,523,901.28	Disclosure SEC source: 0001193125-26-345140 · ownership.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 642,880 F2 · price: Weighted average price. These shares were sold in multiple transactions ranging from $80.10 to $80.86 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
August 11, 2026 Filed Aug 11, 2026 21:45 UTC	WESTLAKE CORP WLK · Entity 3555	SaleCommon Stock	7,489	$79.70	$596,873.30	Disclosure SEC source: 0001193125-26-345140 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 674,264 F1 · price: Weighted average price. These shares were sold in multiple transactions ranging from $79.02 to $80.01 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
August 11, 2026 Filed Aug 11, 2026 21:45 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	38,873	$61.87	$2,404,878.15	Disclosure SEC source: 0001193125-26-345140 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 681,753 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. Read SEC document
February 20, 2026 Filed Feb 23, 2026 19:40 UTC	WESTLAKE CORP WLK · Entity 3555	GrantRestricted Stock Units · Derivative	14,945	$0.00	$0.00	Disclosure SEC source: 0001193125-26-063663 · ownership.xml · derivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 14,945 Underlying: Common Stock · 14,945 shares Expires not disclosed F5 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock. F6 · derivative.exercise_date: All of the RSUs will vest on February 20, 2029. F6 · derivative.expiration_date: All of the RSUs will vest on February 20, 2029. Read SEC document
February 20, 2026 Filed Feb 23, 2026 19:40 UTC	WESTLAKE CORP WLK · Entity 3555	GrantEmployee Option (right to buy) · Derivative	54,763	$0.00 Strike: $94.48	$0.00	Disclosure SEC source: 0001193125-26-063663 · ownership.xml · derivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 54,763 Underlying: Common Stock · 54,763 shares Expires 2036-02-20 F4 · derivative.exercise_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 20, 2027, 2028 and 2029, respectively. Read SEC document
February 20, 2026 Filed Feb 23, 2026 19:40 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	2,501	$94.10	$235,346.60	Disclosure SEC source: 0001193125-26-063663 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 642,880 F2 · shares: Shares otherwise issuable were witheld to satisfy tax obligations arising out of vesting of the Reporting Person's PSUs. F3 · price: Weighted average price. These shares were sold in multiple transactions at prices ranging from $94.10 to $94.38, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
February 19, 2026 Filed Feb 23, 2026 19:40 UTC	WESTLAKE CORP WLK · Entity 3555	GrantCommon Stock	6,193	$0.00	$0.00	Disclosure SEC source: 0001193125-26-063663 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 645,381 F1 · shares: Represents shares of common stock that vested on February 19, 2026, upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units ("PSUs") granted to the Reporting Person on February 17, 2023, under the terms of the Issuer's 2013 Omnibus Incentive Plan. Read SEC document
February 18, 2026 Filed Feb 19, 2026 20:19 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	5,089	$98.95	$503,556.55	Disclosure SEC source: 0001193125-26-059211 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 639,188 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs. Read SEC document
February 17, 2026 Filed Feb 19, 2026 20:19 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionRestricted Stock Units · Derivative	16,555	$0.00	$0.00	Disclosure SEC source: 0001193125-26-059211 · ownership.xml · derivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 16,555 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 ("RSUs") convert into the Issuer's common stock on a one-for-one basis. F2 · derivative.exercise_date: On February 17, 2023, the reporting person was granted 16,555 RSUs vesting on the third anniversay of the grant date. F2 · derivative.expiration_date: On February 17, 2023, the reporting person was granted 16,555 RSUs vesting on the third anniversay of the grant date. Read SEC document
February 17, 2026 Filed Feb 19, 2026 20:19 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	16,555	$0.00	$0.00	Disclosure SEC source: 0001193125-26-059211 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 644,277 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 ("RSUs") convert into the Issuer's common stock on a one-for-one basis. Read SEC document
December 22, 2025 Filed Dec 23, 2025 14:37 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionEmployee Option (right to buy) · Derivative	81,673	$0.00 Strike: $44.42	$0.00	Disclosure SEC source: 0001193125-25-329926 · ownership.xml · derivative · entry 5 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 81,673 shares Expires 2026-02-18 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. F5 · derivative.exercise_date: The stock options are exercisable in three installments of 33%, 33% and 34% on February 18, 2017, 2018 and 2019, respectively. Read SEC document
December 22, 2025 Filed Dec 23, 2025 14:37 UTC	WESTLAKE CORP WLK · Entity 3555	SaleCommon Stock	521	$74.44	$38,784.80	Disclosure SEC source: 0001193125-25-329926 · ownership.xml · nonDerivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 627,722 F1 · kind: A portion of the sale proceeds were used to cover the strike price and related taxes in regards to the excercise of the options disclosed in Table II. F4 · price: Weighted average price. These shares were sold in multiple transactions ranging from $74.405 to $74.515 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
December 22, 2025 Filed Dec 23, 2025 14:37 UTC	WESTLAKE CORP WLK · Entity 3555	SaleCommon Stock	30,604	$73.80	$2,258,452.78	Disclosure SEC source: 0001193125-25-329926 · ownership.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 628,243 F1 · kind: A portion of the sale proceeds were used to cover the strike price and related taxes in regards to the excercise of the options disclosed in Table II. F3 · price: Weighted average price. These shares were sold in multiple transactions ranging from $73.40 to $74.40 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
December 22, 2025 Filed Dec 23, 2025 14:37 UTC	WESTLAKE CORP WLK · Entity 3555	SaleCommon Stock	9,711	$72.82	$707,135.60	Disclosure SEC source: 0001193125-25-329926 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 658,847 F1 · kind: A portion of the sale proceeds were used to cover the strike price and related taxes in regards to the excercise of the options disclosed in Table II. F2 · price: Weighted average price. These shares were sold in multiple transactions ranging from $72.395 to $73.39 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
December 22, 2025 Filed Dec 23, 2025 14:37 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	81,673	$44.42	$3,627,914.66	Disclosure SEC source: 0001193125-25-329926 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 668,558 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. Read SEC document
February 21, 2025 Filed Feb 24, 2025 19:10 UTC	WESTLAKE CORP WLK · Entity 3555	GrantRestricted Stock Units · Derivative	12,322	$0.00	$0.00	Disclosure SEC source: 0000950170-25-025478 · ownership.xml · derivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 12,322 Underlying: Common Stock · 12,322 shares Expires not disclosed F5 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to recieve one share of the Issuer's common stock. F6 · derivative.exercise_date: All of the RSUs will vest on February 21, 2028. F6 · derivative.expiration_date: All of the RSUs will vest on February 21, 2028. Read SEC document
February 21, 2025 Filed Feb 24, 2025 19:10 UTC	WESTLAKE CORP WLK · Entity 3555	GrantEmployee Option (right to buy) · Derivative	37,172	$0.00 Strike: $110.15	$0.00	Disclosure SEC source: 0000950170-25-025478 · ownership.xml · derivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 37,172 Underlying: Common Stock · 37,172 shares Expires 2035-02-21 F4 · derivative.exercise_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 21, 2026, 2027 and 2028, respectively. Read SEC document
February 21, 2025 Filed Feb 24, 2025 19:10 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	13,390	$110.54	$1,480,130.60	Disclosure SEC source: 0000950170-25-025478 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 586,885 F2 · shares: Shares otherwise issuable were witheld to satisfy tax obligations arising out of vesting of the Reporting Person's PSUs. F3 · price: Weighted average price. These shares were sold in multiple transactions at prices ranging from $110.54 to $110.73, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
February 20, 2025 Filed Feb 24, 2025 19:10 UTC	WESTLAKE CORP WLK · Entity 3555	GrantCommon Stock	33,456	$0.00	$0.00	Disclosure SEC source: 0000950170-25-025478 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 600,275 F1 · shares: Represents shares of common stock that vested on February 20, 2025, upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units ("PSUs") granted to the Reporting Person on February 18, 2022, under the terms of the Issuer's 2013 Omnibus Incentive Plan. Read SEC document
February 19, 2025 Filed Feb 20, 2025 19:30 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	249	$112.73	$28,069.77	Disclosure SEC source: 0000950170-25-024009 · ownership.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 566,819 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs. Read SEC document
February 19, 2025 Filed Feb 20, 2025 19:30 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	5,820	$111.46	$648,697.20	Disclosure SEC source: 0000950170-25-024009 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 567,068 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs. Read SEC document
February 18, 2025 Filed Feb 20, 2025 19:30 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionRestricted Stock Units · Derivative	17,972	$0.00	$0.00	Disclosure SEC source: 0000950170-25-024009 · ownership.xml · derivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 17,972 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 ("RSUs") convert into the Issuer's common stock on a one-for-one basis. F2 · derivative.exercise_date: On February 18, 2022, the reporting person was granted 17,972 RSUs vesting on the third anniversay of the grant date. F2 · derivative.expiration_date: On February 18, 2022, the reporting person was granted 17,972 RSUs vesting on the third anniversay of the grant date. Read SEC document
February 18, 2025 Filed Feb 20, 2025 19:30 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	17,972	$0.00	$0.00	Disclosure SEC source: 0000950170-25-024009 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 572,888 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 ("RSUs") convert into the Issuer's common stock on a one-for-one basis. Read SEC document
August 16, 2024 Filed Aug 19, 2024 18:50 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionEmployee Option (right to buy) · Derivative	45,298	$0.00 Strike: $68.09	$0.00	Disclosure SEC source: 0000950170-24-098422 · ownership.xml · derivative · entry 4 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 45,298 shares Expires 2025-08-20 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 exercisable in three installments of 33%, 33% and 34% on February 20, 2016, 2017 and 2018, respectively. Read SEC document
August 16, 2024 Filed Aug 19, 2024 18:50 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	7	$147.04	$1,029.28	Disclosure SEC source: 0000950170-24-098422 · ownership.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 554,916 Read SEC document
August 16, 2024 Filed Aug 19, 2024 18:50 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	45,291	$146.61	$6,640,249.38	Disclosure SEC source: 0000950170-24-098422 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 554,923 F1 · price: Weighted average price. These shares were sold in multiple transactions ranging from $146.024 to $146.96 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Read SEC document
August 16, 2024 Filed Aug 19, 2024 18:50 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	45,298	$68.09	$3,084,340.82	Disclosure SEC source: 0000950170-24-098422 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · Executive Chairman 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 600,214 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. Read SEC document
February 20, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	2,207	$137.37	$303,173.38	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · nonDerivative · entry 5 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 554,916 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs and PSUs. F4 · price: Weighted average price. These shares were sold in multiple transactions ranging from $137.33 to $137.44, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth above. Read SEC document
February 20, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	12	$135.43	$1,625.16	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · nonDerivative · entry 4 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 557,123 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs and PSUs. Read SEC document
February 20, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	22,561	$129.92	$2,931,125.12	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 557,135 F3 · shares: Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs and PSUs. Read SEC document
February 19, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionRestricted Stock Units · Derivative	19,810	$0.00	$0.00	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · derivative · entry 6 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 19,810 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis. F5 · derivative.exercise_date: On February 19, 2021, the reporting person was granted 19,810 RSUs vesting on the third anniversay of the grant date. F5 · derivative.expiration_date: On February 19, 2021, the reporting person was granted 19,810 RSUs vesting on the third anniversay of the grant date. Read SEC document
February 19, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	19,810	$0.00	$0.00	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 579,696 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. F2 · price: Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis. Read SEC document
February 16, 2024 Filed Feb 20, 2024 14:05 UTC	WESTLAKE CORP WLK · Entity 3555	GrantRestricted Stock Units · Derivative	16,010	$0.00	$0.00	Disclosure SEC source: 0000950170-24-016825 · ownership.xml · derivative · entry 2 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 16,010 Underlying: Common Stock · 16,010 shares Expires not disclosed F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock F3 · derivative.exercise_date: All of the restricted stock units will vest on February 16, 2027. F3 · derivative.expiration_date: All of the restricted stock units will vest on February 16, 2027. Read SEC document
February 16, 2024 Filed Feb 20, 2024 14:05 UTC	WESTLAKE CORP WLK · Entity 3555	GrantEmployee Option (right to buy) · Derivative	44,324	$0.00 Strike: $144.49	$0.00	Disclosure SEC source: 0000950170-24-016825 · ownership.xml · derivative · entry 1 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 44,324 Underlying: Common Stock · 44,324 shares Expires 2034-02-16 F1 · derivative.exercise_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 16, 2025, 2026 and 2027, respectively. Read SEC document
February 16, 2024 Filed Feb 21, 2024 15:28 UTC	WESTLAKE CORP WLK · Entity 3555	GrantCommon Stock	39,738	$0.00	$0.00	Disclosure SEC source: 0000950170-24-017622 · ownership.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 559,886 F1 · shares: Represents shares of common stock that vested on February 16, 2024 upon the approval of the Issuer's Board of Directors ("BOD"), and the determination by the Compensation Committee of the BOD, of the satisfaction of performance criteria underlying an award of performance stock units ("PSUs") granted to the Reporting Person on February 19, 2021 under the terms of the Issuer's 2013 Omnibus Incentive Plan. Read SEC document
August 31, 2023 Filed Sep 1, 2023 14:11 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionEmployee Option (right to buy) · Derivative	19,988	$0.00 Strike: $63.98	$0.00	Disclosure SEC source: 0001209191-23-047915 · doc4.xml · derivative · entry 6 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 19,988 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. F5 · derivative.exercise_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 14, 2015, 2016 and 2017, respectively. Read SEC document
August 31, 2023 Filed Sep 1, 2023 14:11 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	317	$132.67	$42,055.12	Disclosure SEC source: 0001209191-23-047915 · doc4.xml · nonDerivative · entry 4 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 520,148 F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $132.625 to $132.80, 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. Read SEC document
August 31, 2023 Filed Sep 1, 2023 14:11 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	8,397	$131.94	$1,107,874.99	Disclosure SEC source: 0001209191-23-047915 · 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: 520,465 F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $131.62 to $132.57, 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. Read SEC document
August 31, 2023 Filed Sep 1, 2023 14:11 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	11,274	$131.20	$1,479,103.70	Disclosure SEC source: 0001209191-23-047915 · 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: 528,862 F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $130.61 to $131.61, 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. Read SEC document
August 31, 2023 Filed Sep 1, 2023 14:11 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	19,988	$63.98	$1,278,782.27	Disclosure SEC source: 0001209191-23-047915 · 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: 540,136 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. Read SEC document
August 30, 2023 Filed Aug 31, 2023 15:36 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionEmployee Option (right to buy) · Derivative	20,000	$0.00 Strike: $63.98	$0.00	Disclosure 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. Read SEC document
August 30, 2023 Filed Aug 31, 2023 15:36 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	2,315	$134.60	$311,603.63	Disclosure 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. Read SEC document
August 30, 2023 Filed Aug 31, 2023 15:36 UTC	WESTLAKE CORP WLK · Entity 3555	Disposition to issuerCommon Stock	17,685	$134.09	$2,371,363.97	Disclosure 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. Read SEC document
August 30, 2023 Filed Aug 31, 2023 15:36 UTC	WESTLAKE CORP WLK · Entity 3555	Exercise / conversionCommon Stock	20,000	$63.98	$1,279,550.00	Disclosure 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. Read SEC document
March 13, 2023 Filed Mar 15, 2023 19:18 UTC Amendment	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	1,109	$104.70	$116,112.30	Disclosure SEC source: 0001567619-23-005096 · doc1.xml · nonDerivative · entry 3 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 520,148 F1 · shares: The original Form 4 filed by the Reporting Person on February 17, 2023 is amended by this Form 4 Amendment to disclose that 21,976 shares of common stock were sold to cover tax withholding obligations arising from the award reported in the original Form 4. The original Form 4 did not report the sale to cover tax withholding obligations because the number of shares to be sold was not known at the time of filing. This Form 4 Amendment is in addition to, and does not replace, the disclosure contained in the original Form 4. Read SEC document
March 13, 2023 Filed Mar 15, 2023 19:18 UTC Amendment	WESTLAKE CORP WLK · Entity 3555	Tax withholdingCommon Stock	20,867	$104.32	$2,176,845.44	Disclosure SEC source: 0001567619-23-005096 · doc1.xml · nonDerivative · entry 2 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 521,257 F1 · shares: The original Form 4 filed by the Reporting Person on February 17, 2023 is amended by this Form 4 Amendment to disclose that 21,976 shares of common stock were sold to cover tax withholding obligations arising from the award reported in the original Form 4. The original Form 4 did not report the sale to cover tax withholding obligations because the number of shares to be sold was not known at the time of filing. This Form 4 Amendment is in addition to, and does not replace, the disclosure contained in the original Form 4. Read SEC document
February 17, 2023 Filed Feb 17, 2023 20:36 UTC	WESTLAKE CORP WLK · Entity 3555	GrantCommon Stock	52,252	$0.00	$0.00	Disclosure SEC source: 0001567619-23-003264 · doc1.xml · nonDerivative · entry 1 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 542,124 F1 · shares: Represents shares of common stock that vested upon the determination by the Compensation Committee of the Issuer's Board of Directors of the satisfaction of performance criteria underlying an award of performance stock units granted to the Reporting Person on February 14, 2020 under the terms of the Issuer's 2013 Omnibus Incentive Plan. Read SEC document
February 17, 2023 Filed Feb 21, 2023 14:07 UTC	WESTLAKE CORP WLK · Entity 3555	GrantRestricted Stock Units · Derivative	16,555	$0.00	$0.00	Disclosure SEC source: 0001567619-23-003369 · doc1.xml · derivative · entry 2 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 16,555 Underlying: Common Stock · 16,555 shares Expires not disclosed F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. F3 · derivative.exercise_date: All of the restricted stock units will vest on February 17, 2026. F3 · derivative.expiration_date: All of the restricted stock units will vest on February 17, 2026. Read SEC document
February 17, 2023 Filed Feb 21, 2023 14:07 UTC	WESTLAKE CORP WLK · Entity 3555	GrantEmployee Option (right to buy) · Derivative	45,196	$0.00 Strike: $122.65	$0.00	Disclosure SEC source: 0001567619-23-003369 · doc1.xml · derivative · entry 1 Chao Albert · CIK 0001299403 · Director · President & CEO · 10% owner 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 45,196 Underlying: Common Stock · 45,196 shares Expires 2033-02-17 F1 · derivative.exercise_date: The stock options are excercisable in three installments of 33%, 33% and 34% on February 17, 2024, 2025 and 2026, respectively. Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.