Westlake Chemical WLKP

Mr. Gilson has been our general partner's President and Chief Executive Officer and a director since July 2024. Mr. Gilson has also served as President and Chief Executive Officer of Westlake since July 2024 and a director since February 2026. Prior to joining Westlake, Mr. Gilson served as President, Chief Executive Officer and Representative Director of Mitsubishi Chemical Group Corporation (formerly known as Mitsubishi Chemical Holdings Corporation), from April 2021 until April 2024. From September 2014 until December 2020, Mr. Gilson served as Chief Executive Officer of Roquette Freres. Before that, Mr. Gilson served as Vice-Chairman and Chief Operating Officer of NuSil Technology LLC. Earlier in his career, Mr. Gilson held various leadership roles at Dow Corning Corporation, including as Executive Vice President, Specialty Chemicals Business, before becoming Chief Executive Officer of Avantor Performance Materials, Inc. Mr. Gilson holds a Master of Science in Chemical Engineering from the University of Liege in Belgium and a Master of Business Administration from the International Institute for Management Development in Switzerland.

Mr. Finley has been a director of our general partner since March 2020 and serves on the audit and conflicts committees. Mr. Finley was the Senior Vice President, Finance & Administration and Chief Financial Officer of Baker Hughes Incorporated from April 1999 until his retirement in April 2006. Prior to that, from February 1982 to April 1999, Mr. Finley held various financial and administrative management positions with Baker Hughes. From June 2007 to May 2022, Mr. Finley served on the Board of Directors of Newpark Resources, Inc. and, from November 2006 to April 2018, he served on the Board of Directors of Archrock GP, LLC (previously known as Exterran GP, LLC), the general partner of Archrock Partners, L.P. He also served on the Board of Directors of Columbia Pipeline Partners LP from March 2015 to February 2017, Microseismic, Inc. from April 2012 to December 2014, Total Safety U.S., Inc. from December 2006 until November 2011, and Ocean Rig ASA from June 2006 to June 2008. Mr. Finley received a Bachelor of Science degree in Accounting from Indiana State University.

Ms. Friel has been a director of our general partner since April 2023 and serves on the audit and conflicts committees. Ms. Friel was the Managing Partner of Ernst & Young LLP's San Antonio, Texas office from July 2012 until her retirement in September 2020. Ms. Friel began her career with Ernst & Young LLP in 1988. Ms. Friel holds a bachelor's of science degree in Accounting and Business Administration from the University of Kansas and is a Certified Public Accountant.

Mr. Woelfel has been a director of our general partner since November 2019 and serves on the audit and conflicts committees. Mr. Woelfel served as a director of Black & Veatch Holding Company from March 2013 to December 2025 and was Chief Executive Officer and a director of NOVA Chemicals Corporation from November 2009 until May 2014. Prior to joining NOVA, Mr. Woelfel was Managing Director of Energy for the Houston Technology Center and President of Cereplast, Inc. He began his career with Shell Oil Company in 1977. While at Shell Oil and affiliated companies, he served in a variety of senior positions, including President of Basell International, President of Basell North America and as a board member of numerous Basell International petrochemical ventures. Since 2014, Mr. Woelfel has provided services as a business consultant through Woelfel Associates Inc., a company that provides strategic advice to boards of directors and businesses. Mr. Woelfel received a Bachelor of Science degree in Chemical Engineering from Rice University and a Master's degree in Management from the Massachusetts Institute of Technology.

On August 31, 2026, Westlake Chemical Partners LP (the Partnership) announced that Tommy E. Darby, age 45, was appointed to the position of Vice President, Chief Accounting Officer of Westlake Chemical Partners GP LLC, the general partner of the Partnership (the General Partner), effective immediately. In connection with his appointment as Vice President, Chief Accounting Officer of the General Partner, Mr. Darby was also appointed as Vice President, Chief Accounting Officer of Westlake Corporation, the indirect parent company of the General Partner, effective August 31, 2026. Prior to joining the General Partner, from August 2022 to April 2025, Mr. Darby served as Vice President and Chief Accounting Officer of Pactiv Evergreen Inc. (now Novolex) and, earlier in his tenure there, as Vice President and Controller. From March 2008 to May 2020, Mr. Darby held various leadership roles at Valaris plc (now Valaris Limited) and its predecessor companies in external reporting, financial systems and internal audit, before serving as Vice President and Controller and later as Vice President, Finance. Earlier in his career, Mr. Darby worked in audit and assurance at Deloitte LLP. Mr. Darby received a Bachelor of Science degree in Accounting and a Master of Science degree in Auditing and Financial Accounting from the University of North Texas and is a Certified Public Accountant.

Mr. Holy was our general partner's Vice President and Chief Accounting Officer from April 2024 to August 2026. From April 2017 to April 2024, Mr. Holy served as our general partner's Vice President and Treasurer. Mr. Holy has also been Westlake's Vice President and Chief Accounting Officer since April 2024, and, from April 2017 to April 2024, Mr. Holy served as its Vice President and Treasurer. Prior to joining Westlake, from October 2014 to March 2017, Mr. Holy was Assistant Treasurer at FMC Technologies, Inc. and, from October 2013 to September 2014, Director of Corporate Finance. From September 2007 to September 2013, he held various financial positions at General Motors Company in their Treasurers' Office in New York and Germany. He began his career in public accounting with Ernst & Young LLP in 2001. Mr. Holy holds a Bachelor of Science Degree from Trinity University in Business Administration and Economics, a Master in Accounting Degree from the University of Virginia, and a Master in Finance Degree from London Business School. He is a Chartered Financial Analyst and Certified Public Accountant. Effective 31st August 2026, Jeffrey Holy was appointed as Vice President, Finance and Investor Relations.

On April 20, 2026, Westlake Chemical Partners LP announced that Jonathan H. Baksht was appointed as Senior Vice President and Chief Financial Officer and as a director of Westlake Chemical Partners GP LLC, the general partner of the Partnership, effective June 15, 2026. In connection with his appointment as Senior Vice President and Chief Financial Officer and director of the General Partner, Mr. Baksht was also appointed as Senior Vice President and Chief Financial Officer of Westlake Corporation, the indirect parent company of the General Partner, effective June 15, 2026. Prior to joining the General Partner, Mr. Baksht served as Executive Vice President and Chief Financial Officer of Fortune Brands Innovations, Inc. from May 2025 to March 2026. From May 2022 to May 2025, Mr. Baksht served as Chief Financial Officer of Pactiv Evergreen Inc. and from August 2013 to September 2021, Mr. Baksht held various positions at Valaris Limited, including most recently as Chief Financial Officer from November 2015 until September 2021. Earlier in his career, he worked in investment banking at Goldman, Sachs & Co. and in management consulting at Andersen Consulting. He has served on the Board of Directors of Duxion Motors Inc. since January 2022 and previously served on the Board of Directors of ARO Drilling, a joint venture between Valaris and Saudi Aramco, from April 2019 to September 2021. Mr. Baksht received a bachelor's of science degree in electrical engineering from the University of Texas at Austin and an M.B.A from the Kellogg Graduate School of Management at Northwestern University.

Mr. Chao has been Senior Chairman of the Board of Directors of our general partner since July 2024, a director since our general partner's formation in March 2014 and served as Chairman of the Board from July 2014 to July 2024. Additionally, Mr. Chao has been Westlake's Senior Chairman of the Board of Directors since July 2024 and became a director in June 2003. From July 2004 to July 2024, Mr. Chao served as Westlake's Chairman of the Board and, from May 1996 to July 2004, he served as Westlake's Vice Chairman. From June 2003 until November 2010, Mr. Chao was the executive chairman of Titan Chemicals Corp. Bhd. He has served as a Special Assistant to the Chairman of China General Plastics Group and worked in various financial, managerial and technical positions at Mattel Incorporated, Developmental Bank of Singapore, Singapore Gulf Plastics Pte. Ltd. and Gulf Oil Corporation. Mr. Chao, along with his brother, Albert Chao, assisted their father, T.T. Chao, in founding Westlake. Mr. Chao received his B.S. degree from the Massachusetts Institute of Technology and an M.B.A. from Columbia University.

Mr. Chao has been Executive Chairman of the Board of Directors of our general partner since July 2024, a director since our general partner's formation in March 2014 and served as President and Chief Executive Officer from March 2014 to July 2024. Additionally, Mr. Chao has been Westlake's Executive Chairman of the Board of Directors since July 2024 and a director since June 2003. From May 1996 to July 2024, Mr. Chao served as Westlake's President and, from July 2004 to July 2024, he served as Westlake's Chief Executive Officer. In 1985, Mr. Chao assisted his father, T.T. Chao, and his brother, James Chao, in founding Westlake. He has held positions in the Controller's Group of Mobil Oil Corporation, in the Technical Department of Hercules Incorporated, in the Plastics Group of Gulf Oil Corporation and has served as Assistant to the Chairman of China General Plastics Group and Deputy Managing Director of a plastics fabrication business in Singapore. Mr. Chao received a bachelor's degree from Brandeis University and an M.B.A. from Columbia University.

Ms. Moore has been our general partner's Vice President, Olefins and Polyethylene since August 2025. In addition, Ms. Moore has been Westlake's Vice President, Olefins and Polyethylene since April 2025. From March 2022 to April 2025, Ms. Moore served as Westlake's Vice President, Polyethylene; from November 2019 to March 2022 she was its Business Director, Polyethylene; from August 2018 to October 2019 she was its Business Manager, Polyethylene; and from August 2010 to July 2018 she was its Commercial Manager, Olefins Products. Prior to joining Westlake, Ms. Moore held a number of positions in manufacturing, sales and business planning at Chevron Phillips Chemical Company in their Olefins and Polyethylene division. Ms. Moore holds a B.S. in Chemical Engineering and a Masters of Business Administration from Lamar University.

Mr. Ederington has been our general partner's Executive Vice President, Performance and Essential Materials, General Counsel and Chief Administrative Officer since May 2023 and a director since our general partner's formation in March 2014. Mr. Ederington served as our general partner's Executive Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary from March 2022 to May 2023, Senior Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary from February 2021 to March 2022 and as Vice President, General Counsel and Secretary from March 2014 to February 2021. Mr. Ederington has also been Westlake's Executive Vice President, Performance and Essential Materials, General Counsel and Chief Administrative Officer since April 2023. From March 2022 to April 2023, Mr. Ederington served as Westlake's Executive Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary; from July 2017 to March 2022, he was its Senior Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary; from December 2015 to July 2017, he was its Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary; and, from October 2013 to December 2015, he was its Vice President, General Counsel and Corporate Secretary. Prior to joining Westlake, he held a variety of senior legal positions at LyondellBasell Industries, N.V. and its predecessor companies, LyondellBasell Industries AF SCA and Lyondell Chemical Company, including most recently as Associate General Counsel, Commercial & Strategic Transactions. He began his legal career more than 25 years ago at the law firm of Steptoe & Johnson, LLP. Mr. Ederington holds a B.A. from Yale University and received his J.D. from Harvard University.