Westlake competitors, on the record

Who Westlake names

In its own words

1. Aditya Birla Chemicals (Thailand) Ltd., Allnex Management GmbH, Chang Chun Plastics Co., Ltd., Evonik Industries AG, Huntsman Corporation, Kukdo Chemical Co., Ltd., Kumhu Asiana Group, LEUNA-Harze GmbH, Nan Ya Plastics Corporation, Ningbo Bohui Chemical Technology Co., Ltd., Shanghai Kangda Chemical New Material Group Co., Ltd., Swancor Holding Company Limited, Techstorm Advanced Material Co., Ltd., the Spolchemie Group

   Word for word“Our competitors in the epoxy value chain include Olin Corporation, Nan Ya Plastics Corporation, the Spolchemie Group, LEUNA-Harze GmbH, Aditya Birla Chemicals (Thailand) Ltd., Huntsman Corporation, Swancor Holding Company Limited, Ningbo Bohui Chemical Technology Co., Ltd., Techstorm Advanced Material Co., Ltd., Shanghai Kangda Chemical New Material Group Co., Ltd., Evonik Industries AG, Allnex Management GmbH, Kukdo Chemical Co., Ltd., Kumhu Asiana Group and Chang Chun Plastics Co., Ltd.” 10-K for 2025

2. Chevron Phillips Chemical Company, Dow Inc., ExxonMobil Chemical Company, Formosa Plastics Corporation, LyondellBasell Industries, N.V., NOVA Chemicals Corporation, Sasol Limited

   Word for word“Our competitors in the ethylene and PE markets are some of the world's largest chemical companies, including Chevron Phillips Chemical Company, Dow Inc., ExxonMobil Chemical Company, Formosa Plastics Corporation, LyondellBasell Industries, N.V., NOVA Chemicals Corporation and Sasol Limited.” 10-K for 2025

3. INOVYN ChlorVinyls Limited, KEM ONE Group SAS, Occidental Chemical Corporation, Olin Corporation, Orbia Advance Corporation, Shintech, Inc., VYNOVA Group

   Word for word“We compete in the chlor-alkali and PVC markets with other producers including Formosa Plastics Corporation, INOVYN ChlorVinyls Limited, KEM ONE Group SAS, Olin Corporation, Orbia Advance Corporation, Occidental Chemical Corporation, Shintech, Inc. and VYNOVA Group.” 10-K for 2025

Who names Westlake

Companies whose own annual reports name Westlake as a competitor.

1. Azek names it as “Westlake Corp.” · 2024

   Word for word“In addition to wood, we compete with other manufacturers of wood-alternative products, including Trex Company Inc., Fiberon, a subsidiary of Fortune Brands Innovations, Inc., Deckorators, a subsidiary of UFP Industries, Inc., Oldcastle APG, Inc., Westlake Corp., including Westlake Royal Building Products and Kleer Lumber, Louisiana-Pacific Corporation, Cornerstone Brands Inc., and CertainTeed, a subsidiary of Saint-Gobain Group.” 10-K for 2024

2. Huntsman · 2025

   Word for word“Our major competitors include Kaneka, Taiyo and Westlake.” 10-K for 2025

3. Olin · 2025

   Word for word“Among our competitors are Huntsman Corporation, Westlake, Kukdo Chemical Co. Ltd. and Kumho P&B Chemicals, as well as multiple other producers located in Asia.” 10-K for 2025

4. Openlane · 2025

   Word for word“At the national level, AFC's competition includes NextGear Capital, Westlake, Kinetic and other specialty lenders, banks and financial institutions.” 10-K for 2025

Read from Westlake’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-26. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.