On the Record · Westlake
Westlake subsidiaries, as it lists them
The subsidiaries Westlake lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| Eagle Spinco Inc. | Delaware |
| Rome Delaware Corp. | Delaware |
| Taiwan Chlorine Industries, Ltd. | Kaohsiung, Taiwan |
| Westlake Canada Inc. | Toronto, Canada |
| Westlake Chemical Canada Inc. | Montreal, Canada |
| Westlake Chemical OpCo LP | Delaware |
| Westlake Chemical Partners GP LLC | Delaware |
| Westlake Chemical Partners LP | Delaware |
| Westlake Chemicals & Vinyls LLC | Delaware |
| Westlake Compounds LLC | Delaware |
| Westlake DaVinci Roofscapes L.L.C. | Delaware |
| Westlake Dimex LLC | Delaware |
| Westlake Epoxy B.V. | Rotterdam, The Netherlands |
| Westlake Epoxy GmbH | Duisburg, Germany |
| Westlake Epoxy Inc. | Delaware |
| Westlake Germany GmbH & Co. KG | Ismaning, Germany |
| Westlake International I B.V. | Rotterdam, The Netherlands |
| Westlake Longview Corporation | Delaware |
| Westlake Management (Shanghai) Co. Ltd | Shanghai, China |
| Westlake Management Services, Inc. | Delaware |
| Westlake Natrium LLC | Delaware |
| Westlake Petrochemicals LLC | Delaware |
| Westlake Pipe & Fittings Corporation | Delaware |
| Westlake Polymers LLC | Delaware |
| Westlake Royal Building Products (USA) Inc. | Delaware |
| Westlake Royal Building Products Inc. | Delaware |
| Westlake Royal Roofing LLC | Delaware |
| Westlake Royal Stone LLC | Delaware |
| Westlake Royal Windows LLC | Delaware |
| Westlake Styrene LLC | Delaware |
| Westlake Switzerland GmbH | Baas, Switzerland |
| Westlake US 2 LLC | Delaware |
| Westlake Vinnolit GmbH & Co. KG | Ismaning, Germany |
| Westlake Vinnolit Holdings GmbH | Ismaning, Germany |
| Westlake Vinnolit Italia S.r.L. | Milan, Italy |
| Westlake Vinnolit Limited | Runcorn, United Kingdom |
| Westlake Vinnolit Treuhand GmbH | Ismaning, Germany |
| Westlake Vinyls Company LP | Delaware |
| Westlake Vinyls, Inc. | Delaware |
| WPT LLC | Delaware |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
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.