| Name of Subsidiary | State or Other Jurisdiction of Incorporation or Organization | Names Doing Business | ||||||||||||
| Eagle Spinco Inc. | Delaware | Eagle Spinco Inc. | ||||||||||||
| Rome Delaware Corp. | Delaware | Rome Delaware Corp. | ||||||||||||
Taiwan Chlorine Industries, Ltd. | Kaohsiung, Taiwan | Taiwan Chlorine Industries, Ltd. | ||||||||||||
Westlake Canada Inc. | Toronto, Canada | Westlake Pipe & Fittings, Westlake Royal Building Products, Royal Building | ||||||||||||
| Westlake Chemical Canada Inc. | Montreal, Canada | Westlake Chemical Canada Inc. | ||||||||||||
| Westlake Chemical OpCo LP | Delaware | Westlake Chemical OpCo LP | ||||||||||||
| Westlake Chemical Partners GP LLC | Delaware | Westlake Chemical Partners GP LLC | ||||||||||||
| Westlake Chemical Partners LP | Delaware | Westlake Chemical Partners LP | ||||||||||||
| Westlake Chemicals & Vinyls LLC | Delaware | Westlake Chemicals & Vinyls LLC | ||||||||||||
| Westlake Compounds LLC | Delaware | Westlake Compounds LLC | ||||||||||||
Westlake DaVinci Roofscapes L.L.C. | Delaware | Westlake DaVinci Roofscapes L.L.C. | ||||||||||||
| Westlake Dimex LLC | Delaware | Westlake Dimex LLC | ||||||||||||
| Westlake Epoxy B.V. | Rotterdam, The Netherlands | Westlake Epoxy B.V. | ||||||||||||
| Westlake Epoxy GmbH | Duisburg, Germany | Westlake Epoxy GmbH | ||||||||||||
| Westlake Epoxy Inc. | Delaware | Westlake Epoxy Inc. | ||||||||||||
| Westlake Germany GmbH & Co. KG | Ismaning, Germany | Westlake Germany GmbH & Co. KG | ||||||||||||
| Westlake International I B.V. | Rotterdam, The Netherlands | Westlake International I B.V. | ||||||||||||
| Westlake Longview Corporation | Delaware | Westlake Longview Corporation | ||||||||||||
Westlake Management (Shanghai) Co. Ltd | Shanghai, China | Westlake Management (Shanghai) Co. Ltd | ||||||||||||
| Westlake Management Services, Inc. | Delaware | Westlake Management Services, Inc. | ||||||||||||
| Westlake Natrium LLC | Delaware | Westlake Eagle Natrium LLC | ||||||||||||
| Westlake Petrochemicals LLC | Delaware | Westlake Petrochemicals LLC | ||||||||||||
Westlake Pipe & Fittings Corporation | Delaware | Westlake Pipe and Fittings Corporation | ||||||||||||
| Westlake Polymers LLC | Delaware | Westlake Polymers LLC | ||||||||||||
| Westlake Royal Building Products (USA) Inc. | Delaware | Westlake Royal Building Products (USA) Inc. | ||||||||||||
Westlake Royal Building Products Inc. | Delaware | Westlake Royal Building Products Inc. | ||||||||||||
Westlake Royal Roofing LLC | Delaware | Westlake Royal Roofing LLC | ||||||||||||
Westlake Royal Stone LLC | Delaware | Westlake Royal Stone LLC | ||||||||||||
| Westlake Royal Windows LLC | Delaware | Westlake Royal Windows LLC | ||||||||||||
| Westlake Styrene LLC | Delaware | Westlake Styrene LLC | ||||||||||||
| Westlake Switzerland GmbH | Baas, Switzerland | Westlake Switzerland GmbH | ||||||||||||
| Westlake US 2 LLC | Delaware | Westlake US 2 LLC | ||||||||||||
| Westlake Vinnolit GmbH & Co. KG | Ismaning, Germany | Westlake Vinnolit GmbH & Co. KG | ||||||||||||
| Westlake Vinnolit Holdings GmbH | Ismaning, Germany | Westlake Vinnolit Holdings GmbH | ||||||||||||
| Westlake Vinnolit Italia S.r.L. | Milan, Italy | Westlake Vinnolit Italia S.r.L. | ||||||||||||
| Westlake Vinnolit Limited | Runcorn, United Kingdom | Westlake Vinnolit Limited | ||||||||||||
| Westlake Vinnolit Treuhand GmbH | Ismaning, Germany | Westlake Vinnolit Treuhand GmbH | ||||||||||||
| Westlake Vinyls Company LP | Delaware | Westlake Vinyls Company LP | ||||||||||||
| Westlake Vinyls, Inc. | Delaware | Westlake Vinyls, Inc. | ||||||||||||
| WPT LLC | Delaware | WPT LLC | ||||||||||||