EXHIBIT 21
SUBSIDIARIES OF WESTLAKE CORPORATION *
Name of Subsidiary | State or Other Jurisdiction of Incorporation or Organization | Names Doing Business | ||||||||||||
Axiall Canada, Inc. | Canada | Axiall Canada, Inc. | ||||||||||||
Axiall, LLC | Delaware | Axiall, LLC | ||||||||||||
DaVinci Roofscapes, L.L.C. | Kansas | DaVinci Roofscapes, L.L.C. | ||||||||||||
Westlake Dimex LLC | Delaware | Dimex LLC | ||||||||||||
Eagle Natrium LLC | Delaware | Eagle Natrium LLC | ||||||||||||
Eagle Spinco Inc. | Delaware | Eagle Spinco Inc. | ||||||||||||
Eagle US 2 LLC | Delaware | Eagle US 2 LLC | ||||||||||||
LASCO Fittings, LLC | Delaware | LASCO Fittings, LLC | ||||||||||||
North American Pipe Corporation | Delaware | North American Pipe Corporation and NAPCO | ||||||||||||
North American Specialty Products LLC | Delaware | North American Specialty Products LLC | ||||||||||||
Plastic Trends, Inc. | Michigan | Plastic Trends, Inc. | ||||||||||||
Rome Delaware Corp. | Delaware | Rome Delaware Corp. | ||||||||||||
Royal Building Products (USA) Inc. | Delaware | Royal Building Products (USA) Inc. | ||||||||||||
Royal Group, Inc./Groupe Royal, Inc. | Canada | Royal Group, Inc., Groupe Royal, Inc. Produits de Bâtiment Royal, Royal Building Products, Royal Building Solutions, Roytec Vinyl and NAPCO Royal Pipe & Fittings | ||||||||||||
Taiwan Chlorine Industries Ltd. | Taiwan | Taiwan Chlorine Industries Ltd. | ||||||||||||
Vinnolit Benelux-France B.V.B.A. | Dendermonde, Belgium | Vinnolit Benelux-France B.V.B.A. | ||||||||||||
Vinnolit GmbH & Co. KG | Ismaning, Germany | Vinnolit GmbH & Co. KG | ||||||||||||
Vinnolit Holdings GmbH | Ismaning, Germany | Vinnolit Holdings GmbH | ||||||||||||
Vinnolit Italia S.r.L. | Milan, Italy | Vinnolit Italia S.r.L. | ||||||||||||
Vinnolit Limited | United Kingdom | Vinnolit Limited | ||||||||||||
Vinnolit Monomer Geschäftsführungs GmbH | Ismaning, Germany | Vinnolit Monomer Geschäftsführungs GmbH | ||||||||||||
Vinnolit Treuhand GmbH | Ismaning, Germany | Vinnolit Treuhand GmbH | ||||||||||||
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 Compounds LLC | Delaware | Westlake Compounds LLC | ||||||||||||
Westlake Germany GmbH & Co. KG | Germany | Westlake Germany GmbH & Co. KG | ||||||||||||
Westlake International I B.V. | The Netherlands | Westlake International I B.V. | ||||||||||||
Westlake Longview Corporation | Delaware | Westlake Longview Corporation | ||||||||||||
Westlake Management Services, Inc. | Delaware | Westlake Management Services, Inc. | ||||||||||||
Westlake Petrochemicals LLC | Delaware | Westlake Petrochemicals LLC | ||||||||||||
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Westlake Polymers LLC | Delaware | Westlake Polymers LLC | ||||||||||||
Westlake Royal Building Products Inc. | Delaware | Westlake Royal Building Products Inc. and Boral Building Products Inc | ||||||||||||
Westlake Royal Roofing LLC | Delaware | Westlake Royal Roofing LLC and Boral Roofing LLC | ||||||||||||
Westlake Royal Stone LLC | Delaware | Westlake Royal Stone LLC and Boral Stone Products LLC | ||||||||||||
Westlake Royal Windows LLC | Delaware | Westlake Royal Windows LLC and Boral Windows LLC | ||||||||||||
Westlake Styrene LLC | Delaware | Westlake Styrene LLC | ||||||||||||
Westlake Switzerland GmbH | Switzerland | Westlake Switzerland GmbH | ||||||||||||
Westlake Vinyls Company LP | Delaware | Westlake Vinyls Company LP | ||||||||||||
WPT LLC | Delaware | WPT LLC | ||||||||||||
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* Westlake has elected to omit the names of certain subsidiaries. None of the omitted subsidiaries, considered either alone or together with the other omitted subsidiaries of its immediate parent, constitutes a “Significant Subsidiary” as set forth in Section 601(b)(21) of Regulation S-K.
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