EXHIBIT 21
SUBSIDIARIES OF WESTLAKE *
Name of Subsidiary | State or Other Jurisdiction of Incorporation or Organization | Names Doing Business | ||
North American Pipe Corporation | Delaware | North American Pipe Corporation and NAPCO | ||
Van Buren Pipe Corporation | Delaware | Van Buren Pipe Corporation | ||
Westech Building Products, Inc. | Delaware | Westech Building Products, Inc. | ||
Westech Building Products ULC | Canada | Westech Building Products ULC and Westech Building Products Limited | ||
Westlake Ethylene Pipeline Corporation | Delaware | Westlake Ethylene Pipeline Corporation | ||
Westlake Longview Corporation | Delaware | Westlake Longview Corporation | ||
Westlake Management Services, Inc. | Delaware | Westlake Management Services, Inc. | ||
Westlake Petrochemicals LLC | Delaware | Westlake Petrochemicals LLC, Westlake Petrochemicals LP and WPE | ||
Westlake Polymers LLC | Delaware | Westlake Polymers LLC, Westlake Polymers LP and WPE | ||
Westlake PVC Corporation | Delaware | Westlake PVC Corporation | ||
Westlake Styrene LLC | Delaware | Westlake Styrene LLC and Westlake Styrene LP | ||
Westlake Supply and Trading Company | Delaware | Westlake Supply and Trading Company | ||
Westlake Vinyls Company LP | Delaware | Westlake Vinyls Company LP | ||
Westlake Vinyls, Inc. | Delaware | Westlake Vinyls, Inc., Westlake Monomers and WCAO | ||
WPT LLC | Delaware | WPT LLC and WPT LP | ||
Suzhou Huasu Plastics Co., Ltd. ** | People’s Republic of China | Suzhou Huasu Plastics Co., Ltd. and Huasu |
* | 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. |
** | Westlake owns 59% of this entity but accounts for it using the equity method. |