Exhibit 21

SUBSIDIARIES OF SWIFT TRANSPORTATION COMPANY¹

Interstate Equipment Leasing, LLC, a Delaware limited liability company

Swift Transportation Co., LLC, a Delaware limited liability company

Swift Transportation Co. of Arizona, LLC, a Delaware limited liability company

Red Rock Risk Retention Group, Inc., an Arizona corporation²

M.S. Carriers, LLC, a Delaware limited liability company

Estrella Distributing , LLC, a Delaware limited liability company

Swift Intermodal, LLC, a Delaware limited liability company

Swift Transportation Co. of Virginia, LLC, a Delaware limited liability company

Common Market Equipment Co., LLC, a Delaware limited liability company

Swift Leasing Co., LLC, a Delaware limited liability company

Sparks Finance LLC, a Delaware limited liability company

Swift Academy LLC, a Delaware limited liability company

Mohave Transportation Insurance Company, an Arizona corporation

Swift Services Holdings, Inc., a Delaware corporation

Swift Transportation Services, LLC, a Delaware limited liability company

Trans-Mex, Inc. S.A. de C.V., a Mexican corporation

Swift Logistics, S.A. de C.V., a Mexican corporation

Swift International S.A. de C.V., a Mexican corporation

TMX Administración, S.A. de C.V., a Mexican corporation

Swift Receivables Company II, LLC, a Delaware limited liability company

1	All subsidiaries are directly or indirectly wholly-owned by Swift Transportation Company. Each subsidiary is directly owned by the entity under which it is listed, unless otherwise noted.
2	Red Rock Risk Retention Group, Inc. is 80% owned by Swift Transportation Company and 19% owned by M.S. Carriers, LLC.