<PAGE>   1
Exhibit 21 -- Subsidiaries of the Registrant

Name                                         State of Incorporation
----                                         ----------------------

Gulf Northern Transport, Inc.                      Wisconsin
Mencor, Inc.                                       Arkansas
UST Logistics, Inc.                                Florida
Prostar, Inc.                                      South Carolina



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission