EXHIBIT 21 Subsidiaries of Hub Group, Inc. SUBSIDIARIES JURISDICTION OF INCORPORATION/ORGANIZATION Hub City Terminals, Inc. Delaware Hub Group Atlanta, LLC Delaware Hub Group Boston, LLC Delaware Hub Group Canada, LP Delaware Hub Group Cleveland, LLC Delaware Hub Group Detroit, LLC Delaware Hub Group Florida, LLC Delaware Hub Group Golden Gate, LLC Delaware Hub Group Indianapolis, LLC Delaware Hub Group Kansas City, LLC Delaware Hub Group Los Angeles, LLC Delaware Hub Group Mid-Atlantic, LLC Delaware Hub Group New Orleans, LLC Delaware Hub Group New York State, LLC Delaware Hub Group New York-New Jersey, LLC Delaware Hub Group North Central, LLC Delaware Hub Group Ohio, LLC Delaware Hub Group Pittsburgh, LLC Delaware Hub Group Portland, LLC Delaware Hub Group St. Louis, LLC Delaware Hub Group Tennessee, LLC Delaware Hub City Texas, L.P. Delaware Hub Group Associates, Inc. Illinois Hub Highway Services Illinois Hub Group Distribution Services, L.L.C. Illinois Q.S. of Illinois, LLC Michigan Q.S.S.C., Inc. Delaware Quality Services L.L.C. Missouri Quality Services of Kansas, L.L.C. Kansas Quality Services of New Jersey, L.L.C. New Jersey Q.S. of Georgia, L.L.C. Georgia HLX Company, L.L.C. Delaware Hub Chicago Holdings, Inc. Delaware