| CVLG | Covenant Logistics Group |
| HTLD | Heartland Express |
| KNX | Knight-Swift Transportation |
| MRTN | Marten Transport |
| ODFL | Old Dominion Freight Line |
| PTSI | P.A.M. Transportation Services |
| SAIA | Saia |
| SNDR | Schneider National |
| ULH | Universal Logistics |
| WERN | Werner Enterprises |