| ARCB | ArcBest |
| CVLG | Covenant Logistics Group |
| HTLD | Heartland Express |
| KNX | Knight-Swift Transportation |
| MRTN | Marten Transport |
| PTSI | P.A.M. Transportation Services |
| SNDR | Schneider National |
| TFII | TFI |
| ULH | Universal Logistics |
| WERN | Werner Enterprises |
| XPO | XPO Logistics |