| REPORTING MARKS | COMPANY |
|---|---|
| ABFZ | ABF Freight System |
| ALLZ | Alliance Shippers Inc |
| AMHZ | American Highway Inc |
| AXXZ | Clipper |
| BRNZ | Contrak Logistics |
| CCIZ | Crete Carrier Corp |
| CDAZ | Canadian Tire Corp (private fleet) |
| CDLZ | Cardinal Freight Carriers |
| CEPZ | Continental Express sold to Celadon Group |
| CFWZ | Consolidated Freightways (bankrupt) |
| CLTZ | Cool Tracks |
| CWTZ | Con-Way Truckload Services |
| DEBZ | de Boer |
| DRTZ | Dart Intermodal |
| DTZZ | Direct Transit Inc |
| ENGZ | C. R. England & Sons |
| FEDZ | Federal Express |
| FEXZ | Florida Express Carriers Inc (owned by FEC) |
| FFEZ | Frozen Food Express |
| FSTZ | Fastrac (United Parcel Service) |
| GTIZ | G.T. Intermodal U.S.A. |
| HRAZ | ?? |
| HSFZ | JB Hunt-Santa Fe Quantum Service |
| IDCZ | Interstate Distributor Co. |
| IIIZ | III Transportation |
| IIRZ | III Transportation |
| IMXZ | Intermodal Express Inc. |
| JBHZ | J.B. Hunt |
| JRSZ | J & R Schugel |
| KLMZ | KLLM Transport Services Inc. |
| KNTZ | Timothy Kennedy Inc. |
| KPCZ | K & P Cartage Co |
| MARZ | Martrac (now UPS Logistics Group) |
| MTCZ | Mayflower Transit & Storage |
| MTCZ | Matlack Tranportation Co |
| MTLZ | Marten Transport Ltd. |
| MVTZ | Mesilla Valley Transportation |
| NFIZ | National Freight |
| NLDZ | Northland Trucking Inc |
| NSLZ | Nestle (private fleet) |
| NWTZ | N W Transport (bankrupt) |
| OVNZ | Overnite Transportation Co. |
| PKGZ | TIP (leased United Parcel Service) |
| PAMZ | P.A.M. Transport |
| QMTZ | JB Hunt |
| RDWZ | Roadway Express |
| ROEZ | Roehl Transport Inc |
| RWTZ | Satellite Intermodal Express |
| SAVZ | SAV Express Inc |
| SCSZ | Supply Chain Solutions (United Parcel Service) |
| SNLZ | Schneider National |
| STTZ | Stevens Transport |
| SWFZ | Swift Transportation |
| TDSZ | TransAmerica Distribution Services |
| TTOZ | Totem Ocean Trailer Express |
| TWLZ | Trans West Logistics |
| UPOZ | United Parcel Service |
| UPSZ | United Parcel Service |
| UPWZ | United Parcel Service |
| USXZ | US Xpress |
| WERZ | Werner Enterprises |
| WMLZ | Watkins Motor Lines (bought by FedEx) |
| WOLZ | H. O. Wolding |
| WSLZ | Wiley Sanders Truck Lines Inc |
| WSTZ | West Side Transport Inc |
| WTLZ | WTL Rail Corporation |
| YFSZ | Yellow Freight System |