| 1 | WOX | Warren Oil Co. of Pennsylvania | 8/1920 | | NAKINA |
| 2 | WOX | Warden Oil Co. | 7/1932-1/1943; 1/1945 (not listed) | | NAKINA |
| 3 | WOX | General American Transportation Corp. | 1/1950-1/1952; eliminated 10/1953 | | NAKINA |
| 4 | WOX | Warden Oil Co. | Apr-38 | | NRHS |
| 5 | WOX | General American Transportation Corp. | 1/52; eliminated 10/53 | | NRHS |
| 6 | WOX | *WARREN OIL CO. OF PENNSYLVANIA | | | PWRC |
| 7 | WOX | *WARDEN OIL CO. | | | PWRC |
| 8 | WOX | *GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 9 | WOXL | WEBB ONE XPRESS L L C | | | SCAC4 |