| 1 | NAMX | NAMX Leasing Co. | added 10/1978; 1/1980-7/2005 | | NAKINA |
| 2 | NAMX | National Ammonia Co. | added 7/1978; eliminated 10/1978 | | NAKINA |
| 3 | NAMX | Tank Car Corp. of America | 1/1941-7/1954; eliminated 4/1956 | | NAKINA |
| 4 | NAMX | North American Trading & Import Co. | 7/1930-4/1938 | | NAKINA |
| 5 | NAMX | North American Trading & Import Co. | Apr-38 | | NRHS |
| 6 | NAMX | Tank Car Corp. of America | Jan-52 | | NRHS |
| 7 | NAMX | National Ammonia Co. | added 7/78; eliminated 10/78 | | NRHS |
| 8 | NAMX | NAMX Leasing Co. | added 10/78; 1/80-7/2000 | | NRHS |
| 9 | NAMX | *NORTH AMERICAN TRADING & IMPORT CO. | | | PWRC |
| 10 | NAMX | +NAMX LEASING COMPANY [TANK CAR CORP of AMERICA] | | | PWRC |
| 11 | NAMX | NAMX Leasing | | | RSRV |
| 12 | NAMX | NAMX LEASING COMPANY | | | SCAC4 |
