| 1 | MNPX | Morton International, Inc. | added 4/1997; 7/2000; eliminated 7/2003 | | NAKINA |
| 2 | MNPX | Morton Salt-Division of Morton Thiokol, Inc. | added 4/1987; 1/1994; eliminated 4/1997 | | NAKINA |
| 3 | MNPX | Morton Salt-Division of Morton Norwich Products, Inc. | added 10/1981; eliminated 4/1987 | | NAKINA |
| 4 | MNPX | Morton Salt-Division Norwich Products, Inc. | added 7/1981; eliminated 10/1981 | | NAKINA |
| 5 | MNPX | Morton Salt Co. | added 7/1980; eliminated 7/1981 | | NAKINA |
| 6 | MNPX | Morton Salt Co. | added 7/80; eliminated 7/81 | | NRHS |
| 7 | MNPX | Morton Salt-Division Norwich Products, Inc. | added 7/81; eliminated 10/81 | | NRHS |
| 8 | MNPX | Morton Salt-Division of Morton Norwich Products, Inc. | added 10/81; eliminated 4/87 | | NRHS |
| 9 | MNPX | Morton Salt-Division of Morton Thiokol, Inc. | added 4/87; 1/94; eliminated 4/97 | | NRHS |
| 10 | MNPX | Morton International, Inc. | added 4/97; 7/2000 | | NRHS |
| 11 | MNPX | MORTON INTERNATIONAL, INC. [MORTON SALT-DIV MORTON NORWICH PROD.INC.] | | | PWRC |
| 12 | MNPX | Morton Norwich Products (Morton International) | | | RSRV |