| 1 | SONX | Sonford Products Corp. | added 1/1965; 7/1965-4/1970; eliminated 4/1971 | | NAKINA |
| 2 | SONX | Agtrans Corp. | added 10/1986; eliminated 7/1991 | | NAKINA |
| 3 | SONX | Soneco Service, Inc. | added 7/1991; eliminated 7/1992; 1/1994-7/2005 (not listed) | | NAKINA |
| 4 | SONX | Sonford Products Corp. | added 1/65; 7/65-4/70; eliminated 4/71 | | NRHS |
| 5 | SONX | Agtrans Corp. | added 10/86; eliminated 7/91 | | NRHS |
| 6 | SONX | Soneco Service, Inc. | added 7/91; eliminated 7/92; 1/94-7/2000 | | NRHS |
| 7 | SONX | *SONFORD PRODUCTS CORP. | | | PWRC |
| 8 | SONX | *AGTRANS CORP. | | | PWRC |
| 9 | SONX | *SONECO SERVICES, INC. | | | PWRC |
| 10 | SONX | Soneco Services | | | RSRV |