| 1 | USPX | U.S. Phosphoric Products Corp. | 7/1935-4/1938 | | NAKINA |
| 2 | USPX | U.S. Phosphoric Products-Division Tennessee Corp. | 1/1941-1/1946 | | NAKINA |
| 3 | USPX | U.S. Pipe and Foundry Co. | added 1/1960; 4/1961-10/1966; eliminated 4/1970 | | NAKINA |
| 4 | USPX | U.S. Plastics Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 5 | USPX | U.S. Phosphoric Products Corp. | Apr-38 | | NRHS |
| 6 | USPX | U.S. Pipe and Foundry Co. | added 1/60; 4/61-10/66; eliminated 4/70 | | NRHS |
| 7 | USPX | U.S. Plastics Corp. | 1/94-7/2000 | | NRHS |
| 8 | USPX | *U. S. PHOSPHORIC PRODUCTS, DIV. TENNESSEE CORP. | | | PWRC |
| 9 | USPX | *U. S. PIPE & FOUNDRY CO. | | | PWRC |
| 10 | USPX | *U. S. PLASTICS CORPORATION | | | PWRC |
| 11 | USPX | US Plastics Corporation | | | RSRV |
| 12 | USPX | US PLASTICS CORPORATION | | | SCAC4 |
