| 1 | PHPX | Virginia-Carolina Chemical Corp., Chemicals Division | 1/1943 | | NAKINA |
| 2 | PHPX | Virginia-Carolina Chemical Corp., Phosphate Products Division | 7/1937-1/1941 | | NAKINA |
| 3 | PHPX | Phosphate Products Corp. | 7/1935 | | NAKINA |
| 4 | PHPX | Phosphate Products Division (Virginia-Carolina Chemical Corp., Phosphate Products Division) | Apr-38 | | NRHS |
| 5 | PHPX | VIRGINIA-CAROLINA CHEMICAL CORP., cHEMICALS DIV. [PHOSPHATE PRODUCTS DIV.] | | | PWRC |
