| 1 | PSMX | Esco Industries Inc. d/b/a Performance Seed | 7/2005 (not listed) | | NAKINA |
| 2 | PSMX | Shippers' Car Line Corp. | added 7/1954; 7/1954; eliminated 1/1955 | | NAKINA |
| 3 | PSMX | Pennsylvania Salt Manufacturing Co. | 7/1923-1/1952; eliminated 7/1954 | | NAKINA |
| 4 | PSMX | Pennsylvania Salt Mfg. Co. | 4/38-1/52 | | NRHS |
| 5 | PSMX | *PENNSYLVANIA SALT MANUFACTURING CO. (SHIPPERS' CAR LINE CORP.) | | | PWRC |
| 6 | PSMX | *RETIRED 05-26-92 ATP (6015) [PULLMAN STANDARD MANUFACTURING] | | | PWRC |
| 7 | PSMX | +ESCO INDUSTRIES INC. d/b/a PERFORMANCE SEED | | | PWRC |
| 8 | PSMX | PERFORMANC | | | SCAC4 |
