| Abbreviation | Definition |
|---|---|
| PRLN | Paracelsian, Incorporated (de-listed) |
| PRLN | Paracelsian, Incorporated (de-listed) |
| PRLNW | Paracelsian, Inc. Warrants |
| PRLNW | Paracelsian, Incorporated Warrants (de-listed) |
| PRLNW | Paracelsian, Incorporated Warrants (de-listed) |
| PRLS | Peerless Systems Corporation |
| PRLX | Parlex Corporation |
| PRMC | Prime Companies, Inc. |
| PRME | Prime Response |
| PRMNF | Pacific Rim Mining Corporation |
| PRMO | Promotions.Com, Inc. |
| PRMX | Primex Technologies, Inc. |
| PRMX | Primex Technologies, Incorporated |
| PRNS | Prins Recycling, Incorporated (de-listed) |
| PRNS | Prins Recycling, Incorporated (de-listed) |
| PRNSQ | Prins Recycling, Inc. (in bankruptcy) |
| PRNT | Printron, Inc. |
| PROA | Polymer Research Corporation of America |
| PROE | Pro Elite, Inc. |
| PROG | Programmers Paradise, Inc. |