| Abbreviation | Definition |
|---|---|
| CN | Calton, Inc. |
| CNPA | Crown Central Petroleum Corporation Class A |
| CNPB | Crown Central Petroleum Corporation Class B |
| CNU | Continucare Corporation |
| CNV | C V F Technologies Corporation |
| CNY | Carver Bancorp, Inc. |
| COB | Columbia Labs, Inc. |
| COI | Cogent Communications Group, Inc. |
| COI | Cogent Communications Group, Incorporated (de-listed) |
| COI | Cogent Communications Group, Incorporated (de-listed) |
| CPH | Capital Pacific Holdings, Inc. |
| CPI | Capital Properties, Inc., of Rhode Island |
| CQPPA | Quad City Holdings Capital Trust I |
| CRV | Coast Distribution Systems |
| CRV | Customer Received Verification |
| CSA | Careside, Inc. |
| CSM | Merrill Lynch & Company, Inc. |
| CTE | Cardiotech International, Inc. |
| CTK | Comptek Research, Inc. |
| CTO | Consolidated Tomoka Land Company |