| Abbreviation | Definition |
|---|---|
| CYCHZ | Cybercash, Inc. |
| CYCL | Centennial Communications |
| CYCL | entennial Communications |
| CYCO | Cypress Communications, Inc. |
| CYDS | Cygne Designs, Inc. |
| CYGE | Cygene Laboratories, Inc. |
| CYGE | Cygene Laboratories, Incorporated (de-listed) |
| CYGE | Cygene Laboratories, Incorporated (de-listed) |
| CYGN | Cygnus, Inc. |
| CYII | Cycomm International, Inc. |
| CYLK | Cylink Corporation |
| CYMI | Cymer, Inc. |
| CYNE | Cynet, Inc. |
| CYNRZ | Canyon Resources Corporation (delisted) |
| CYOE | Coyote Network Systems, Inc. |
| CYPB | Cypress Bioscience, Inc. |
| CYPBU | Cypress Bioscience, Inc. |
| CYPBW | Cypress Bioscience, Inc. Warrants |
| CYPH | Cytoclonal Pharmaceuticals, Inc. |
| CYPHW | Cytoclonal Pharmaceuticals, Inc. Warrants |