| Abbreviation | Definition |
|---|---|
| CLIC | Calico Commerce, Inc. |
| CLKB | Clark Bardes Holdings, Inc. (delisted) |
| CLKS | Click2Learn.Com, Inc. |
| CLNB | Calnet Business Bank, N. A., of California |
| CLNFV | Jacor Communications, Inc. (delisted) |
| CLNTF | Clearnet Communications, Inc. |
| CLOC | Camarillo Community Bank |
| CLOL | Classified OnLine.Com, Inc. |
| CLOPF | Clipclop.Com Enterprises |
| CLPA | Cell Pathways |
| CLPA | Cell Pathways, Inc. |
| CLPHY | C L P Holdings, LTD. |
| CLPR | Caliper Technologies |
| CLPT | Cellpoint, Inc. |
| CLPZF | Colossal Resources Corporation |
| CLRC | Colorcs Corporation |
| CLRI | Clariti Telecom International, LTD. |
| CLRN | Clarent Corporation |
| CLRS | Clarus Corporation |
| CLRT | Celerity Systems, Inc. |