| Abbreviation | Definition |
|---|---|
| CINE | Cineworld |
| CIP | Cholet Invest |
| CIU | Cape |
| CKN | Clarkson |
| CKSN | Cookson Group |
| CKSN | Cookson Grp. |
| CLA | Capital Lease |
| CLC | Clinical Computing |
| CLDN | Caledonia Inv. |
| CLEA | Cleardebt Group |
| CLEA | Cleardebt Grp |
| CLF | Cluff Gold |
| CLG | Colgate Palm. |
| CLI | Cls Hdgs |
| CLIG | City Lon Inv |
| CLL | Cello Group |
| CLLN | Carillion |
| CLON | Clontarf |
| CLS | Cheerful Scout |
| CLTV | Cellcast |