| Symbol | Name | Country | Exchange |
|---|---|---|---|
| CTBG | Coil Tubing Technology Inc | US | OTC |
| CTTOF | CTT - Correios De Portugal, S.A | US | OTC |
| QMCI | Quotemedia Inc | US | OTC |
| CTT | CTT Correios de Portugal SA | PT | LS |
| C7T | CTT - Correios De Portugal S.A | DE | F |
| 0QIM | CTT Correios de Portugal SA | GB | LSE |