| Symbol | Name | Country | Exchange |
|---|---|---|---|
| TEF | Telefonica SA | US | NYSE |
| IQST | Iqstel Inc. | US | OTC |
| TRKNY | Turk Telekomunikasyo | US | OTC |
| TTKOM | Turk Telekomunikasyon AS | TR | IS |
| 033050 | Jeong Moon Information. Co. Ltd | KR | KQ |
| 078350 | Hanyang Digitech Co. Ltd | KR | KQ |
| TEF | Telefonica | ES | MC |
| 6229 | V-Tac Technology Co Ltd | TW | TWO |
| 54GA | SANGOMA TEC. | DE | F |
| TNE2 | Telefónica S.A | DE | F |
| TNE5 | Telefónica S.A | DE | F |
| STC | Sangoma Technologies Corp | CA | TO |
| TNE5 | Telefónica S.A | DE | XETRA |
| 0TDE | Telefonica | GB | LSE |
| TEFN | Telefónica S.A | MX | MX |