| Company name | Reg. code |
|---|---|
| ZTEC OÜ | 14587693 |
| ZTECH ROBOTICS OÜ | 17244031 |
| OZTEC OÜ | 16412354 |
| TEC OÜ | 16875479 |
| ATEC ENGINEERING OÜ kustutatud | 12893109 |
| ITEC EST OÜ kustutatud | 12145169 |
| ATEC UNITRADE OÜ kustutatud | 16191077 |
| ATEC INVEST OÜ | 11344105 |
| ATEC RESEARCH OÜ | 16192450 |
| STEC EUROPE OÜ | 16513871 |
| AZTEC ZEN OÜ kustutatud | 16683662 |
| STEC ESTONIA OÜ | 14058138 |
| ORVOS TEC OÜ | 10168373 |
| KEL-TEC OÜ | 14745005 |
| TEC NORDENGINEERS OÜ | 17376100 |
| DIN-TEC OÜ | 16504518 |
| VAULT-TEC OÜ | 17453384 |
| LULUMARS TEC OÜ | 16480031 |
| SAPPHIRE TEC OÜ kustutatud | 14000765 |
| SVELTE TEC OÜ (former name Svelte Marine OÜ) | 12613854 |
| KE-TEC OÜ kustutatud | 10213932 |
| TEC WELAND OÜ | 16194621 |
| SPARTA TEC OÜ | 16583469 |
| ZEC LEATHER OÜ | 16339108 |
| LUFT-TEC OÜ (former name New Approach OÜ) | 11913554 |
| PRO-TEC ESTONIA OÜ kustutatud | 12038545 |
| AIR TEC BALTIC OÜ | 16274219 |
| NORTH-TEC BALTICS OÜ kustutatud | 12345649 |
| ALL-TEC GROUP OÜ | 14119294 |
| AIR TEC UKRAINE OÜ | 16465557 |
| ALL-TEC SERVICES OÜ kustutatud | 11710420 |
| TRUCK DIESEL TEC OÜ kustutatud (former name Saku Aiameistrid OÜ) | 12878392 |
| E-TEC ELEKTER OÜ | 14776782 |
| LUFT-TEC SERVICE OÜ (former name ELT GROUP OÜ) | 14033055 |
| TEC ELECTRONICS EU OÜ kustutatud | 12760749 |
| TRUCK DIESEL TEC OÜ kustutatud | 12274180 |
| AIR-TEC-SYSTEMS OÜ kustutatud | 11967478 |
| ENERGYMENTOR OÜ (former name GTEC OÜ) | 12666738 |
| MEREKONTEINER OÜ (former name OÜ TEC) | 14153859 |
| RIMTEC OÜ (former name Rim Tec OÜ) | 16709953 |
| GARJANIA JOARIANALA OÜ kustutatud (former name Mast Tec OÜ) | 16177396 |
| AKTIVAPRO RAAMATUPIDAMINE OÜ (former name Hail-TEC Holding OÜ) | 16661324 |
| R&T CAPITAL OÜ (former name Net Tec Eesti OÜ) | 12571713 |
| SERKRUQ OÜ (former name OÜ SerKruq) | 11349680 |
| Q2 POINT AS (former name Sisco Tec Eesti OÜ) | 12657811 |