| Company name | Reg. code |
|---|---|
| TYK OÜ | 17196438 |
| RUSLAN TYKHONOV OÜ | 17082568 |
| TIK-TAK OÜ | 10296562 |
| NATALJA TYKHONRAVOVA OÜ | 16516071 |
| TUK-TUK OÜ kustutatud | 12095796 |
| STYK OÜ | 14797901 |
| TKK OÜ | 12975758 |
| TBK OÜ kustutatud | 12197692 |
| TDK OÜ | 16622040 |
| TOK OÜ | 14303129 |
| TGK OÜ | 16566726 |
| TLK OÜ (former name TT Academy OÜ) | 11062234 |
| TRK OÜ | 10831601 |
| TPK OÜ | 17024938 |
| TYY OÜ | 16736246 |
| TJK OÜ | 12393200 |
| TVK OÜ | 14763693 |
| TLK+1 OÜ kustutatud | 14283065 |
| TMK CONSULTING OÜ kustutatud | 14739461 |
| TLK LAB OÜ | 16263173 |
| TRK CONSULTING OÜ | 14832000 |
| TYR INVEST OÜ | 14994955 |
| TFK INVESTMENTS OÜ | 16988108 |
| TFK HOLDINGS OÜ | 16988539 |
| TSK TRADE OÜ | 12770370 |
| TLK INVESTMENTS OÜ | 16468159 |
| TLK PRIVAAT OÜ | 12470969 |
| TBK LAHENDUSED OÜ | 14318697 |
| TJK WORKS OÜ kustutatud | 12682683 |
| TRK INVEST OÜ | 16568725 |
| TEK MANAGEMENT OÜ (former name Uptick trade systems OÜ) | 14614177 |
| TEK HOLDING OÜ | 16082164 |
| TTK ASSETS OÜ | 16574453 |
| TYRK INVEST OÜ | 16307663 |
| GEOS TEK OÜ | 10854602 |
| TEK5 EST OÜ (former name Tähevara OÜ) | 12789257 |
| TRK TEENUSTE OÜ | 11227416 |
| THK CONSULTING OÜ | 14729687 |
| TIK SPORDIMAJA OÜ | 11149455 |
| EPK TEK OÜ (former name EPK Invest OÜ) | 14324427 |
| TDK TRADE OÜ kustutatud | 12751527 |
| LYK ATELJEE OÜ | 12540724 |
| TEK SPACE OÜ kustutatud | 16722646 |
| TEK4 CAP OÜ (former name OliCar Invest OÜ) | 14132478 |
| TAK & BYGGSPECIALISTEN OÜ kustutatud (former name Renevec OÜ) | 14450348 |
| TMK HOOLDUS OÜ kustutatud | 11732717 |
| TLK TEENUSED OÜ | 17391306 |
| TSK METALL OÜ kustutatud | 16123986 |
| TMK HALDUS OÜ (former name Tartu Metsakinnistud OÜ) | 16790949 |
| ORKA TEK OÜ | 17310130 |