| Company name | Reg. code |
|---|---|
| TBK OÜ kustutatud | 12197692 |
| TBK SOLUTIONS OÜ | 16778049 |
| TBK LAHENDUSED OÜ | 14318697 |
| ERMA ARENDUS OÜ (former name TBK Holding OÜ) | 14397366 |
| TIK-TAK OÜ | 10296562 |
| TBE OÜ | 12674028 |
| IBK OÜ kustutatud | 14829713 |
| BTK OÜ | 14182080 |
| TKK OÜ | 12975758 |
| HBK OÜ kustutatud | 16702690 |
| JTBK OÜ | 17364278 |
| TBX OÜ | 17385837 |
| TDK OÜ | 16622040 |
| TOK OÜ | 14303129 |
| TGK OÜ | 16566726 |
| TLK OÜ (former name TT Academy OÜ) | 11062234 |
| TRK OÜ | 10831601 |
| TBL OÜ (former name TBL Tartu OÜ) | 12220922 |
| TBC OÜ kustutatud | 12430527 |
| TPK OÜ | 17024938 |
| PBK OÜ kustutatud | 14430508 |
| TJK OÜ | 12393200 |
| BBK OÜ | 16247725 |
| TLK+1 OÜ kustutatud | 14283065 |
| TMK CONSULTING OÜ kustutatud | 14739461 |
| TBG CONSULTING OÜ | 17359082 |
| TLK LAB OÜ | 16263173 |
| TRK CONSULTING OÜ | 14832000 |
| TFK INVESTMENTS OÜ | 16988108 |
| TFK HOLDINGS OÜ | 16988539 |
| TKB INTERNATIONAL OÜ | 16181363 |
| TKB CONSULTING OÜ kustutatud | 16484299 |
| TSK TRADE OÜ | 12770370 |
| TBC INTERNATIONAL OÜ (former name The Best Company OÜ) | 16811321 |
| TLK INVESTMENTS OÜ | 16468159 |
| TLK PRIVAAT OÜ | 12470969 |
| TBW SPV OÜ kustutatud | 16037755 |
| CBK CONSULT OÜ kustutatud | 12878587 |
| CBK ESTONIA OÜ kustutatud | 14786961 |
| 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 |
| ABK ELEKTROONIKA OÜ | 10328322 |
| GEOS TEK OÜ | 10854602 |
| TEK5 EST OÜ (former name Tähevara OÜ) | 12789257 |
| TRK TEENUSTE OÜ | 11227416 |
| RBK TECHNOLOGIES OÜ | 14127425 |
| INTOR BTK OÜ | 17226694 |