| Company name | Reg. code |
|---|---|
| KTC OÜ | 16545517 |
| KTC MANAGEMENT OÜ | 16804640 |
| UNITEDPHOTOVOLTAIC OÜ (former name KTC International OÜ) | 14772373 |
| KTCVN CONSULT OÜ | 17149077 |
| KLC OÜ kustutatud | 14614792 |
| ETC OÜ kustutatud | 12249555 |
| KTO OÜ | 11670399 |
| CTC OÜ kustutatud | 14022583 |
| LTC OÜ | 14860284 |
| KTR OÜ | 16358198 |
| NTC OÜ kustutatud (former name Nordic Transport Chemicals OÜ) | 12407942 |
| KTA OÜ | 16770102 |
| KTJ OÜ kustutatud | 12309464 |
| KMC OÜ kustutatud (former name OÜ GREEN TRAVEL) | 11546009 |
| KBC OÜ (former name KB Chemical OÜ) | 10699610 |
| KTÄ OÜ kustutatud | 16561580 |
| KTX OÜ | 10271303 |
| KBC OÜ kustutatud | 10889977 |
| KTH OÜ | 17322506 |
| KMC OÜ | 17143465 |
| KTL OÜ | 12607003 |
| KCC OÜ | 16361504 |
| KTN OÜ | 14560240 |
| KTV OÜ | 11893159 |
| KTI OÜ | 14942259 |
| BTC OÜ | 10308727 |
| KRC OÜ | 16838656 |
| FTC OÜ | 14444151 |
| KLC TEENUSED OÜ | 16625417 |
| ATC SOLUTION OÜ kustutatud | 12708023 |
| KPC TECH OÜ | 14945477 |
| ALUMBRA GTC OÜ kustutatud | 12142082 |
| KTN CONSULT OÜ | 14839060 |
| GTC CONSTRUCTIONS OÜ | 12392790 |
| GROOVESTAR GTC OÜ kustutatud | 11953163 |
| ITAMO ATC OÜ | 14888696 |
| KKC TEGEMISED OÜ | 11163840 |
| GTC CENTRAL OÜ kustutatud | 11740533 |
| KVC FINANCE OÜ (former name Kamprad Venture Capital OÜ) | 12923046 |
| KTD EVENTS OÜ | 17005779 |
| KTR INVEST OÜ kustutatud | 16309515 |
| ETC30C OÜ (former name EEDU SALES CONSULTING OÜ) | 14634168 |
| KTK INVEST OÜ | 16647732 |
| KTH CAPITAL OÜ | 14455323 |
| KTP INVESTMENT OÜ | 16045619 |
| KTS BALTIC OÜ | 10702683 |
| KSC LEGAL OÜ kustutatud | 12198125 |
| APTEEGID KTP OÜ | 14259078 |
| KTI INVESTEERINGUD OÜ | 14470695 |
| KTP CRYPTOTRADING OÜ | 16395294 |