| Company name | Reg. code |
|---|---|
| K4 ESTONIA OÜ | 17012059 |
| K9 GROOMING ESTONIA OÜ | 14298500 |
| S&K ESTONIA OÜ | 12286958 |
| K-1 ESTONIA KICKBOXING AND BOXING ACADEMY OÜ | 17155184 |
| K.P. FITTER AND ASSOCIATES ESTONIA OÜ kustutatud (former name WESTSIDE INSPECTION COMPANY OÜ) | 14248525 |
| ZAVE ENERGY GROUP OÜ (former name K2 Estonia OÜ) | 16018605 |
| KAUTAS PARTNERS OÜ kustutatud (former name Spot Estonia OÜ) | 12553263 |
| CIRCLE K TRANSPORT EESTI OÜ (former name K Transport Eesti OÜ) | 14076076 |
| KLD ESTONIA OÜ kustutatud | 12550421 |
| KSM ESTONIA OÜ (former name NRT Rakennus Ryhmä OÜ) | 14345889 |
| KCS ESTONIA OÜ kustutatud | 14408650 |
| KIB ESTONIA OÜ | 17126679 |
| KIP ESTONIA OÜ kustutatud | 10090435 |
| ESTONIAN KV OÜ | 14375583 |
| KVAB ESTONIA OÜ kustutatud | 14336991 |
| KMFC ESTONIA OÜ | 14277886 |
| KIWA ESTONIA OÜ (former name Inspecta Estonia OÜ) | 10543517 |
| KEYM ESTONIA OÜ kustutatud | 11732999 |
| KARG ESTONIA OÜ | 16227384 |
| KEYDS ESTONIA OÜ kustutatud | 14030654 |
| KINGS ESTONIA OÜ kustutatud | 12847828 |
| KAQUN ESTONIA OÜ kustutatud | 14987292 |
| KUNGA ESTONIA OÜ | 16823656 |
| KUUKI ESTONIA OÜ | 16575777 |
| KALKBO ESTONIA OÜ (former name Preceedo Projects OÜ) | 14352085 |
| KAKADU ESTONIA OÜ kustutatud | 12759888 |
| KIT CAR ESTONIA OÜ | 12720461 |
| KSPACE KLABS ESTONIA OÜ | 17315067 |
| KINDRED ESTONIA OÜ | 16105362 |
| KUKIRIN ESTONIA OÜ | 17226866 |
| KRISMAR ESTONIA OÜ | 17215816 |
| KAMARCO ESTONIA OÜ kustutatud (former name osaühing KARNE VK) | 10256962 |
| KEO SANG ESTONIA OÜ | 12430438 |
| KUTALAB ESTONIA OÜ | 12415692 |
| KRAUSEN ESTONIA OÜ | 11622667 |
| KYNDRYL ESTONIA OÜ (former name IBM Managed Infrastructure Services Estonia OÜ) | 16188313 |
| KFS GROUP ESTONIA OÜ | 17401909 |
| KRL GROUP ESTONIA OÜ kustutatud (former name KRL Group UÜ) | 14077130 |
| KIHEITAI ESTONIA OÜ kustutatud | 16301137 |
| KARBOHIM ESTONIA OÜ kustutatud | 12884205 |
| KYSTLINK ESTONIA OÜ kustutatud | 11432091 |
| KAT METAL ESTONIA OÜ | 14111163 |
| KNITWIRE ESTONIA OÜ | 14687124 |
| KIDSLAND ESTONIA OÜ | 14550261 |
| KAYAKING ESTONIA OÜ kustutatud | 14543589 |
| KARMSUND ESTONIA OÜ (former name Marine Aluminium Industries OÜ) | 10863736 |
| KJK SPORTS ESTONIA OÜ kustutatud | 16259898 |
| KONDOR & CO ESTONIA OÜ | 16555579 |
| KAZAK GROUP ESTONIA OÜ kustutatud | 12443760 |
| KOPPARBERG ESTONIA OÜ | 12123908 |