| Company name | Reg. code |
|---|---|
| 6K CO OÜ | 16997998 |
| K & CO BUILD OÜ | 16691259 |
| K+CO STUUDIO OÜ | 16411320 |
| K&M CO GROUP OÜ kustutatud | 14464200 |
| K&G LEGACY CO. OÜ | 17168494 |
| G.T.K. CO. OÜ kustutatud | 16250590 |
| K&J&CO EST OÜ | 12795157 |
| PROESTATE OÜ (former name K&R CO OÜ) | 14279684 |
| KD CO. OÜ | 14286827 |
| KM CON OÜ | 17336448 |
| KMA & CO OÜ | 16614974 |
| KRM & CO OÜ | 11986620 |
| KKK CO. OÜ (former name KKK Co OÜ) | 14689301 |
| KWF & CO. OÜ | 16836315 |
| KINK & CO OÜ | 16178591 |
| KLUG & CO OÜ kustutatud | 11777312 |
| KONT & CO OÜ | 14399537 |
| KARAM CO OÜ | 17364953 |
| KÄRU & CO OÜ (former name IWW Invest OÜ) | 11276194 |
| COLON KV OÜ | 16424819 |
| KRIMM CO OÜ (former name Krimm Computers OÜ) | 14839634 |
| KS & CO CONSULTING OÜ kustutatud | 16312983 |
| KK CON SPV OÜ | 16243621 |
| KRAB CORP OÜ kustutatud | 16069270 |
| COTONS KV OÜ | 10334618 |
| KEREM & CO OÜ kustutatud | 16398654 |
| KUUSE & CO OÜ | 11078502 |
| KOURI & CO OÜ kustutatud | 12140367 |
| KEVAG & CO OÜ | 14992844 |
| COBRA KAI OÜ | 17007667 |
| KASCH & CO OÜ | 10680314 |
| K AND K COMPANY OÜ | 17232950 |
| CONFERE KK OÜ (former name Confere Advokaadibüroo OÜ) | 16608577 |
| KV CONSULT OÜ | 12429501 |
| K5 CONSULT OÜ | 11054097 |
| KN CONSULT OÜ | 16693436 |
| KF CONSULT OÜ | 16416027 |
| KR CONSULT OÜ kustutatud | 12124492 |
| KP CONSULT OÜ kustutatud | 14794794 |
| KB CONSULT OÜ | 16880747 |
| KA COMPANY OÜ | 11491768 |
| KAIROI CO. OÜ | 17410529 |
| COPY KAYLA OÜ | 16675964 |
| KARJUS & CO OÜ | 12677038 |
| KAGU COFEE OÜ | 12037698 |
| KONDOR & CO OÜ | 12944404 |
| KODAN CORP OÜ | 17284036 |
| KR COOKING OÜ | 14975314 |
| KH CONSULT OÜ | 16401008 |
| KELTS & CO. OÜ | 14459972 |