| Company name | Reg. code |
|---|---|
| U-SYSTEMS OÜ | 12794152 |
| UET SYSTEMS OÜ | 12315631 |
| ULTRA SYSTEMS OÜ (former name Sauria System OÜ) | 12413813 |
| UNITY SYSTEMS OÜ kustutatud | 10434811 |
| USEFUL SYSTEMS OÜ | 17370540 |
| UNITEL SYSTEMS OÜ | 14949156 |
| UPTIME SYSTEMS OÜ kustutatud | 11332538 |
| UNIFLEX SYSTEMS OÜ (former name UNIFLEX SYSTEMS OSAÜHING) | 10616452 |
| UNMANNED SYSTEMS OÜ kustutatud | 12766345 |
| URBANGARDEN SYSTEMS OÜ | 17459777 |
| ACRUX SYSTEMS UNIVERSE OÜ | 12411808 |
| UNITED FINANCIAL SYSTEMS OÜ kustutatud | 14447265 |
| YOORDEN OÜ (former name Reverato Systems UÜ) | 14140288 |
| SWEDMAX OÜ kustutatud (former name Proflex Systems OÜ) | 14263720 |
| HESTIA KORPORATSIOON OÜ kustutatud (former name Monumentti Systems OÜ) | 16160065 |
| OKOPLUS COMPANY OÜ kustutatud (former name Mextron Systems OÜ) | 16409493 |
| E-SPORT CHALLENGE OÜ kustutatud (former name Soleado Systems OÜ) | 14333372 |
| ASICVAULT CAPITAL OÜ kustutatud (former name Tehnox Systems OÜ) | 14437976 |
| AITELO TECHNOLOGIES OÜ kustutatud (former name Scanvic Systems OÜ) | 14059267 |
| OSATO ENGINEERING 0Ü OÜ kustutatud (former name Stanton Systems OÜ) | 14059416 |
| KARMAB CONSULTING OÜ (former name Elfon Systems OÜ) | 14137211 |
| URBAN PROJECT 0Ü OÜ kustutatud (former name Stanton Systems OÜ) | 14143915 |
| SKYEREX OÜ (former name Avensis Systems OÜ) | 14327199 |
| EMMELIN CONSULTING 0Ü OÜ (former name Acre Systems OÜ) | 14127508 |
| LAKESTORE OÜ (former name Voiman Systems OÜ) | 16394679 |
| UNLIMITED STORAGE SYSTEMS OÜ | 14039158 |
| COMPOTEXA OÜ kustutatud (former name Sgb systems OÜ) | 14444108 |
| GRAPHEREX OÜ (former name Payrow Crypto Exchange Systems OÜ) | 14769678 |
| FLAMEKO LAAGRI OÜ (former name Terocon Systems UÜ) | 14307564 |
| TEK MANAGEMENT OÜ (former name Uptick trade systems OÜ) | 14614177 |
| TIKONKO MAMBOMA OÜ (former name Alexus Systems UÜ) | 16666741 |
| VIDIANA GRUPP OÜ (former name Systemstart UÜ) | 16397330 |
| JTSERVICEMAX OÜ (former name Metal Systems Group UÜ) | 14007715 |
| PARTNERSHIP FOR UNDERSTANDING LEGAL SYSTEMS IN EUROPE OÜ | 17210658 |