| Company name | Reg. code |
|---|---|
| ULTRAVA OÜ | 17471442 |
| ULTREIA OÜ (former name Beatitas Invest OÜ) | 12600538 |
| ULTRAMAN OÜ kustutatud | 12468582 |
| ULTRAMAA OÜ | 16702891 |
| ULTRAX OÜ | 10081488 |
| ULTRALAB DIGITAL OÜ kustutatud | 12068012 |
| ULTRA OÜ | 11808828 |
| ULTRAS ARTWORKS OÜ kustutatud | 14546108 |
| GSX ULTRAN OÜ kustutatud | 11875569 |
| VENNAD ULTRAD OÜ | 12456934 |
| JTK ULTRADE GROUP OÜ | 14786139 |
| ULTRA BIZ OÜ | 16424742 |
| ULTRA CORPORATION OÜ | 14442084 |
| ULTRA PIPE OÜ kustutatud | 12191361 |
| ULTRA RETAIL OÜ | 12924666 |
| PLUS ULTRA OÜ | 16219870 |
| ULTRA INVEST OÜ | 12025809 |
| ULTRA STELLAR OÜ | 16197178 |
| ULTRA KAUBANDUS OÜ kustutatud | 10294793 |
| ULTRA ELEKTRIJAAM 3 OÜ (former name Ultra Wind OÜ) | 12585916 |
| ULTRA AD OÜ | 14857112 |
| ULTRA ELEKTRIJAAM 2 OÜ (former name Sauria Services OÜ) | 12691759 |
| ULTRA LIGHT OÜ | 12358379 |
| ABC ULTRA OÜ (former name AE Ultra) | 11786274 |
| ULTRA TRANS OÜ | 10974513 |
| ULTRA STUDIOS OÜ | 16605337 |
| ULTRA B OÜ | 17357261 |
| ULTRA TRADE OÜ kustutatud | 12276820 |
| ULTRA WINDPOWER OÜ | 16565158 |
| ULTRA SYSTEMS OÜ (former name Sauria System OÜ) | 12413813 |
| ULTRA ELEKTRIJAAM 1 OÜ (former name Sailfriend OÜ) | 14486584 |
| ULTRA ELECTRIC OÜ (former name SOOKRAFT OÜ) | 14787954 |
| ULTRA LUX OÜ | 17246389 |
| ULTRA-NUTRA EU OÜ | 17241765 |
| NE PLUS ULTRA OÜ kustutatud | 14847823 |
| ULTRA COOL TECH OÜ | 16968985 |
| TUJU ON ULTRA OÜ | 14563304 |
| PLUS ULTRA KONSULTATSIOONID OÜ | 17120317 |
| ULTRA TENDENCY CAPITAL OF ESTONIA OÜ | 14932374 |
| OSTRAVA OÜ kustutatud | 12272821 |
| ALTRAHVA OÜ | 16209370 |
| ALTRIVA OÜ | 17363563 |