| Company name | Reg. code |
|---|---|
| HOPSIUM OÜ | 14061011 |
| HOLMIUM OÜ (former name Holmium UÜ) | 16877640 |
| OPIUM OÜ | 10908025 |
| OPTIUM GRUPP OÜ | 10301843 |
| OPTIUM INVEST OÜ kustutatud | 10760083 |
| HOTTIUM SPECULATIVE INVESTMENTS OÜ | 14388597 |
| OPIUM.PRO OÜ | 16033303 |
| OPIUM WORLD OÜ | 16065817 |
| STYLEHOME COMPANY OÜ kustutatud (former name Holmium OÜ) | 12142314 |
| KIGUNGU BUGONGA OÜ (former name Opium Lounge OÜ) | 14766579 |