| Company name | Reg. code |
|---|---|
| OPUS & OPES OÜ | 12995034 |
| OPUS OÜ | 10522047 |
| OPES OÜ | 12241068 |
| OPUS EXCELLENCE OÜ | 16615077 |
| IDEA OPUS OÜ kustutatud | 12344710 |
| OPUS BLOC OÜ | 17335450 |
| OPUS11 VC OÜ | 16444816 |
| OPUS INVEST OÜ | 16862597 |
| OPUS TECH OÜ | 14605706 |
| OPUS SCIENTIA OÜ | 14830490 |
| OPUS DIGITAL OÜ | 17172586 |
| OPUS ONLINE OÜ (former name Opus Development OÜ) | 16115975 |
| FRACTAL OPUS OÜ | 14885670 |
| OPUS EST OÜ | 10932779 |
| OPUS FRIGUS OÜ | 14224022 |
| OPUS MAGNUM OÜ kustutatud | 12736953 |
| OPUS MUSICUS OÜ | 14504980 |
| OPUS AUTO OÜ | 12147866 |
| PARTUM OPUS OÜ kustutatud | 16307189 |
| OPUS BONA OÜ kustutatud | 12500481 |
| OPUS LINGUA OÜ | 12843092 |
| OPES AGENCY OÜ | 12833171 |
| OPES ASSETS OÜ | 17000843 |
| OPES ESTATE OÜ kustutatud | 17104962 |
| OPES SOLUTIONS OÜ kustutatud | 17104979 |
| OPES KAPITAL OÜ (former name Soodsaim Sõit OÜ) | 12474884 |
| ED OPES OÜ kustutatud | 12977467 |
| DOMINUS OPES OÜ | 17155327 |
| OPES ONE OÜ kustutatud | 14528420 |
| AUREVEST OPES OÜ | 17223610 |
| MS OPES OÜ | 12728333 |
| OPES INVEST OÜ | 12731683 |
| OPES CONSULT OÜ | 11550436 |
| DUKAT OPES OÜ | 12824249 |
| OPS OÜ | 12026571 |
| OPS42 OÜ | 14874292 |
| OPUS11 VC SPV1 OÜ | 16471300 |
| AD REM OPUS OÜ | 12607658 |
| MAGNUM OPUS ALKEEMIA OÜ | 16266355 |
| HARA OPES CONSULTING OÜ | 17039271 |
| OPIS UREDAJA OÜ kustutatud | 10265308 |
| OPIS BOREALIS OÜ | 14154617 |
| BALTIC OPS OÜ kustutatud | 16220353 |
| OPS VEEGA OÜ | 12435654 |
| OPS4SEC OÜ | 16071060 |
| SM4OPS OÜ | 16887011 |
| BLOK OPS OÜ kustutatud | 14835487 |
| TM OPS OÜ kustutatud | 12395423 |
| OPS EST OÜ | 14571002 |
| IQ OPS OÜ | 16322071 |