| Company name | Reg. code |
|---|---|
| BESSI OÜ | 10347555 |
| BESSIA OÜ | 16309857 |
| BESST TECHNOLOGIES OÜ (former name Parmet Solar OÜ) | 12607842 |
| M-BESS OÜ | 16021671 |
| VENTUS BESS OÜ | 17203078 |
| VERDAX BESS OÜ (former name FinoKnots OÜ) | 14950627 |
| CLEO & BESS OÜ | 17167069 |
| RAUDSEPA BESS OÜ (former name Evecon Tsirguliina 2 OÜ) | 16104960 |
| ZIRGU BESS OÜ | 17402145 |
| VKG BESS OÜ | 17446390 |
| AMPERE BESS 1 OÜ | 17343141 |
| COIN BESS OÜ | 17373099 |
| TSIRGULIINA BESS HOLDINGS OÜ | 17417031 |
| NORDIC BESS DEVELOPMENT OÜ | 17423466 |
| RAUDSEPA BESS RIGHTS OÜ (former name Evecon Kopli OÜ) | 16104888 |
| KANEPI ENERGIA BESS OÜ | 17128916 |
| BESSIFY OÜ | 12266097 |
| HARTVIK WORLD INVESTMENTS OÜ kustutatud (former name Bess Investments OÜ) | 12335384 |
| MESSI OÜ | 16826618 |
| FESSI OÜ | 16522485 |
| SESSI OÜ | 14402529 |
| ESSI OÜ | 12528195 |
| BUSSI EKSPERT OÜ | 12931034 |
| BUSSI MAGNET OÜ kustutatud | 12596417 |
| ESSI AGRO OÜ | 12090445 |
| ESSI TALU OÜ | 11310459 |