| Company name | Reg. code |
|---|---|
| CHAINLLENGE OÜ | 17052018 |
| CHALLENGE CONSULTING OÜ kustutatud | 16079104 |
| YACHT CHALLENGE OÜ | 14709430 |
| CHALLENGE WAY OÜ (former name SEJAKT OÜ) | 12471905 |
| CHALLENGE ME OÜ kustutatud | 14978608 |
| NORDIC CHALLENGE OÜ | 12754968 |
| THE FRENCH CHALLENGE OÜ | 16997768 |
| E-SPORT CHALLENGE OÜ kustutatud (former name Soleado Systems OÜ) | 14333372 |
| DIRECTIONAL DRILLING CHALLENGE OÜ | 12626868 |
| STELLA FOODS OÜ (former name Challenge Accepted OÜ) | 12973268 |
| GUIDED SAAREMAA OÜ (former name OÜ Overseas challenge) | 11251343 |
| NOVIRA INVESTMENT MANAGEMENT OÜ kustutatud (former name Media Challenge OÜ) | 12876884 |