| Company name | Reg. code |
|---|---|
| BOOK IN OÜ (former name Medius OÜ) | 12135521 |
| BOOK HOUSE INTERIORS OÜ | 12636068 |
| BIP TRAVEL OÜ kustutatud (former name Bookandtrip International OÜ) | 14309155 |
| TTN BUSINESS TRAVEL MANAGEMENT INTERNATIONAL OÜ (former name Bookandtrip International OÜ) | 14087743 |
| BOOKSWAP INTERNATIONAL OÜ (former name OÜ Raamatuvahetus) | 14027103 |
| WISE INTERNATIONAL BOOKING OÜ | 16557868 |