| Company name | Reg. code |
|---|---|
| FIRSTZONE OÜ | 16345480 |
| FIRSTONE OÜ kustutatud (former name FirstOne UÜ) | 12982824 |
| FIRSTLINE OÜ (former name Worldcom OÜ) | 17393742 |
| FIRSTNONCE OÜ kustutatud (former name SYNCHRONIUM OÜ) | 14923501 |
| FIRSTON OÜ kustutatud | 11498351 |
| FIRSTMORE BUILDING OÜ | 12331943 |
| VERTE KINNISVARA OÜ (former name Firsthome OÜ) | 14762759 |
| INTERSTAFF OÜ (former name Goodfellas OÜ) | 14503124 |