| Ettevõtte nimi | Reg. kood |
|---|---|
| FIRSTIN OÜ | 17171728 |
| FIRSTON OÜ kustutatud | 11498351 |
| FIRSTIT OÜ kustutatud | 11436806 |
| FIRSTLINE OÜ (endine nimi Worldcom OÜ) | 17393742 |
| FIRSTEV OÜ | 16395395 |
| FIRSTUP OÜ | 16870973 |
| FIRSTVPN OÜ | 14626269 |
| FIRSSON OÜ | 16458362 |
| FIRSTLY OÜ kustutatud | 14913514 |
| FIRSTLINE OÜ kustutatud | 10956604 |
| FIRSTONE OÜ kustutatud (endine nimi FirstOne UÜ) | 12982824 |
| FIRSTX OÜ | 16769613 |
| FIRSIM OÜ (endine nimi Altaripoisid OÜ) | 16607299 |
| FIRSTINVEST OÜ (endine nimi Firstinvest UÜ) | 14311034 |
| FIRSTAID INVEST OÜ (endine nimi Trad.Taste OÜ) | 14183441 |
| FIRSTEL GROUP OÜ | 11286293 |
| FIRST OÜ kustutatud | 14896951 |
| FIRTON KUB OÜ kustutatud | 14358716 |
| FIRST PROJECT OÜ | 10944268 |
| FIRST EASYTEC OÜ | 14093784 |
| BALTIC FIRST OÜ | 17183766 |
| NEPTUNE FIRST OÜ | 16183793 |
| FIRST CONSTRUCTION OÜ (endine nimi Realizaria OÜ) | 12879262 |
| FIRST QUANTUM OÜ (endine nimi Gazettiir OÜ) | 16205431 |
| HUMAN FIRST OÜ | 16070669 |
| DATA FIRST OÜ | 16491141 |
| CLIENT FIRST OÜ (endine nimi OÜ MC Erks) | 16746996 |
| FIRST PROMO OÜ (endine nimi POS AJAKIRJAD OÜ) | 12098961 |
| FIRST RING OÜ | 16138485 |
| FIRST4U OÜ | 17391772 |
| FIRST CAPITAL OÜ (endine nimi First Capital UÜ) | 12199165 |
| FIRST STOCK OÜ | 16083092 |
| FUN FIRST OÜ | 12973883 |
| FIRST PHARMA OÜ | 11941125 |
| TECHNOLOGY FIRST OÜ | 17431371 |
| FIRST ACCOUNTING OÜ (endine nimi Aliquanto OÜ) | 12810477 |
| FIRST GUILD OÜ (endine nimi THEGUILD OÜ) | 14913448 |
| PROFIT FIRST OÜ | 16945524 |
| FIRST BUILDER OÜ (endine nimi First Builder UÜ) | 12184330 |
| FIRST DEAL OÜ (endine nimi First Deal UÜ) | 12504154 |
| SAFETY FIRST OÜ | 12759210 |
| BABYS FIRST OÜ | 16593031 |
| FIRST TRANS OÜ | 12608221 |
| CONSULT FIRST OÜ | 14948338 |
| FIRST TRADE OÜ | 12550007 |
| FIRST HERITAGE OÜ | 14611492 |
| ESTLANDER FIRST OÜ (endine nimi Estlander First UÜ) | 14566484 |
| FIRST EVENT OÜ | 12384431 |
| FIRST MOVER OÜ | 17143212 |
| FIRST DRINKS OÜ | 17091538 |