| Company name | Reg. code |
|---|---|
| ORRO OÜ | 11377989 |
| ORRO EHITUS OÜ | 16678141 |
| ORRO ELEKTER OÜ | 10512284 |
| ORROX OÜ | 14708317 |
| ORR PRODUCTIONS OÜ | 14672097 |
| ORR HOLDINGS OÜ | 17408432 |
| ORROIL OÜ | 14021617 |
| ORROKIVI OÜ | 11102420 |
| OSRO OÜ | 16156299 |
| RORO OÜ kustutatud | 16428102 |
| PORRO OÜ kustutatud | 12994394 |
| MORRO OÜ (former name Palanca Labs OÜ) | 14935013 |
| ORGO OÜ | 14246408 |
| OJRO OÜ kustutatud | 14842317 |
| RORO OÜ kustutatud | 11329246 |
| ORNO OÜ | 14031412 |
| ORO OÜ | 14159460 |
| RORO INVESTEERINGUD OÜ | 14810346 |
| NOVUS ORDO OÜ | 12718636 |
| ARRO ACCOUNTING OÜ | 12268357 |
| ARRO PROJEKT OÜ | 11013477 |
| ZORRO TRADE OÜ kustutatud | 12136041 |
| ARRO PRODUCTION OÜ | 17384418 |
| ARRO TALU OÜ | 12623077 |
| ARRO ATELIER OÜ kustutatud | 14045704 |
| RORO FOODS OÜ | 16295836 |
| ARRO EHITUS OÜ kustutatud | 12869306 |
| ARRO ATELJEE OÜ (former name Puffberry OÜ) | 11765964 |
| ERRO KOOLITUSED OÜ | 12487600 |
| RORO MÖÖBEL OÜ | 14595511 |
| RORO COMPANY OÜ | 14947358 |
| ARRO TEENUS OÜ | 14423193 |
| JH-OTRO OÜ | 14846924 |
| ORTO KINNISVARA OÜ | 10617302 |
| ARRO HOLDING OÜ (former name Arro Santech Solutions OÜ) | 14188361 |
| ARRO&FURNITURE OÜ | 17063772 |
| OIRO TRANS OÜ | 12398522 |
| ORSO POLARE OÜ | 16763036 |
| OERO INTERNATIONAL OÜ | 14696241 |
| RORO MUSIC OÜ | 12673164 |
| HANNES ARRO OÜ | 11116326 |
| ORNO GRUPP OÜ kustutatud | 14043556 |
| JM KORRO OÜ | 11060488 |
| TALLUX ORTO OÜ | 12600478 |
| UNISTUSE ORTO OÜ | 17010830 |
| ORTO TEENUS OÜ | 14883026 |
| OIRO EHITUS OÜ | 11341738 |
| ANTI-CORRO OÜ | 10553361 |
| TORRO CAPITALS OÜ kustutatud | 12292410 |
| ST ORTO OÜ | 17114239 |