| Company name | Reg. code |
|---|---|
| AQUARO OÜ | 16892561 |
| AQUAROL OÜ | 10651419 |
| AQUAPRO OÜ kustutatud | 12677067 |
| AQUARE OÜ | 14785938 |
| AQUAPRO TROPIC OÜ | 10377591 |
| AQUARE PROJEKT OÜ (former name Bravaris OÜ) | 12538058 |
| AQUATOR OÜ | 10008474 |
| AQUAPROF OÜ (former name The Invest Ehitus OÜ) | 11387781 |
| AQUILO HOLDING OÜ | 11912566 |
| SAGUARO OÜ | 14585665 |
| ASQUARE OÜ | 16505334 |
| SQUARE24 OÜ kustutatud | 16206353 |
| ANQURO OÜ | 12976893 |
| ACQUIRO OÜ | 10988550 |
| ANMARO OÜ | 14183607 |
| AIKARO OÜ kustutatud | 14281112 |
| ARTARO OÜ | 10145337 |
| 50 SQUARE OÜ | 12629499 |
| ALCARO OÜ | 12382876 |
| AMMARO OÜ | 16856884 |
| ACUARIO OÜ kustutatud | 12534020 |
| ALBARO OÜ (former name Aktsiaselts Albaro Holding) | 10744479 |
| ARVARO OÜ | 17146570 |
| AIMARO OÜ kustutatud | 11248200 |
| ALFARO OÜ kustutatud | 14022956 |
| SQUARE11 OÜ | 16983217 |
| AGARO OÜ | 16312345 |
| AKARO OÜ | 11998154 |
| QUATRO RENT OÜ | 16895335 |
| QUARTO GROUP OÜ | 14662638 |
| QUATRO WORKS OÜ kustutatud (former name Quatro Works UÜ) | 12921538 |
| QUADRO CENTER OÜ kustutatud | 12833159 |
| SQUARE ONE OÜ | 14035002 |
| GRAY SQUARE OÜ kustutatud | 12844594 |
| ARTARO AN OÜ | 17359389 |
| RETREAT SQUARE OÜ | 16880581 |
| SQUARE MOUNTAINS OÜ | 12543987 |
| QUARTO DIGITAL OÜ kustutatud | 14560961 |
| SQUARE KEBAB OÜ kustutatud | 12073984 |
| QUATRO FOOD OÜ kustutatud | 10889606 |
| QUATRO SOLUTIONS OÜ kustutatud | 16963574 |
| SQUARE SAUNAHAUS OÜ | 10655044 |
| ANKARO ARENDUS OÜ kustutatud | 11102991 |
| SQUARE HOLDING OÜ | 14945690 |
| FREEDOM SQUARE OÜ kustutatud | 16120479 |
| ASQUARE BALTICS OÜ | 14138015 |
| AUTO QUATRO OÜ | 11272670 |
| ANDARO TRADE OÜ | 14611925 |
| SQUARE INTERNATIONAL OÜ kustutatud | 14674245 |
| VINTAGE SQUARE OÜ | 16830399 |