- OutschoolPrivate$3B
- Outset MedicalPublic$58M
- OutsidePrivate$47M
- OUTsurance GroupPublic$8.2B
- OutSystemsPrivate$4.3B
- OuyeelPrivate$1.5B
- Ouyeel Industrial ProductsPrivate-
- Ovaro KiinteistosijoitusPublic$26M
- OVB HoldingPublic$307M
- OverairPrivate$83M
- OverhaulPrivate$75M
- OverjetPrivate$712M
- Overland AIPrivate-
- OvertimePrivate$500M
- Overwatch ResearchPrivate$585M
- OVHcloudPublic$3.1B
- Ovid TherapeuticsPublic$504M
- OvintivPublic$17B
- OvivaPrivate-
- OVO EnergyPrivate$1.3B
- OVSPublic$1.6B
- OvzonPublic$423M
- Owens-CorningPublic$9.7B
- OwkinPrivate$1B
- OwletPublic$152M
- Owlstone MedicalPrivate-
- Own CompanyPrivate$1.9B
- OwnerPrivate$2.3B
- OX2Private$1.5B
- OxaPrivate-
- OXE MarinePublic$19M
- Oxford BioMedicaPublic$796M
- Oxford IndustriesPublic$395M
- Oxford InstrumentsPublic$2.1B
- Oxford IonicsPrivate$1.1B
- Oxford MetricsPublic$55M
- Oxford Nanopore TechnologiesPublic$2.3B
- Oxford PVPrivate-
- Oxford Quantum CircuitsPrivate-
- Oxide Computer CompanyPrivate-
- OxiquimPublic$327M
- OxylabsPrivate$3.6B
- OxyzoPrivate$1B
- Oyak ÇimentoPublic$2.1B
- Oyak YatırımPublic$190M
- OYAK Yatırım OrtaklığıPublic$16M
- OyikaPrivate$63M
- Oylum Sinai YatirimlarPublic$14M
- OYOPrivate$3.8B
- OysterPrivate$1.2B
- Ozak GYOPublic$367M
- Özderici GYOPublic$35M
- OzonPrivate$815M
- Özsu BalıkPublic$96M
- Özyaşar TelPublic$101M




