- OTP BankPublic$32B
- OtriumPrivate$900M
- OtsukaPublic$8.6B
- Otsuka Information TechnologyPublic$80M
- Ottawa Senators Hockey ClubPrivate$950M
- Otto HoldingPublic$15M
- OttobockPublic$3.4B
- ottonovaPrivate$114M
- Oui CarePrivate-
- Our Next EnergyPrivate$1.2B
- OuraPrivate$11B
- Ouro MedicinesPrivate$2.2B
- OurofinoPublic$246M
- OurpalmPublic$2B
- OusterPublic$2.5B
- OutbrainPrivate$921M
- Outcome HealthPrivate$5.5B
- Outdoor HoldingPublic$267M
- OutdoorsyPrivate$1.8B
- OutdoorzyPublic$13M
- Outfront MediaPublic$5.4B
- Outlet Group HoldingPublic$477M
- OutokumpuPublic$2B
- Outpace BioPrivate-
- OutreachPrivate$4.4B
- OutriderPrivate-
- OutschoolPrivate$3B
- Outset MedicalPublic$80M
- OutsidePrivate$47M
- OUTsurance GroupPublic$8.5B
- OutSystemsPrivate$4.3B
- OuyeelPrivate$1.5B
- Ouyeel Industrial ProductsPrivate-
- Ovaro KiinteistosijoitusPublic$25M
- OVB HoldingPublic$302M
- OverairPrivate$83M
- OverhaulPrivate$75M
- OverjetPrivate$712M
- Overland AIPrivate-
- Overseas CommercePublic$89M
- OvertimePrivate$500M
- Overwatch ResearchPrivate-
- OVHcloudPublic$2.4B
- Ovid TherapeuticsPublic$557M
- OvintivPublic$16B
- OvivaPrivate$769M
- OVO EnergyPrivate$1.3B
- OVSPublic$1.6B
- OvzonPublic$416M
- Owens-CorningPublic$9.4B
- OwkinPrivate$1B
- OwletPublic$122M
- Owlstone MedicalPrivate-
- Own CompanyPrivate$1.9B
- OwndaysPrivate$784M
- OwnerPrivate$2.3B
- OX2Private$1.5B
- OxaPrivate-
- OXE MarinePublic$16M
- Oxford BioMedicaPublic$891M
- Oxford IndustriesPublic$440M
- Oxford InstrumentsPublic$1.8B
- Oxford IonicsPrivate$1.1B
- Oxford MetricsPublic$54M
- Oxford Nanopore TechnologiesPublic$2.7B
- Oxford PVPrivate$195M
- Oxford Quantum CircuitsPrivate-
- Oxford Square CapitalPublic$106M
- Oxide Computer CompanyPrivate-
- OxiquimPublic$412M
- Oxygen MediaPrivate-
- OxylabsPrivate$3.6B
- OxyzoPrivate$1B
- Oyak ÇimentoPublic$1.9B
- Oyak YatırımPublic$139M
- OYAK Yatırım OrtaklığıPublic$12M
- OyikaPrivate$63M
- Oylum Sinai YatirimlarPublic$14M
- OYOPrivate$3.8B
- OysterPrivate$1.2B
- Ozak GYOPublic$349M
- Özderici GYOPublic$29M
- OzonPrivate$815M
- Özsu BalıkPublic$87M
- Özyaşar TelPublic$109M




