Companies, O
OO'Reilly AutomotiveRetail and consumer conglomerates · United States·Hard to displaceOO.C. TannerJob boards and HR platforms · United States·Defensible for nowOo11YC Winter 2026 · United States·Losing its protectionOo9 SolutionsLogistics and supply chain companies · United States·Protection under testOOAGFinancial data and information services · United Kingdom·Hard to displaceOOak Street HealthMedical technology and health companies · United States·Protection under testOOakNorthPayments companies · United Kingdom·Hard to displaceOOakNorth BankUnited Kingdom · United Kingdom·Hard to displaceOOatly GroupFood tech and alternative protein · Sweden·Losing its protectionOObayashi CorporationReal estate developers · Japan·Hard to displaceOOberoi Group (EIH Limited)Rail and transport infrastructure · India·Defensible for nowOOberoi RealtyReal estate developers · India·Hard to displaceOOBICAccounting, tax and business software · Japan·Hard to displaceOObieInsurance technology companies · United States·Losing its protectionOObjectivityIT services and system integrators · United Kingdom·Protection under testOObserve Inc.Telecom operators · United States·Defensible for nowOObserve.AIAI companies and labs · United States·Losing its protectionOObsidianEnterprise and productivity software · United States·Hard to displaceOObsidian EntertainmentGaming companies · United States·Losing its protectionOOcado GroupLogistics and supply chain companies · United Kingdom·Losing its protectionOOcado Group plcConsumer platforms · United Kingdom·Losing its protectionOOCBC BankInsurance companies · Singapore·Hard to displaceOOccidental PetroleumManufacturing companies · United States·Hard to displaceOOcean Network Express (ONE)Logistics and supply chain companies · Japan·Defensible for nowOOceanBaseData and analytics companies · China·Protection under testOOceandriver Inc.Greece·Little protection leftOOceanLight Acquisition CorporationUnited States·Little protection leftOOCS GroupStaffing and recruitment firms · United Kingdom·Losing its protectionOOCSiAlLuxembourg·Protection under testOOctamileInsurance technology companies · Unknown·Little protection leftOOctaPulseYC Winter 2026 · United States·Losing its protectionOOctopus DeployCloud and infrastructure providers · Australia·Defensible for nowOOctopus HoldingsPayments companies · Hong Kong·Hard to displaceOOdakyu Electric RailwayRail and transport infrastructure · Japan·Hard to displaceOOddleVertical and industry software · Singapore·Losing its protectionOOddpoolYC Spring 2026 · United States·Losing its protectionOOdigoBPO and customer operations firms · Israel·Losing its protectionOOdooEnterprise and productivity software · Belgium·Hard to displaceOOdysseyUnited States · United States·Losing its protectionOOdyssey Logistics & TechnologyLogistics and supply chain companies · United States·Protection under testOOfBusinessIndia · India·Hard to displaceOOffchain LabsCrypto and digital asset companies · United States·Losing its protectionOOffcn Education Technology Co., Ltd.Universities and education institutions · China·Protection under testOOfferpad SolutionsVertical and industry software · United States·Little protection leftOOfferUpE-commerce and marketplaces · United States·Little protection leftOOfficevibeJob boards and HR platforms · Canada·Losing its protectionOOFXPayments companies · Australia·Losing its protectionOOHB SESpace, defense and state enterprises · Germany·Defensible for nowOOhmyhomeVertical and industry software · Singapore·Little protection leftOOil and Natural Gas Corporation (ONGC)Oil and gas companies · India·Hard to displaceOOKCoinCrypto and digital asset companies · United States·Protection under testOOklo IncIndustrial materials and energy · United States·Losing its protectionOOktaCloud and infrastructure providers · United States·Hard to displaceOOkuma CorporationRobotics and industrial automation · Japan·Hard to displaceOOKXPayments companies · Cayman Islands·Protection under testOOlam GroupFood tech and alternative protein · Singapore·Protection under testOOlam LabsYC Summer 2026 · United States·Protection under testOOlaplex HoldingsConsumer brands · United States·Losing its protectionOOlarkBPO and customer operations firms · United States·Little protection leftOOld Dominion Freight LineLogistics and supply chain companies · United States·Hard to displaceOOld Republic InternationalInsurance companies · United States·Hard to displaceOOligo SecurityCybersecurity companies · United States·Losing its protectionOOlipopRetail and consumer conglomerates · United States·Losing its protectionOOlistBrazil·Losing its protectionOOliver WymanAdvertising and professional services · United States·Protection under testOOloVertical and industry software · United States·Losing its protectionOOLX GroupE-commerce and marketplaces · Netherlands·Hard to displaceOOlympus CorporationMedical technology and health companies · Japan·Defensible for nowOOlympus CorporationBiotech tools companies · Japan·Protection under testOOmada HealthMedical technology and health companies · United States·Losing its protectionOOmdiaFinancial data and information services · United Kingdom·Losing its protectionOOmioGermany · Germany·Losing its protectionOOmniUnited States · United States·Losing its protectionOOmnichatBPO and customer operations firms · Hong Kong·Losing its protectionOOmnicom GroupBroadcast and traditional media · United States·Losing its protectionOOmnipresentJob boards and HR platforms · United Kingdom·Little protection leftOOmnitracsLogistics and supply chain companies · United States·Losing its protectionOOmron CorporationManufacturing companies · Japan·Defensible for nowOOn Holding AGConsumer brands · Switzerland·Defensible for nowOON1Design and creative software · United States·Losing its protectionOOnclusiveFinancial data and information services · United Kingdom·Losing its protectionOOndatoAccounting, tax and business software · France·Protection under testOOndo FinanceCrypto and digital asset companies · United States·Losing its protectionOONESingapore · Singapore·Losing its protectionOOne IdentityCybersecurity companies · United States·Losing its protectionOOne MedicalMedical technology and health companies · United States·Losing its protectionOOne RobotYC Winter 2026 · United States·Losing its protectionOOne Universe Acquisition CorporationHong Kong·Little protection leftOOnebriefUnited States · United States·Defensible for nowOOneCLIYC Summer 2026 · United States·Losing its protectionOOneConnect Financial TechnologyPayments companies · China·Little protection leftOOneDegreeInsurance technology companies · Hong Kong·Defensible for nowOOneKeyCrypto and digital asset companies · Singapore·Losing its protectionOOneMain FinancialBanks and financial groups · United States·Defensible for nowOOneokManufacturing companies · United States·Hard to displaceOOneSource VirtualStaffing and recruitment firms · United States·Losing its protectionOOneTrustCybersecurity companies · United States·Protection under testOOnfidoPayments companies · United Kingdom·Losing its protectionOOnfleetLogistics and supply chain companies · United States·Losing its protectionOOnitAccounting, tax and business software · United States·Losing its protectionOOnlyFansConsumer platforms · United Kingdom·Defensible for nowOONLYOFFICEEnterprise and productivity software · Russia·Losing its protectionOOnnaAccounting, tax and business software · United Kingdom·Protection under testOOno PharmaceuticalPharma and healthcare groups · Japan·Losing its protectionOOnroLogistics and supply chain companies · Unknown·Little protection leftOOnRobotRobotics and industrial automation · Denmark·Little protection leftOonsemi (ON Semiconductor)Semiconductor companies · United States·Losing its protectionOOnsurityInsurance technology companies · India·Losing its protectionOOnto InnovationSemiconductor companies · United States·Defensible for nowOOntologyCrypto and digital asset companies · China·Little protection leftOOntoraYC Spring 2026 · United States·Losing its protectionOOntraAccounting, tax and business software · United Kingdom·Hard to displaceOOnward Holdings Co., Ltd.Consumer brands · Japan·Losing its protectionOOoak DataYC Summer 2026 · France·Losing its protectionOOOCL (Orient Overseas Container Line)Logistics and supply chain companies · Hong Kong·Defensible for nowOOomaBPO and customer operations firms · United States·Losing its protectionOOoredoo GroupTelecom infrastructure · Qatar·Hard to displaceOOP LabsCrypto and digital asset companies · United States·Losing its protectionOOpalite HealthYC Winter 2026 · United States·Losing its protectionOOPayPayments companies · Nigeria·Protection under testOOpenIndia · India·Little protection leftOOpen Access BPOBPO and customer operations firms · Philippines·Little protection leftOOpen CollegesUniversities and education institutions · Australia·Little protection leftOOpen EnglishEducation companies · United States·Losing its protectionOOpen Financial TechnologiesPayments companies · India·Protection under testOOpen House GroupReal estate developers · Japan·Defensible for nowOOpen InfluenceCreator economy and media tech · United States·Protection under testOOpenAIAI companies and labs · United States·Losing its protectionOOpenCartE-commerce and marketplaces · United Kingdom·Protection under testOOpenClassroomsEducation companies · France·Losing its protectionOOpenCounterGovernment and public sector tech · United States·Protection under testOOpendoorConsumer platforms · United States·Losing its protectionOOpenEvidenceAI companies and labs · United States·Defensible for nowOOpenGovGovernment and public sector tech · United States·Defensible for nowOOpenlyInsurance technology companies · United States·Losing its protectionOOpenProseYC Spring 2026 · United States·Losing its protectionOOpenRelayYC Summer 2026 · United States·Little protection leftOOpenRiceVertical and industry software · Hong Kong·Losing its protectionOOpenrollYC Fall 2025 · United States·Little protection leftOOpenRouterUnited States · United States·Losing its protectionOOpenSeaCrypto and digital asset companies · United States·Protection under testOOpenSesameEducation companies · United States·Protection under testOOpenSpaceVertical and industry software · United States·Losing its protectionOOpenSpecYC Winter 2026 · Australia·Losing its protectionOOpenTableVertical and industry software · United States·Protection under testOOpenText CybersecurityCybersecurity companies · Canada·Protection under testOOpenTradeYC Summer 2026 · United States·Little protection leftOOpentronsUnited States · United States·Losing its protectionOOpenWebUnited States · United States·Losing its protectionOOpenWorkYC Spring 2026 · United States·Protection under testOOpenXConsumer internet and adtech companies · United States·Losing its protectionOOpenZeppelinCrypto and digital asset companies · Argentina·Defensible for nowOOperonYC Summer 2026 · United States·Losing its protectionOOPISFinancial data and information services · United States·Hard to displaceOOpnThailand·Losing its protectionOOpn (Omise)Payments companies · Thailand·Losing its protectionOOptibusIsrael · Israel·Defensible for nowOOptimismUnited States · United States·Losing its protectionOOptimizelyCloud and infrastructure providers · United States·Protection under testOOptimum CommunicationsManufacturing companies · Unknown·Little protection leftOOption Therapeutics Inc.United States·Little protection leftOOptivCybersecurity companies · United States·Losing its protectionOOptusTelecom infrastructure · Australia·Defensible for nowOOpus ClipCreator economy and media tech · United States·Losing its protectionOOracleData and analytics companies · United States·Protection under testOOrange BusinessTelecom operators · France·Defensible for nowOOrange S.A.Telecom infrastructure · France·Hard to displaceOOraSure Technologies, Inc.Biotech tools companies · United States·Losing its protectionOOrbexSpace, defense and state enterprises · United Kingdom·Little protection leftOOrcaCrypto and digital asset companies · Unknown·Losing its protectionOOrca BioUnited States · United States·Losing its protectionOOrca SecurityCloud and infrastructure providers · Israel·Losing its protectionOOrCam TechnologiesIsrael · Israel·Little protection leftOOrchardUnited States · United States·Protection under testOOrdinaIT services and system integrators · Netherlands·Losing its protectionOOrdoroLogistics and supply chain companies · United States·Losing its protectionOOrdrCybersecurity companies · United States·Protection under testOOrica LimitedManufacturing companies · Australia·Hard to displaceOOriental Fashion Driving SchoolUniversities and education institutions · China·Little protection leftOOrigami RiskInsurance technology companies · United States·Defensible for nowOOrigami RoboticsYC Winter 2026 · United States·Losing its protectionOOriginYC Winter 2026 · United States·Losing its protectionOOrigin QuantumChina · China·Protection under testOOrion Advisor SolutionsBanks and financial groups · United States·Defensible for nowOOrion CorporationRetail and consumer conglomerates · South Korea·Defensible for nowOOrix CorporationInsurance companies · Japan·Hard to displaceOOrmat TechnologiesIndustrial materials and energy · Israel·Defensible for nowOOrna TherapeuticsUnited States · United States·Losing its protectionOOrnadyneYC Spring 2026 · United States·Losing its protectionOOroCommerceE-commerce and marketplaces · United States·Losing its protectionØØrstedIndustrial materials and energy · Denmark·Losing its protectionOORTECLogistics and supply chain companies · Netherlands·Protection under testOOrthogonalYC Winter 2026 · United States·Losing its protectionOOrvixoYC Summer 2026 · United Kingdom·Losing its protectionOOS3YC Summer 2026 · United States·Losing its protectionOOsanoCybersecurity companies · United States·Losing its protectionOOsaroRobotics and industrial automation · United States·Protection under testOOscar HealthInsurance companies · United States·Losing its protectionOOshkoshManufacturing companies · United States·Defensible for nowOOshkosh DefenseSpace, defense and state enterprises · United States·Defensible for nowOOSIM InternationalRetail and consumer conglomerates · Singapore·Losing its protectionOOSL GroupPayments companies · Hong Kong·Losing its protectionOOsmauraYC Summer 2026 · United States·Losing its protectionOOsmoUnited States·Losing its protectionOOsmosis LabsCrypto and digital asset companies · Unknown·Little protection leftOOsomeAccounting, tax and business software · Singapore·Losing its protectionOOsseusYC Summer 2026 · United States·Losing its protectionOOssusYC Winter 2026 · United States·Losing its protectionOOtis WorldwideManufacturing companies · United States·Hard to displaceOOtokarSpace, defense and state enterprises · Turkey·Hard to displaceOOTOYDesign and creative software · United States·Losing its protectionOOtsuka CorporationIT services and system integrators · Japan·Hard to displaceOOtsuka PharmaceuticalPharma and healthcare groups · Japan·Hard to displaceOOttaJob boards and HR platforms · United Kingdom·Little protection leftOOtterVertical and industry software · Unknown·Losing its protectionOOtter.aiAI companies and labs · United States·Losing its protectionOOtto Bock HealthCareGermany · Germany·Defensible for nowOOtto GroupE-commerce and marketplaces · Germany·Losing its protectionOOTTO MotorsLogistics and supply chain companies · India·Hard to displaceOOttonovaInsurance technology companies · Germany·Protection under testOOuai HaircareConsumer brands · United States·Losing its protectionOOur Next EnergyUnited States · United States·Protection under testOOuraMedical technology and health companies · Finland·Defensible for nowOOurpalm Co.Gaming companies · China·Losing its protectionOOuster Inc.Automotive companies · United States·Protection under testOOutbrainConsumer internet and adtech companies · Israel·Losing its protectionOOutdoor VoicesConsumer brands · United States·Little protection leftOOutfit7Gaming companies · Cyprus·Protection under testOOutlier.orgUniversities and education institutions · United States·Losing its protectionOOutreachConsumer internet and adtech companies · United States·Losing its protectionOOutriderRobotics and industrial automation · United States·Losing its protectionOOutschoolEducation companies · United States·Losing its protectionOOutsourcing Inc.Staffing and recruitment firms · Japan·Losing its protectionOOutSystemsPortugal·Losing its protectionOOuyeelChina · China·Protection under testOOverdrive HealthYC Winter 2026 · United States·Losing its protectionOOverhaulLogistics and supply chain companies · United States·Protection under testOOvershootYC Winter 2026 · United States·Protection under testOOverstock (Bed Bath & Beyond Inc.)E-commerce and marketplaces · United States·Little protection leftOOVHFrance · France·Losing its protectionOOVHcloudTelecom operators · France·Defensible for nowOOvintivManufacturing companies · Canada·Protection under testOOVOPayments companies · Indonesia·Losing its protectionOOVO EnergyUnited Kingdom · United Kingdom·Little protection leftOOwens CorningManufacturing companies · United States·Hard to displaceOOwkinAI companies and labs · France·Protection under testOOwlcat GamesGaming companies · Russia·Hard to displaceOOwlerFinancial data and information services · United States·Protection under testOownCloudEnterprise and productivity software · Germany·Losing its protectionOOwnerUnited States · United States·Losing its protectionOOxford EconomicsFinancial data and information services · United Kingdom·Defensible for nowOOxford Nanopore TechnologiesBiotech tools companies · United Kingdom·Losing its protectionOOximyYC Winter 2026 · United States·Losing its protectionOOxusYC Winter 2026 · United States·Losing its protectionOOYO RoomsConsumer platforms · India·Losing its protectionOOysterUnited States · United States·Losing its protectionOOyster HRJob boards and HR platforms · France·Losing its protectionOOzonE-commerce and marketplaces · Russia·Protection under testOOzonetel CommunicationsBPO and customer operations firms · India·Losing its protection