Oak HC/FT
Venture and growth equity firm backing healthcare and fintech companies from seed through growth stage, with $5.3B AUM.
Obvious Ventures
Venture capital for startups reimagining trillion-dollar industries through a world positive lens
Offscript
Generalist seed fund backing founders with unconventional life narratives, betting that being "written off" is often a sign of exceptional character.
Ohio Innovation Fund
Early-stage VC based in Dublin, Ohio investing $500K–$4M in disruptive founders across AI/ML, cybersecurity, medtech, AR/VR, SaaS, and biotech with a team track record of 7 unicorns.
Okapi Venture Capital
Named for the "dense jungle"-adapted animal, this seed and early-stage fund has backed information technology and life science startups since 2005.
Olive Technology Ventures
Multi-family-office-backed venture platform with ~$1B AUM, led by ex-WestSummit/Vertex Ventures partner Elise Huang; exits include Unity, UiPath.
Olive Tree Capital
Boston-based family office-rooted VC investing in technology, life sciences, fintech, and frontier startups globally across early and growth stages.
Omega Funds
Investing in the future of medicine through life sciences
OMERS Ventures
Backed by Canada's OMERS pension fund, invests in early-stage fintech, vertical software, and AI infrastructure founders.
OMX Ventures
Lincolnshire-based early-stage VC investing at the convergence of biology, big data, and AI, backing therapeutics, bio-tools, diagnostics, and synthetic biology companies across North America and Europe.
Oncology Ventures
Backing founders and companies building the future of cancer care
Ondine Capital
Southeast Asia-focused VC backing consumer tech startups in retail, education, logistics, and broader TMT sectors.
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Venture capital for climate change
ONEVC
Seed-stage VC backing Latin American founders, run by former operators who help recruit talent and build people strategy.
Onigiri Capital
Asia-focused VC launched by Saison Capital, investing in blockchain startups building stablecoins, tokenization, and institutional DeFi.
Ono Venture Investment
Corporate VC arm of Ono Pharma investing in early-stage oncology, immunology, and neurology startups synergistic with pharma R&D.
Onsight Ventures
Spun off from Hermann Hauser's family office, this Innsbruck fund backs early-stage European deep tech across quantum, semiconductors, and biotech.
Open Opportunity Fund
B2B software VC backing Black and Latino founders across the US
Operator Collective
Venture fund and community of operators backing enterprise and B2B founders
Optimist Ventures
New York-based multi-stage VC backing founders in AI, InsurTech, Fintech, and industrial automation across early and late stage.
Optum Ventures
Investing in extraordinary entrepreneurs to transform healthcare
Ora Global
Spun out of Exor's century-old conglomerate in 2024, backs resilience-focused founders in AI infrastructure, security and automation.
OrbiMed
Global leader investing in healthcare from early-stage to public companies
Origin Ventures
Early-stage VC leading seed and Series A rounds for 25+ years, now focused on AI infrastructure, AI-native software, and frontier tech.
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