Old Line Capital Partners
Bowie, Maryland pre-seed/seed VC providing hands-on mentoring and small-business expertise to founders across Maryland and the Mid-Atlantic.
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.
OMERS Ventures
Backed by Canada's OMERS pension fund, invests in early-stage fintech, vertical software, and AI infrastructure founders.
Oncology Ventures
Backing founders and companies building the future of cancer care
One Peak
Growth equity firm with $4B+ AUM investing $15M–$150M in European software scale-ups with $5M+ ARR, backing category-defining SaaS companies from growth through IPO or exit.
One Planet Capital
Venture capital for climate change
OneSixOne Ventures
Pre-seed VC for enterprise software and govtech startups
ONEVC
Seed-stage VC backing Latin American founders, run by former operators who help recruit talent and build people strategy.
Open Opportunity Fund
B2B software VC backing Black and Latino founders across the US
OpenOcean
Pan-European early-stage VC backing technical B2B software founders at Seed and Series A, with roots in building MySQL and MariaDB.
OpenSeed VC
Solo GP pre-seed fund writing up to $150K checks into exceptional operators and domain experts starting tech companies across Europe and Africa in enterprise, health, and future of work.
Operator Collective
Venture fund and community of operators backing enterprise and B2B founders
Operator Partners
Self-funded operator collective investing own capital in technology companies from pre-seed through Series B, never leading rounds or taking board seats.
Operators Studio
Micro-VC run by solo GP Soumitra Sharma backing "Global Indian" tech founders in the US-India corridor with $50–100k pre-seed and seed checks.
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.
Orange Collective
AI-native YC alumni fund backing breakout YC founders building in AI infrastructure, applied AI, agentic tools, and vertical software at seed stage.
Oraseya Capital
Dubai government-backed VC fund of DIEZ investing pre-seed to Series B in UAE-tied tech startups, most active investor in the UAE.
Orbit Capital
Prague-based investor pioneering venture debt in CEE, pairing non-dilutive growth debt with growth equity for post-Series A tech scaleups.
Oregon Venture Fund
Regional VC providing capital and support to Oregon/SW Washington startups and growth companies
Original Capital
Early-stage fund that skips board seats to stay founder-aligned, backing technically deep, relentless founders in vertical software and fintech.
Osage Venture Partners
Investing in early-stage B2B software start-ups for over two decades
Osney Capital
UK-only sector specialist VC investing exclusively in early-stage cybersecurity startups. First specialist cyber seed fund in the UK.
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