Series A Venture Capital Firms

Browse 1,573 venture capital firms that actively invest at the Series A stage. Every firm is verified — explore their thesis, check size, and portfolio, then get matched with the best-fit investors for your startup.

Verified Series A VC firms

OKG Capital

Early-stage medtech and life sciences investor focusing on chronic disease therapeutics and diagnostics, including molecular diagnostics and advanced imaging, in Europe and the US.

  • Other
  • Developer Tools
  • Consumer
  • Seed, Series A
  • 5 portfolio companies

OMERS Ventures

OMERS Ventures backs transformative marketplace and SaaS platforms disrupting traditional consumer and business workflows.

  • Marketplace
  • SaaS
  • Other
  • Seed, Series A
  • $1.0M – $5.0M
  • Toronto, Canada
  • 2 portfolio companies

OSF Ventures

Seed-stage digital health specialist focused on care delivery innovation and digital health infrastructure.

  • Healthcare
  • AI / ML
  • EdTech
  • Seed, Series A
  • $250K – $1.5M
  • Chicago, IL
  • 35 portfolio companies

OUP (Osage University Partners)

Invests in early-stage companies commercializing university-based or deep science innovations in biotech, medtech, and healthtech.

  • Healthcare
  • Other
  • Seed, Pre-Seed, Series A
  • $250K – $2.0M
  • Bala Cynwyd, PA
  • 2 portfolio companies

Oasis Capital Partners

Invest in early-stage Fintech and e-commerce platforms addressing underserved customer segments in global markets.

  • Fintech
  • Other
  • Seed, Series A
  • $500K – $4.0M
  • London, UK
  • 2 portfolio companies

Obvious Ventures

Obvious Ventures invests thematically across three pillars—planetary health, human health, and economic health—backing exceptional founders building breakthrough, world-positive companies that transfo...

  • Consumer
  • Healthcare
  • Climate / Energy
  • Seed, Series A
  • $5.0M – $12.0M
  • San Francisco, United States
  • 10 portfolio companies

Ocean Freight Ventures

Investing in innovative logistics and supply chain technologies with global potential, focused on Latin America and underrepresented markets.

  • Other
  • SaaS
  • Seed, Series A
  • $1.0M – $3.0M
  • Santiago, Chile
  • 1 portfolio company

Oceanic Bridge Capital

Invests in African fintech and platforms facilitating cross-border commerce and payments, with a preference for startups unlocking trade between Africa and global markets.

  • Fintech
  • Other
  • Seed, Series A
  • $100K – $750K
  • Lagos, Nigeria
  • 1 portfolio company

Octopus Ventures

UK-based fund investing in European startups transforming consumer and retail sectors, with emphasis on digital-first businesses.

  • Consumer
  • Other
  • Pre-Seed, Seed, Series A
  • $250K – $1.0M
  • London, UK
  • 159 portfolio companies

Omega Funds

Omega Funds focuses on transformative advances across the life sciences, backing innovators in drug discovery and biotech tools.

  • Other
  • Healthcare
  • Pre-Seed, Seed, Series A
  • $250K – $2.0M
  • Boston, MA
  • 2 portfolio companies

Omegagen Ventures

Invests in cutting-edge biotech innovations and AI applications revolutionizing healthcare delivery.

  • Healthcare
  • Other
  • seed+, Series A
  • $2.0M – $8.0M
  • Boston, MA
  • 2 portfolio companies

Omidyar Network India

Focused on scalable consumer tech solutions solving critical challenges for the mass Indian market.

  • Consumer
  • EdTech
  • Other
  • Seed, Series A
  • $500K – $5.0M
  • Mumbai, India
  • 2 portfolio companies

Omnichannel Pioneers

Invests exclusively in next-gen omnichannel commerce startups redefining in-store and ecommerce experiences through personalization and data.

  • Other
  • Seed, Series A
  • $1.0M – $5.0M
  • London, UK
  • 2 portfolio companies

Online Scale Fund

Focuses exclusively on technological advancements in online commerce platforms.

  • Other
  • Seed, Series A
  • $500K – $3.0M
  • New York, NY
  • 1 portfolio company

OpenOcean

OpenOcean backs European-founded, AI-driven companies that use data as a competitive moat, particularly in AI-enabled services and automation, scalable AI computation, and agentic infrastructure and d...

  • Deep Tech
  • SaaS
  • Developer Tools
  • Seed, Pre-Seed, Series A
  • $2.3M – $5.7M
  • Helsinki, Finland
  • 8 portfolio companies

OperatorTech Capital

Investing in transformative SaaS solutions for freight and transportation sectors, driving operational efficiency.

  • SaaS
  • Other
  • Seed, Series A
  • $1.0M – $4.0M
  • Seattle, WA
  • 1 portfolio company

OpsScale Ventures

Specializes in AI-driven operational intelligence solutions targeting B2B startups serving the SMB market.

  • Other
  • Seed, Series A
  • $1.0M – $5.0M
  • Chicago, IL
  • 1 portfolio company

Optify Health Partners

Invests in HealthTech startups delivering measurable improvements in clinical outcomes through software and AI-driven solutions.

  • Healthcare
  • AI / ML
  • Other
  • Series A, Seed
  • $1.5M – $10.0M
  • Palo Alto, CA
  • 4 portfolio companies

Option3 Ventures

Investing in the cybersecurity and critical infrastructure innovation space, focusing on pre-seed startups tackling enterprise-level risks.

  • Security
  • Other
  • Seed, Series A
  • $500K – $2.5M
  • New York, NY
  • 2 portfolio companies

Optum Ventures

Optum Ventures invests from seed through growth in companies at the intersection of healthcare and technology, including value-based care delivery, enterprise software and enabling infrastructure, and...

  • Healthcare
  • AI / ML
  • Seed, Series A
  • $1.5M – $5.0M
  • Boston, Massachusetts, United States
  • 1 portfolio company

Origin Ventures

Focused on early-stage B2B SaaS and marketplace startups in underrepresented hubs including the Midwest.

  • Marketplace
  • SaaS
  • Seed, Series A
  • $500K – $4.0M
  • Chicago, IL, USA
  • 10 portfolio companies

Orion Southeast Asia Investments

Invests in scalable telecommunications and e-commerce platforms with a Southeast Asian focus.

  • Other
  • Series A
  • $75K – $250K
  • Kuala Lumpur, MY
  • 1 portfolio company

OrthoWave Fund

Targets companies with innovative solutions in orthotic devices and prosthetic technology.

  • Other
  • Seed, Series A
  • $750K – $3.5M
  • Seattle, WA
  • 2 portfolio companies

Orthogonal Partners

Focuses on compliant DeFi protocols, blockchain infrastructure, and institutional finance applications.

  • Other
  • Seed, Series A
  • $1.0M – $5.0M
  • San Francisco, CA
  • 1 portfolio company

Showing 1009–1032 of 1573 firms — page 43 of 66.

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