Pre-seed & seed VC, US

SOSV

Venture capital firm · Princeton · Founded 1995

Quick read

SOSV is a pre-seed and multi-stage deep tech VC, founded in 1995 and headquartered in Princeton, NJ. It's the world's most active deep tech pre-seed firm, deploying capital through accelerator programs HAX (hardware), IndieBio (life sciences), and the recently independent Orbit Startups. As of 2026, SOSV manages $1.5B in AUM across a portfolio of 800 active companies valued at $18.2B.

Key facts

Founded
1995
Founders
Sean O'Sullivan
Employees
68
Sectors
hardware, biotech, climate, ai, healthcare
Website
sosv.com

Investment thesis

SOSV backs deep tech founders at pre-seed, writing first checks into life sciences, hardware, and climate companies through its accelerator programs (HAX for hardware, IndieBio for life sciences). The firm then follows on through seed and later rounds, aiming to build companies with measurable impact on human and planetary health.

Recent activity

  • Apr 2026investment
    SOSV participated in Fermeate's $2M seed round for optogenetics-based fermentation control. tracxn.com
  • Mar 2026investment
    SOSV joined a $6M seed extension round in Surf Therapeutics. startupintros.com
  • Jan 2026press
    Portfolio company Particle was acquired by Digi International. tracxn.com
  • Jan 2026press
    SOSV published its 2026 portfolio snapshot: 800 active companies had raised $7.3B and were valued at $18.2B, anchored by its $306M SOSV V fund. sosv.com
  • 2025leadership
    Sean O'Sullivan announced IndieBio's evolution within SOSV, rebranding the SF and NY programs under unified SOSV branding with Po Bronson leading as General Partner. linkedin.com
  • 2025investment
    SOSV co-invested in Logos Research, an Imperial College London spinout building AI code reliability tools, alongside Khosla Ventures and XTX Ventures. linkedin.com
  • 2025investment
    SOSV co-invested in unspun, a carbon-reduction apparel company that closed $57M with DCVC and Lowercarbon Capital. sosv.com
  • 2025press
    Po Bronson, General Partner, published SOSV's climate hard tech trend outlook for 2026. linkedin.com

Notable investments

Key people

Named individuals at the firm. We don't expose direct email or phone — use their LinkedIn for outreach.

  • Sean O'Sullivan · Founder & Managing Director
    LinkedIn
  • Po Bronson · General Partner (SF & NY)
    LinkedIn
  • Parikshit Sharma · Partner, IndieBio
    LinkedIn

Sources

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Frequently asked

What is SOSV?+

SOSV is a pre-seed and multi-stage deep tech VC, founded in 1995 and headquartered in Princeton, NJ. It's the world's most active deep tech pre-seed firm, deploying capital through accelerator programs HAX (hardware), IndieBio (life sciences), and the recently independent Orbit Startups.

Where is SOSV headquartered?+

SOSV is headquartered in Princeton, United States.

When was SOSV founded?+

SOSV was founded in 1995 by Sean O'Sullivan.

What sectors does SOSV invest in?+

SOSV focuses on hardware, biotech, climate, ai, healthcare. They primarily invest in these sectors.

How do I prepare for a meeting with SOSV?+

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Generated by briefthecall.com from public web sources. Last updated June 5, 2026. Each claim is linked to its source above.

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