SOSV is a Princeton, New Jersey-based global multi-stage venture capital firm founded in 1995 by Sean O'Sullivan, specializing in deep tech startups focused on **human and planetary health**, particularly through its renowned accelerator-style programs HAX (hard tech, based in Newark and Tokyo) and IndieBio (life sciences/biotech, in New York City and San Francisco). With approximately **$1.5 billion** in assets under management as of 2025, SOSV is one of the most active deep tech investors worldwide, providing pre-seed "first checks" (typically up to $550k), intensive hands-on support via labs and engineering facilities, and follow-on investments through seed, Series A, and beyond. The portfolio exceeds 1,000 companies with standout successes including unicorns like Upside Foods (cultivated meat), NotCo (plant-based foods), Opentrons (lab automation), Formlabs (3D printing), and MycoWorks (mushroom leather), alongside numerous exits, high-impact climate plays (e.g., Unspun, Prolific Machines), and health innovations, consistently ranking as a top investor in climate tech and health.