Location
United States, North America
Check Size
$100K - $5M
Investment Stage
Seed
Series A
Focus Areas
Marketplaces
BioTech
ClimateTech/CleanTech
Hardware
About Investor
Sean O'Sullivan is the Managing Partner at SOSV in New York City, investing $100K–$5M (sweet spot $1.5M) primarily in hardware, climate tech, and biotech at pre-seed through Series C; his latest significant investment was in Prellis Biologics’ Series C round in March 2025. Sean manages a $1.2B fund and actively supports startups through accelerators including IndieBio and HAX.
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