Sean O'Sullivan

Active Investor

Managing Partner, SOSV at SOSV

New York City, New York

Sean O'Sullivan, Managing Partner, SOSV at SOSV is an active investor based in New York City, New York. This profile covers what Sean O'Sullivan backs, at which stage, and how founders can reach out in 2026.

Investor type: AngelVCPECorporate VCInvestment PartnerAccelerator
Stages: Early Stage VentureSeed
Invests in: Artificial IntelligenceHealthcare & BiotechDigital Health & HealthTechBiotech & PharmaMedTech & Medical DevicesSaaS & EnterpriseConsumer & RetailConsumer Goods (CPG)
Location: New York City, New York
Typical check: $375K
Past investments: 2

Notable investments

ZifyCarma

How to reach Sean O'Sullivan

Angels and operators like Sean O'Sullivan reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.

Frequently Asked Questions

What does Sean O'Sullivan invest in?

Sean O'Sullivan invests in Artificial Intelligence, Healthcare & Biotech, Digital Health & HealthTech and Biotech & Pharma, typically at Early Stage Venture and Seed. Match your sector and stage, then reach out with a personalized pitch.