Sean Duffy
Angel investor in San Francisco
San Francisco, California
Sean Duffy, Angel investor in San Francisco is an active investor based in San Francisco, California. This profile covers what Sean Duffy backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelInvestment Partner
- Stages
- Seed
- Invests in
- Healthcare & BiotechDigital Health & HealthTechBiotech & PharmaSaaS & EnterpriseConsumer & RetailDeveloper Tools & DataIoT & Connected DevicesEdTech
- Location
- San Francisco, California
- Typical check
- $250K
- Past investments
- 1
Notable investments
Big HealthHow to reach Sean Duffy
Angels and operators like Sean Duffy 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 Accelerator.
Connect with Sean Duffy
Frequently Asked Questions
What does Sean Duffy invest in?
Sean Duffy invests in Healthcare & Biotech, Digital Health & HealthTech, Biotech & Pharma and SaaS & Enterprise, typically at Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Sean Duffy invest at?
Sean Duffy typically invests at Seed. Lead with traction that fits the stage when you reach out.
What is Sean Duffy's typical check size?
Sean Duffy typically writes checks around $250K. Use it as a signal for whether your raise fits their stage.
How do I contact Sean Duffy?
Unlock Sean Duffy's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.