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.
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About this profile
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Cite this page
Round Funded. "Sean Duffy." Round Funded investor database, updated September 8, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/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 founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.