Justin Rosenstein
Angel investor in California
California
Justin Rosenstein, Angel investor in California is an active investor based in California. This profile covers what Justin Rosenstein backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelInvestor
- Stages
- Pre SeedSeed
- Invests in
- Artificial IntelligenceFintechHealthcare & BiotechBiotech & PharmaSaaS & EnterpriseIoT & Connected DevicesGaming & EntertainmentMedia & Content
- Location
- California
- Typical check
- $150K
- Past investments
- 3
Notable investments
How to reach Justin Rosenstein
Angels and operators like Justin Rosenstein 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 Justin Rosenstein
Frequently Asked Questions
What does Justin Rosenstein invest in?
Justin Rosenstein invests in Artificial Intelligence, Fintech, Healthcare & Biotech and Biotech & Pharma, typically at Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Justin Rosenstein invest at?
Justin Rosenstein typically invests at Pre Seed and Seed. Lead with traction that fits the stage when you reach out.
What is Justin Rosenstein's typical check size?
Justin Rosenstein typically writes checks around $150K. Use it as a signal for whether your raise fits their stage.
How do I contact Justin Rosenstein?
Unlock Justin Rosenstein's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.