Justin Rosner
Partner at Battery Ventures
Boston, Massachusetts
Justin Rosner, Partner at Battery Ventures is an active investor based in Boston, Massachusetts. This profile covers what Justin Rosner backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelVCPEInvestment PartnerInvestor
- Stages
- Early Stage VentureSeries ASeries B
- Invests in
- Healthcare & BiotechMedTech & Medical DevicesManufacturing & IndustrialSaaS & EnterpriseBiotech & Pharma
- Location
- Boston, Massachusetts
- Typical check
- $1M
- Past investments
- 10
Notable investments
How to reach Justin Rosner
Angels and operators like Justin Rosner 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 Rosner
Frequently Asked Questions
What does Justin Rosner invest in?
Justin Rosner invests in Healthcare & Biotech, MedTech & Medical Devices, Manufacturing & Industrial and SaaS & Enterprise, typically at Early Stage Venture, Series A and Series B. Match your sector and stage, then reach out with a personalized pitch.
What stage does Justin Rosner invest at?
Justin Rosner typically invests at Early Stage Venture, Series A and Series B. Lead with traction that fits the stage when you reach out.
What is Justin Rosner's typical check size?
Justin Rosner typically writes checks around $1M. Use it as a signal for whether your raise fits their stage.
How do I contact Justin Rosner?
Unlock Justin Rosner's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.