Alex Rosen
Angel investor in San Francisco
San Francisco, California
Alex Rosen, Angel investor in San Francisco is an active investor based in San Francisco, California. This profile covers what Alex Rosen backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelVCInvestor
- Stages
- Series A
- Invests in
- Artificial IntelligenceFintechHealthcare & BiotechBiotech & PharmaSaaS & EnterpriseConsumer & RetailDeveloper Tools & DataIoT & Connected Devices
- Location
- San Francisco, California
- Typical check
- $1M
- Past investments
- 15
Notable investments
Braze
Electric ObjectsFunzio
SafeGraph
Leanplum
Fastly
FLIPDoctorC
Uplift
TrifactaGREE
OutlierHow to reach Alex Rosen
Angels and operators like Alex Rosen 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. "Alex Rosen." Round Funded investor database, updated September 8, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/alex-r
Frequently Asked Questions
What does Alex Rosen invest in?
Alex Rosen invests in Artificial Intelligence, Fintech, Healthcare & Biotech and Biotech & Pharma, typically at Series A. Match your sector and stage, then reach out with a personalized pitch.
What stage does Alex Rosen invest at?
Alex Rosen typically invests at Series A. Lead with traction that fits the stage when you reach out.
What is Alex Rosen's typical check size?
Alex Rosen typically writes checks around $1M. 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.