Frank Willemsen
Member Board of Directors at Sand Hill Angels
Los Altos, California
Frank Willemsen, Member Board of Directors at Sand Hill Angels is an active investor based in Los Altos, California. This profile covers what Frank Willemsen backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelVCPE
- Stages
- Early Stage VenturePre SeedSeed
- Invests in
- Mobility & LogisticsHealthcare & BiotechConsumer & RetailMarketplace
- Location
- Los Altos, California
- Typical check
- $250K
- Past investments
- 71
Notable investments
Jump
CirrusMD
AngazaCargoChiefFluxion Biosciences
LiftopiaMovellus
AirPairAirBanq
RenovoRx
Limelight PlatformHow to reach Frank Willemsen
Angels and operators like Frank Willemsen 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. "Frank Willemsen." Round Funded investor database, updated September 9, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/frank-willemsen
Frequently Asked Questions
What does Frank Willemsen invest in?
Frank Willemsen invests in Mobility & Logistics, Healthcare & Biotech, Consumer & Retail and Marketplace, typically at Early Stage Venture, Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Frank Willemsen invest at?
Frank Willemsen typically invests at Early Stage Venture, Pre Seed and Seed. Lead with traction that fits the stage when you reach out.
What is Frank Willemsen's typical check size?
Frank Willemsen 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.