Jeff Kostermans
Angel investor in San Francisco
San Francisco, California
Jeff Kostermans, Angel investor in San Francisco is an active investor based in San Francisco, California. This profile covers what Jeff Kostermans backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelOperator
- Stages
- Pre SeedSeed
- Invests in
- Healthcare & BiotechSaaS & EnterpriseConsumer & RetailDeveloper Tools & DataMedia & ContentMarketplaceMarketing & AdTechSocial & Community
- Location
- San Francisco, California
- Typical check
- $150K
- Past investments
- 9
Notable investments
Berkeley SkyDeck
Adobe
NewsWhipTaleo - Acquired by Oracle
Lucidworks
OracleZignal LabsHow to reach Jeff Kostermans
Angels and operators like Jeff Kostermans 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
This profile is part of Round Funded, an investor database and outreach platform for founders. It covers 60,000+ active VCs, angels, family offices and accelerators with verified contacts, lets you send pitches from your own Gmail, and includes a free Data Room for your raise. How this data is built.
Cite this page
Round Funded. "Jeff Kostermans." Round Funded investor database, updated September 28, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/jeff-kostermans
Frequently Asked Questions
What does Jeff Kostermans invest in?
Jeff Kostermans invests in Healthcare & Biotech, SaaS & Enterprise, Consumer & Retail and Developer Tools & Data, typically at Pre Seed and Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Jeff Kostermans invest at?
Jeff Kostermans typically invests at Pre Seed and Seed. Lead with traction that fits the stage when you reach out.
What is Jeff Kostermans's typical check size?
Jeff Kostermans typically writes checks around $150K. 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.