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 Accelerator.
Connect with 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 I contact Jeff Kostermans?
Unlock Jeff Kostermans's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.