Stephanie Koster
Managing Partner at Subutai Capital Partners
Redmond, Washington
Stephanie Koster, Managing Partner at Subutai Capital Partners is an active investor based in Redmond, Washington. This profile covers what Stephanie Koster backs, at which stage, and how founders can reach out in 2026.
Stephanie Koster is Managing Partner of Subutai Capital Partners and CEO of Defense Technologies Inc, with investments in the space and defense manufacturing ecosystem.
- Investor type
- VC
- Stages
- Early Stage VentureLate Stage Venture
- Invests in
- Manufacturing & IndustrialGovTech & DefenseClimate & Energy
- Location
- Redmond, Washington
- Typical check
- $3.8M
How to reach Stephanie Koster
Angels and operators like Stephanie Koster 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.
Connect with Stephanie Koster
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.
Frequently Asked Questions
What does Stephanie Koster invest in?
Stephanie Koster invests in Manufacturing & Industrial, GovTech & Defense and Climate & Energy, typically at Early Stage Venture and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Stephanie Koster invest at?
Stephanie Koster typically invests at Early Stage Venture and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Stephanie Koster's typical check size?
Stephanie Koster typically writes checks around $3.8M. Use it as a signal for whether your raise fits their stage.
How do I contact Stephanie Koster?
Unlock Stephanie Koster's verified email on Round Funded and send a personalized pitch. We surface only deliverable contacts so your outreach lands.
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.