Mark Jantzen
Managing Director at JWI Capital, LLC
Cleveland, Ohio
Mark Jantzen, Managing Director at JWI Capital, LLC is an active investor based in Cleveland, Ohio. This profile covers what Mark Jantzen backs, at which stage, and how founders can reach out in 2026.
- Investor type
- Micro VCPE
- Stages
- SeedSeries ASeries BLate Stage Venture
- Invests in
- Manufacturing & IndustrialSupply Chain & LogisticsHealthcare & Biotech
- Location
- Cleveland, Ohio
- Typical check
- $2M
- Past investments
- 3
Notable investments
How to reach Mark Jantzen
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About this profile
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Round Funded. "Mark Jantzen." Round Funded investor database, updated September 9, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/mark-jantzen
Frequently Asked Questions
What does Mark Jantzen invest in?
Mark Jantzen invests in Manufacturing & Industrial, Supply Chain & Logistics and Healthcare & Biotech, typically at Seed, Series A, Series B and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Mark Jantzen invest at?
Mark Jantzen typically invests at Seed, Series A, Series B and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Mark Jantzen's typical check size?
Mark Jantzen typically writes checks around $2M. 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.