Mark Ein
Angel investor in Washington
Washington, District of Columbia
Mark Ein, Angel investor in Washington is an active investor based in Washington, District of Columbia. This profile covers what Mark Ein backs, at which stage, and how founders can reach out in 2026.
Mr. Mark Ein serves is the Founder and serves as Chief Executive Officer & Chairman at Venturehouse Group. He serves as Board Member at Custom Truck One Source. He serves as Executive Chairman at Kastle Systems International. He is an investor, entrepreneur, and philanthropist with over 24 years of experience building growth companies across diverse industries. He served as the Chairman and CEO of Capitol Investment Corp.VI. He currently served as the Chairman and CEO of Capitol Investment Corp. V, and VII and previously held similar roles at Capitol Investment Corp. I, II, III, and IV. His SPACs have completed successful business combinations with firms including Lindblad Expeditions and Two Harbors Investment Corp. He is also the Founder and CEO of Washington Esports Ventures and President of Leland Investments Inc.,. He is Co-Chairman of Kastle Holding Company LLC, the parent of Kastle Systems, His investment firm, Venturehouse, has backed companies such as XM Satellite Radio, Matrics Technologies, Cibernet Corporation, and VSGi. He founded the Washington Kastles, His earlier career includes positions at The Carlyle Group, Brentwood Associates, and Goldman Sachs. He currently serves on the boards of AgroFresh Solutions, VSGi, the District of Columbia Public Education Fund (as Chairman), and the United States Tennis Association. He has also held board roles at Doma Holdings, Kirlin Design Build, Suwannee Lumber, and Colson Group. He holds an MBA from Harvard Business School and earned a Bachelor of Science in Economics and Finance from the University of Pennsylvania's Wharton School in 1987.
- Investor type
- Angel
- Stages
- Early Stage VenturePre SeedLate Stage Venture
- Invests in
- SaaS & EnterpriseSports & Fitness
- Location
- Washington, District of Columbia
- Typical check
- $500K
- Past investments
- 6
Notable investments
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Cite this page
Round Funded. "Mark Ein." Round Funded investor database, updated September 8, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/mark-ein-111937-9
Frequently Asked Questions
What does Mark Ein invest in?
Mark Ein invests in SaaS & Enterprise and Sports & Fitness, typically at Early Stage Venture, Pre Seed and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Mark Ein invest at?
Mark Ein typically invests at Early Stage Venture, Pre Seed and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Mark Ein's typical check size?
Mark Ein typically writes checks around $500K. 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?
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