Adam Zeplain is the Co-Founder and Managing Partner of Mark VC. See sector focus and contact routes.
Adam Zeplain is the Co-Founder and Managing Partner of Mark VC, an Austin-based firm that invests in **early-stage** companies (primarily **Seed** and **Series A**) across **security & defense**, **healthcare technology**, **consumer technology**, and **enterprise SaaS** [2][3]. His distinctive thesis involves conducting deep **psychological due diligence** by building a "360-degree behavioral map" of founders through interviews with their close contacts before investing [4][7]. Notable portfolio companies include category leaders such as **CrowdStrike**, **Reddit**, **Ring**, **Anduril**, **Apptronik**, and **ZenBusiness** [2][3]. While exact check sizes are not publicly disclosed, his typical investment range is estimated between **$500K and $5M** for initial deals [7][8].
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