Stone Mountain Ventures

Stone Mountain Ventures is a healthcare-focused venture capital firm founded in 2021 by John Diaz and based in Dallas, Texas. The firm invests exclusively at the pre-seed and seed stages, backing companies building solutions to improve the healthcare system across infrastructure, services, and technology. Its stated technical domains include healthcare AI, healthcare data, healthcare technology, and healthcare infrastructure, with sector coverage spanning behavioural health, care delivery, and healthcare services.

Typical investments range from $100,000 to $300,000 in equity. Capital has been deployed through two funds, with more than 30 investments made across them. The firm describes its mandate as supporting “durable builders” working on the healthcare system, and its involvement extends beyond capital to strategic guidance, investor and customer introductions, and support around critical decisions for portfolio companies.

The founder's background is rooted in healthcare: Diaz's family worked in care delivery, and his own experiences as a patient exposed fragmented workflows and poor coordination in the system. The firm's stated operating posture is to move quickly and stay close to founders - a point of differentiation at the pre-seed and seed stages, where the investment is largely a bet on the founding team.