Runtime Ventures is a venture capital firm specializing in seed-stage investments within the cybersecurity sector. With offices in Arlington, Virginia, and Austin, Texas, the firm is dedicated to supporting and mentoring ambitious entrepreneurs during the early, formative stages of their startups.
Runtime Ventures focuses exclusively on pre-seed and seed-stage cybersecurity startups. The firm seeks to invest in innovative B2B cybersecurity companies with strong go-to-market potential, providing both capital and strategic support to help founders navigate the challenges of building successful ventures.
In April 2025, Runtime Ventures announced the launch of its debut fund with a capital commitment of $32 million. This fund aims to invest in and support early-stage cybersecurity startups, with individual investments ranging from $250,000 to $2 million. As of the announcement, the firm had already made 11 investments from this fund.
Leadership
Runtime Ventures was co-founded by General Partners David Endler and Michael Sutton. David Endler previously co-founded cybersecurity startups SpyCloud and Jumpshot, bringing extensive entrepreneurial experience to the firm. Michael Sutton is the founder of StoneMill Ventures and served as the Chief Information Security Officer (CISO) at Zscaler, contributing deep expertise in cybersecurity operations and investments.
Investment Strategy
The firm's strategy centers on leveraging the founders' extensive experience as cybersecurity operators and investors to provide not only capital but also mentorship and strategic guidance to portfolio companies. Runtime Ventures emphasizes the importance of having seasoned professionals who have scaled cybersecurity companies before to support new founders.
Notable Investments
Runtime Ventures has invested in several promising cybersecurity startups, including:
