David Endler is a General Partner and Co-Founder at Runtime Ventures. See contact routes.
David Endler is a General Partner and Co-Founder at Runtime Ventures, a Arlington-based venture capital firm he launched in 2023 after a 25-year cybersecurity career that included founding SpyCloud and Jumpshot. His investment thesis targets pre-seed and seed-stage cybersecurity startups in the United States, specifically those with B2B enterprise models and product-led growth. Endler typically writes checks ranging from $250,000 to $2 million and often co-invests alongside strong lead investors rather than leading deals alone. Notable portfolio companies include RunReveal, which received a $7 million seed investment from the firm in August 2025, as well as other early-stage cyber innovators backed by the firm’s $32 million debut fund. Before becoming an investor, Endler served as Chief Product Officer at SpyCloud and CEO at Jumpshot, and he holds a published authorship of books such as “Hacking Exposed: VoIP”. His distinctive point of view emphasizes mentoring US-based entrepreneurs building security solutions for the enterprise, reflecting his deep technical background in anti-malware and account takeover prevention.
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