Runtime Ventures

Co-founders David Endler and Michael Sutton serve as General Partners and collectively make investment decisions. Both are former cybersecurity founders and operators with prior exits, operating a consensus-driven process given the small, tightly integrated team structure shown on Runtime's website.

The firm's sourcing model relies on the depth of its founders' practitioner networks within the cybersecurity industry. As acknowledged by portfolio company founders like those from Claroty and Duo Security, Runtime's reputation as an operator-led fund attracts early referrals before companies formally reach market, creating an informal but repeatable origination channel.

All publicly disclosed investment activity points exclusively to direct seed-stage equity positions in operating companies. There is no indication on the firm's website or in available materials that Runtime engages in fund-of-funds commitments, secondary purchases, or later-stage follow-on vehicles.

Runtime's mandate is singularly focused on cybersecurity startups; the firm does not mention activity in adjacent enterprise software verticals such as general SaaS, fintech, or digital health. No evidence exists of investments outside seed-stage enterprise security software and infrastructure.

Runtime does not explicitly market a co-investment program, but testimonials on its website indicate a collaborative approach where the firm joins seed rounds with other security-focused investors. The firm's operators view their value as augmenting, rather than displacing, syndicate partners in early-stage rounds.

Portfolio company founders cite Runtime's role in facilitating recruitment of key hires and interfacing on product strategy during the formative years. These operational support activities are delivered directly by the General Partners and the Operating Partner, reflecting a service model grounded in practitioner experience rather than a formalized platform team.

Public records and the firm's own communications do not indicate the existence of a related philanthropic foundation, a real-asset arm, or parallel funds. The firm appears to operate a single seed-stage venture practice from its Arlington headquarters.