Andreessen Horowitz

Andreessen Horowitz, known as a16z, is one of Silicon Valley's most influential venture capital firms and a prolific backer of AI companies. It has invested across the stack — frontier and open-model labs, tooling, and applications — and its scale, media presence, and thesis-driven approach make it a leading shaper of narratives and capital flows in AI.

Founded in 2009 by Marc Andreessen and Ben Horowitz, a16z grew into a multi-strategy investment firm managing tens of billions of dollars across venture, growth, crypto, and other funds. It is known for a hands-on platform model and for publishing widely read theses on technology trends.

In AI, a16z has backed a broad portfolio spanning model labs and open-source players, developer tooling, and application companies, and has been an outspoken advocate for open models and lighter-touch AI regulation. It participated in landmark rounds including Thinking Machines Lab and Safe Superintelligence, among many others.

The firm's influence goes beyond capital: its research, events, and public commentary help set the agenda for how founders and policymakers think about AI. As one of the largest and most visible investors in the space, a16z is a central node in the AI funding ecosystem.