ORGANIZATION
Andreessen Horowitz
The venture capital firm Marc Andreessen co-founded with Ben Horowitz in 2009 — whose operator-centric investment thesis and public intellectual posture reshaped how Silicon Valley narrates itself.
Andreessen Horowitz, widely known as a16z, is the venture capital firm Marc Andreessen co-founded with Ben Horowitz in June 2009. The firm launched with $300 million under management and has grown to manage over $40 billion across funds targeting consumer, enterprise, fintech, biotech, crypto, and AI. Its founding thesis differentiated it from traditional Sand Hill Road firms by positioning partners as former operators rather than career investors, building an in-house services organization to support portfolio companies, and maintaining an unusually public intellectual posture through essays, podcasts, and policy interventions. The firm's portfolio has included Facebook, Twitter, Airbnb, Coinbase, GitHub, and numerous AI startups — investments that helped define the platform economy Andreessen's 2011 essay predicted.
In The You On AI Field Guide
The firm emerged during the post-2008 financial crisis, at a moment when conventional wisdom held that venture capital returns would be depressed for years. Andreessen and Horowitz's founding thesis — that software-native companies were entering a period of unprecedented returns because the substrate transformation was accelerating