Andreessen Horowitz

Founded in 2009 by Marc Andreessen and Ben Horowitz, Andreessen Horowitz (a16z) quickly ascended to become one of the most influential venture capital firms in Silicon Valley. The firm launched with an initial capitalization of $300 million and has since grown to manage $90 billion in assets as of 2026. It is known for its stage-agnostic approach, investing in seed-stage startups through late-stage growth companies.

The firm's investment focus is broad, spanning consumer, enterprise, healthcare, crypto, fintech, and gaming sectors. In 2023, it launched the American Dynamism fund to support companies building in the national interest, focusing on hard tech such as defense, space, and robotics. a16z is noted for its intensive 'services' model, providing portfolio companies with access to specialized expertise in marketing, recruiting, and business development.

Historically, the firm has been an early backer of defining internet companies including Facebook, Twitter, Airbnb, and Slack. More recently, it has become a dominant force in the cryptocurrency space and artificial intelligence, backing major players like Coinbase and various generative AI startups. The firm operates primarily out of Menlo Park and San Francisco, California.