Andreessen Horowitz
Get verified emails for Andreessen Horowitz employeesAbout Andreessen Horowitz
Andreessen Horowitz, known as a16z, was founded in 2009 by Marc Andreessen and Ben Horowitz and is based in Menlo Park, California. Founded in 2009, the firm invests in technology companies from seed to late stage across consumer, enterprise, bio/healthcare, crypto, fintech, and games.
a16z describes itself as stage agnostic and focuses on backing entrepreneurs building technology businesses. Its general partners include former founders, operators, CEOs, and CTOs with experience across areas such as biology, crypto, distributed systems, security, marketplaces, and financial services.
The firm works with a network that includes technical and executive talent, media and marketing resources, Fortune 500 and Global 2000 companies, and other technology decision makers. It has 201-500 employees and provides portfolio companies with access to expertise and insights across company building.
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Insights
Updated 21 Aug 2026Andreessen Horowitz is surfacing in capital-intensive defense and crypto activity. Its name is tied to Castelion’s $1 billion Series C at a $13 billion valuation, and to an on-chain transfer of 89,470 HYPE tokens, worth about $6.6 million, to Wintermute. Those signals point to a firm that remains active in sectors where frontier technology and market structure are moving fast.
Castelion suggests a wider tilt toward hard-tech and national security markets. The company says it wants to manufacture hypersonic weapon systems at lower cost, while also building longer-range strike and defensive systems, which puts Andreessen Horowitz alongside startups focused on industrializing advanced defense production rather than simply backing software.
Both investor positioning and public visibility show up in the sources. Andreessen Horowitz is named as a co-lead on the Castelion round with Carlyle and JP Morgan Chase, and its crypto-linked wallet activity was flagged as likely intended for a sale. Scott Kupor’s role leading Trump’s return-to-office push at the Office of Personnel Management also keeps the firm’s leadership in view beyond investing.
Frequently asked questions
Andreessen Horowitz is headquartered in Menlo Park, California, United States.
Andreessen Horowitz has 201-500 employees according to its company profile.
Andreessen Horowitz operates in the Venture Capital & Private Equity sector. Public valuation figures are not always disclosed for private companies.