Andreessen Horowitz

What it is

Andreessen Horowitz (branded a16z) is a US venture capital and growth-equity firm headquartered in Menlo Park, California. Founded in June 2009 by Marc Andreessen and Ben Horowitz, it manages over US$100 billion in assets under management as of April 2026, spanning seed, venture, and growth stages. The firm invests across artificial intelligence, bio and healthcare, consumer, crypto and Web3, enterprise software, fintech, and defense technology, the last through its American Dynamism fund. It is registered as an investment adviser with the US Securities and Exchange Commission. The firm pioneered a "platform model" in which large teams of operating specialists (marketing, talent, legal, regulatory) are embedded to support portfolio companies, departing from the traditional lean-partnership structure that defined venture capital for decades.

History

Andreessen and Horowitz launched the firm in June 2009 with a US$300 million debut fund, during the depths of the global financial crisis, arguing that software would eat every industry. Early bets that paid off included Facebook (pre-IPO secondary), Airbnb, Lyft, GitHub (acquired by Microsoft for US$7.5 billion in 2018), and Coinbase (Nasdaq IPO in 2021). By 2018 the firm registered with the US SEC as an investment adviser, enabling it to hold liquid public securities alongside private stakes, blurring the line between venture and public-markets investing. The crypto practice launched in 2018 with a US$300 million fund and scaled to a ninth-largest digital-asset manager by 2023. The American Dynamism thesis, focused on defense and national-security technology, was codified into a dedicated fund in 2022 and has grown into the firm's most politically prominent strategy.

Current state

As of mid-2026, a16z manages over US$100 billion across more than a dozen fund vehicles. The largest single haul in the firm's history arrived in January 2026, when it closed over US$15 billion (see Fund VII) across five dedicated strategy vehicles: American Dynamism (US$1.18 billion), Apps (US$1.7 billion), Bio + Health (US$700 million), Infrastructure (US$1.7 billion), and Growth (US$6.75 billion). The raise represented roughly 18% of all US venture capital deployed in 2025, concentrating the industry's dry powder in a small set of mega-platform firms. In May 2026, a16z crypto closed its fifth fund at US$2.2 billion, bringing cumulative crypto AUM to US$9.8 billion. The American Dynamism vehicle co-led Anduril's US$5 billion Series H (see Anduril完成50亿美元H轮融资，估值翻番至610亿美元) alongside Thrive Capital in May 2026, at a US$61 billion valuation, part of the broader US defense-tech capital surge documented in 防务科技初创企业五个月融资146亿美元，打破2025年全年记录.

Relationships

Marc Andreessen sits on Meta's board of directors and has been one of the most vocal US technology advocates on AI, crypto, and industrial policy. Ben Horowitz focuses on cultural leadership and the American Dynamism thesis, with an active presence in US federal policy discussions. The firm has a formal Washington, DC office and has submitted regulatory comments to the US SEC on crypto market structure and to the White House on AI governance. Limited partners include US and international sovereign wealth funds, university endowments, and large pension funds, though the specific LP list is not publicly disclosed. Portfolio ties run across the current AI wave: a16z backed European AI startup Mistral AI, as well as xAI and Character.AI, alongside numerous AI infrastructure companies. Its crypto practice holds stakes in DeFi protocols and blockchain-infrastructure companies including ones that became publicly traded via Coinbase's 2021 listing.

What to watch

Whether US$100 billion AUM scale enables or constrains returns is the central question: large positions require large exits, narrowing the effective universe of outcomes and putting pressure on the growth fund in particular. The American Dynamism initiative is a long-horizon bet on whether Silicon Valley capital can consistently bring defense-tech companies through the US Pentagon procurement cycle, which typically runs five to ten years for full programs. Watch for how a16z navigates conflicts as it holds equity in competing AI companies simultaneously, a tension the firm's SEC registration requires it to manage formally. The a16z crypto franchise is a bellwether for institutional digital-asset sentiment: its fund-raising cadence and regulatory positioning in Washington will signal whether the asset class has achieved durable institutional acceptance in the US.