The US Department of Justice is investigating Andreessen Horowitz, the Silicon Valley venture capital powerhouse better known as a16z, over potential conflicts of interest tied to its board seats at multiple companies. The probe centers on whether shared directorships across competing firms amount to the kind of interlocking arrangements that antitrust law was designed to prevent.
a16z raised over $15 billion in its largest-ever funding round announced in January 2026, pushing its total assets under management above $90 billion.
The interlocking directorate problem
The legal concept at the heart of this probe is older than Silicon Valley itself. Section 8 of the Clayton Antitrust Act, passed in 1914, prohibits a single person from serving on the boards of two competing companies. The logic is straightforward: if the same person sits in both boardrooms, the two companies are less likely to compete aggressively against each other.
Venture capital firms have long existed in a gray area around this rule. A firm like a16z doesn’t just write checks. It takes board seats, installs partners as directors, and actively shapes strategy at its portfolio companies. When those portfolio companies operate in overlapping markets, particularly in fast-moving sectors like artificial intelligence, the potential for anticompetitive information sharing grows.
The DOJ’s interest in interlocking directorates isn’t new. Federal antitrust enforcers have ramped up scrutiny of these arrangements in recent years, sending warning letters and pushing for resignations from boards where conflicts were apparent.
A firm with political exposure
Co-founders Marc Andreessen and Ben Horowitz made significant political contributions to Donald Trump’s 2024 presidential campaign.
The firm manages capital across several dedicated funds, including vehicles focused on crypto, bio, games, and infrastructure. Its crypto fund has backed blockchain projects including Digital Asset Holdings. There are no indications that the current DOJ investigation relates to the firm’s cryptocurrency activities or any specific token investments.
What this means for venture capital
Investors in a16z’s funds, which include sovereign wealth funds, pension funds, and university endowments, will be watching closely. With over $90 billion in assets under management, any disruption to a16z’s investment model has the potential to move markets in the sectors where it operates most heavily.
No specific charges, targets, or timelines have emerged from the investigation, which appears to be in its preliminary stages.