The US Department of Justice is investigating Andreessen Horowitz, the Silicon Valley venture capital firm known as a16z, over potential conflicts of interest tied to its board seats at multiple competing companies. The firm raised over $15 billion in January 2026, pushing its total assets under management above $90 billion. The probe centers on whether shared directorships across competing firms violate Section 8 of the Clayton Antitrust Act, a 1914 law prohibiting a single person from serving on the boards of two competing companies. Co-founders Marc Andreessen and Ben Horowitz made significant political contributions to Donald Trump’s 2024 presidential campaign. The investigation appears to be in its preliminary stages with no specific charges or timelines announced.
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