The US Department of Justice is investigating Andreessen Horowitz over whether the venture capital firm improperly placed partners on the boards of competing artificial intelligence companies, potentially violating a 112-year-old antitrust law.
The probe, first reported by Bloomberg on Monday, has been underway for nearly a year. It centers on two board seats: co-founder Ben Horowitz sits on the board of data infrastructure giant Databricks, valued at $190 billion, while partner Martin Casado serves on the board of Fivetran, which merged with dbt Labs in June.
Section 8 of the Clayton Act
The investigation invokes Section 8 of the Clayton Act, a statute dating to 1914 that prohibits an individual or entity from serving on the boards of competing companies. Prosecutors are examining whether Horowitz and Casado function as agents of the firm on competing boards, effectively creating an unlawful board interlock through two separate a16z partners.
A Justice Department spokesperson issued a statement that neither confirmed nor denied the inquiry, according to Forbes. The department has made no final decision, and the matter could end without action.
VC Industry Braces for Precedent
The probe is rattling Silicon Valley. If the DOJ applies Section 8 aggressively to venture capital, the industry could be forced to rethink how it manages board representation across portfolio companies. An August 2023 analysis in the ABA’s Antitrust Magazine concluded that the deputization theory has weak statutory grounding, but prosecutors may be testing its limits.
If a16z is forced to surrender a seat, founders may place less value on board commitments from top-tier VCs, given that those investors might be forced to step down if a portfolio overlap creates a future conflict.
Fivetran’s all-stock merger with dbt Labs completed on June 1, 2026, complicating the picture further. The combined entity operates in overlapping areas with Databricks, intensifying the competitive overlap the DOJ is examining. Earlier Section 8 enforcement cases reached 13 directors across 10 boards, per Implicator AI.
The investigation comes at a sensitive time for a16z, whose leadership has cultivated close ties with the Trump administration. TechCrunch reported that the probe has baffled many in the VC community, who view the application of a century-old statute to modern venture governance as an aggressive interpretive leap. The outcome could reshape how the largest venture firms manage board influence across their AI portfolios.
Sources: Bloomberg; Forbes; TechCrunch; Implicator AI; American Bar Association Antitrust Magazine
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