Justice Department Probes a16z Over Rival AI Board Seats

The Department of Justice is investigating Andreessen Horowitz over a rule that predates the AI boom by more than a century. According to reporting first published by Bloomberg on August 17, prosecutors are examining whether partners at the venture firm improperly sit on the boards of AI companies that compete with one another.

The specific pairing at the center of the probe is Databricks and Fivetran. Both handle the plumbing of enterprise data, collecting it, organizing it, and preparing it for the models businesses now want to build. Andreessen Horowitz has backed both. Co-founder Ben Horowitz sits on the Databricks board, and partner Martin Casado sits on the Fivetran board. To antitrust lawyers, that is a textbook description of the problem.

An old law meets a new industry

The statute in question bars what is called an interlocking directorate, a situation where the same person, or people from the same firm, hold board seats at rival companies. Section 8 of the Clayton Act has been on the books since 1914. The worry it addresses is straightforward: a single investor with a foot in both camps can soften competition between them, coordinate strategy, or steer two supposed rivals toward the same decisions.

The DOJ has been looking at this arrangement for close to a year, and it has not decided whether to act. When these cases resolve, they usually end quietly, with the person at issue stepping off one of the boards rather than a courtroom fight. What makes this one notable is the target. Andreessen Horowitz has been openly aligned with the Trump administration, and the investigation is proceeding anyway, a point Forbes underlined in its coverage.

The wider signal is what makes this worth watching. A handful of large venture firms now sit inside a big share of the AI industry at once, holding stakes and board seats across companies that are supposed to be racing each other. The same concentration has drawn scrutiny elsewhere. Anthropic has spent record sums lobbying in Washington, and regulators have been circling the tangle of cross-investments that ties chipmakers, labs, and their financiers together.

For now the probe is just that, a probe. No charges have been filed, and Andreessen Horowitz has not been accused of wrongdoing beyond the board arrangement itself. But it is a reminder that the money flowing into AI is dense enough, and interconnected enough, that a law written for the railroad age has found fresh work in the model age.