DOJ probes a16z over seats on rival AI boards
The Justice Department has spent nearly a year looking at the most ordinary thing a venture firm does: putting partners on boards.
Andreessen Horowitz is the focus of a Justice Department antitrust probe over whether its investment partners are improperly serving on the boards of competing AI companies, according to people familiar with the matter. The investigation, which had not been previously reported, is nearly a year old. Among the companies at issue are Databricks — one of the world's most valuable privately held technology firms, where co-founder Ben Horowitz sits on the board — and Fivetran, where partner Martin Casado is a director. Both companies sell the layer that makes enterprise AI usable: they help businesses collect, organize, and analyze huge amounts of data.
The overlap is not theoretical. Casado was also on the board of dbt Labs, a similar data company that Fivetran acquired in June after a deal first announced last October. The Justice Department spent months reviewing that merger and ultimately cleared it with no conditions. The board-seat investigation opened around the same time as that review and kept going after the deal closed. The people who described the matter asked not to be named because it is confidential. Resolving probes like this typically means a director steps down from one of the competing boards.
That sequence is the story. Clearing a merger answers whether two companies may combine. It does not answer whether the same partnership should keep a window into companies that still compete — or that just swallowed a competitor. Databricks and Fivetran are not chatbots, but they are the plumbing chatbots run on: pipelines, warehouses, transformation, the unglamorous work of turning a company's mess into something a model can use. If those businesses are close enough that overlapping directors raise an antitrust question, the AI data stack has crossed a line the government is willing to police.
Why it matters: a16z is not a silent check-writer in this cycle. Its partners sit on the boards of the companies that own the data pipelines, the model shops, and the application layer. That is how venture firms claim to add value, and it is also how they create the conflict antitrust law has always worried about — a small group of people seeing competitive plans at two firms that sell into the same customer. A year-old probe that survived an unconditional merger clearance is not a rumor that faded. It is a signal that the department will keep pulling on board composition even after it lets a deal through.
The take is simple. The AI boom packed the same partners onto the same category of boards because there were only so many people who understood the category. That looked like expertise. It now looks like an exhibit. If Databricks and Fivetran are in scope, every multi-board AI partner at every large firm should assume the next letter is not hypothetical.
What to watch: whether Horowitz or Casado leaves a board — and whether the probe names companies beyond the two already identified.
Should the same VC partners sit on the boards of competing AI companies? Tell us in the comments.
