The DOJ Is Investigating a16z Over Board Seats at Competing Companies. Here Is What That Means.

Key points

• The US Department of Justice has reportedly investigated Andreessen Horowitz for nearly a year over overlapping board seats at competing companies.
• The probe centres on the Clayton Act of 1914, an antitrust law that bars the same person from sitting on the boards of competing firms.
• Andreessen Horowitz partner Ben Horowitz sits on the board of data platform Databricks; partner Martin Casado sits on the board of Fivetran, a rival data company.
• The two companies were not direct competitors when a16z first invested in them, which could matter to how investigators weigh the case.

A famous venture capital firm is under federal scrutiny for something that sounds almost routine: putting partners on company boards.

Andreessen Horowitz, widely known as a16z, is one of Silicon Valley's most powerful investment firms. The Department of Justice has reportedly been investigating it for close to a year, according to TechCrunch AI. The question investigators are asking is whether two of its board seats, held at the same time by two different partners at two competing companies, broke the law.

What law are we actually talking about?

The Clayton Antitrust Act, passed in 1914, is the statute at the centre of this. Section 8 of that law, called the "interlocking directorates" rule, says that the same person cannot sit on the boards of two competing companies above a certain size. The idea is simple: if a single person can influence rivals from inside both boardrooms, they might share information or quietly coordinate strategy in ways that hurt competition.

The twist here is that no single person holds both seats. Ben Horowitz, a co-founder of a16z, sits on the board of Databricks, a company that helps businesses store and analyse large amounts of data. Martin Casado, another a16z partner, sits on the board of Fivetran, which helps businesses move data between software systems. The DOJ appears to be asking whether the firm itself, through two different partners, has the same effect as one person straddling both boards.

Applying Section 8 to venture capital firms rather than individuals is genuinely unusual. The law has existed for over a century but is rarely dusted off to target investors.

Why does this matter for ordinary investors and startups?

For most people, the immediate impact is indirect. But the case could reshape how venture capital firms, the companies that fund early-stage businesses, structure their deals going forward.

VC firms routinely take board seats as a condition of investment. A firm that backs dozens of companies will almost inevitably end up with partners sitting at rival tables, especially as markets shift and yesterday's friendly neighbours become tomorrow's competitors. That is exactly what seems to have happened here: Databricks and Fivetran were not direct rivals when a16z first backed them. The competitive overlap developed later.

If the DOJ's interpretation holds, firms might have to choose between selling a stake or surrendering a board seat whenever two of their portfolio companies drift into the same market. That would meaningfully change the economics of venture investing.

What happens next?

No charges have been filed. The investigation is still at the inquiry stage, which means the DOJ is gathering information rather than alleging wrongdoing.

The outcome will likely set a precedent either way. A finding against a16z would put every major VC firm on notice to audit its board positions. A finding in its favour would confirm that Section 8 does not easily stretch to cover a firm acting through multiple partners at once.

For now, both Databricks and Fivetran continue to operate normally. The partners remain on their respective boards.

Common questions

Could this affect the companies Andreessen Horowitz has invested in?

In the short term, probably not. Neither Databricks nor Fivetran is accused of wrongdoing, and day-to-day operations at both companies continue as normal.

Does this mean venture capital firms will have to give up board seats?

Not yet, and possibly never. This is one investigation, not a new rule. But if the DOJ pursues and wins a case on this theory, the legal pressure on VC firms to restructure overlapping board positions would increase significantly.