DOJ's a16z probe puts a venture standard on trial: partners on boards of rival portfolio companies
A nearly year-old interlocking-directorate inquiry names Databricks and Fivetran. The usual remedy is a resignation, which makes a board seat a term of investment worth repricing.
The Investor · Invest desk
What happened
- Andreessen Horowitz is the focus of a Justice Department antitrust probe over whether its investment partners are improperly serving on the boards of competing artificial intelligence companies, according to people familiar with the matter.
- The investigation is nearly a year old, had not been previously reported, and was opened around the same time as the merger review.
- A firm like a16z does not just write checks: it takes board seats, installs partners as directors, and actively shapes strategy at portfolio companies, creating potential for anticompetitive information sharing when those companies operate in overlapping markets.
- The companies at issue include Databricks Inc. and Fivetran Inc., both backed by Andreessen Horowitz.
- Both Databricks and Fivetran help businesses collect, organize and analyze massive troves of data.
Why it matters
The Justice Department has spent close to a year investigating whether Andreessen Horowitz's investment partners are improperly serving on the boards of competing artificial intelligence companies, according to people familiar with the matter cited by Fortune [1] [2]. What is exposed here is not one careless directorship but the standard venture template: a firm that takes a board seat with the check, installs a partner as director, and then does it again in an adjacent company [17].
The named pair is Databricks and Fivetran, both backed by the firm and both in the business of helping companies collect, organize and analyze large volumes of data [3] [4]. Co-founder Ben Horowitz sits on the Databricks board; partner Martin Casado sits on Fivetran's [18]. Casado was also a director of dbt Labs, which Fivetran acquired in June [19]. The DOJ reviewed that deal for months after its October announcement and cleared it unconditionally [20], having opened the interlock inquiry around the same time and kept it running after the deal closed [5]. Read plainly, the agency treated the merger and the board question as separate matters and let the second one live [28].
Section 8 of the Clayton Act, passed in 1914, bars a single person from sitting on the boards of two competing companies [6]. The wrinkle is that more than one individual director is at issue, so the firm itself is in the frame; the statute is worded to reach companies as well as individuals and a handful of courts have agreed, which still leaves a16z an avenue to contest any allegation [21].
The remedy history is unglamorous. Under Jonathan Kanter the DOJ pushed directors off boards rather than into court: Ari Emanuel left Live Nation's board in 2021 [7], and directors at more than 10 other companies exited in 2022 and 2023 [8]. Resolving these matters typically means someone resigns from one of the two boards [22]. That is cheap for a fund that wants information rights and expensive for one whose pitch is governance.
The scale explains the attention. Andreessen Horowitz managed $90 billion as of January and has raised a $15 billion fund, its largest, announced in January 2026 [9] [10] [11], or roughly a sixth of assets under management [24]. Its limited partners include sovereign wealth funds, pension funds and university endowments [23]. Databricks is an IPO candidate in the portfolio, and Horowitz holds billions of dollars in potential returns from lead positions dating back to a $14 million round in 2013 [25] [26].
Politics sits on top. Andreessen and Horowitz each donated millions in 2024 to a group aligned with then-candidate Donald Trump [12]; Horowitz later gave $2.5 million to a super PAC supporting Kamala Harris [13]; and Bloomberg News has reported that the firm successfully pushed the administration to remove many AI safety guardrails [14].
Watch three things. The DOJ has made no final decision and the matter could end with no action [15]; spokespeople for Databricks and the department declined to comment, and Andreessen Horowitz and Fivetran did not respond [27]. Accounts of how far along it is diverge: Fortune describes a nearly year-old inquiry, while a summary of Axios reporting says no charges, targets or timelines have emerged and the probe appears preliminary [2] [16]. And the real signal will not be a court filing but a quiet director departure at Databricks or Fivetran, followed by term sheets elsewhere that convert board seats into observer rights.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
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- [1]
Andreessen Horowitz is the focus of a Justice Department antitrust probe over whether its investment partners are improperly serving on the boards of competing artificial intelligence companies, according to people familiar with the matter.
- [2]
The investigation is nearly a year old, had not been previously reported, and was opened around the same time as the merger review.
- [3]
The companies at issue include Databricks Inc. and Fivetran Inc., both backed by Andreessen Horowitz.
- [4]
Both Databricks and Fivetran help businesses collect, organize and analyze massive troves of data.
- [5]
The investigation has continued after the Fivetran/dbt Labs deal was completed.
- [6]
Section 8 of the Clayton Antitrust Act, passed in 1914, prohibits a single person from serving on the boards of two competing companies.
- [7]
Under then Assistant Attorney General Jonathan Kanter, the DOJ forced directors to resign from a number of boards; in 2021 then Endeavor Group Holdings CEO Ari Emanuel stepped down from the board of Live Nation.
- [8]
In 2022 and 2023 directors from more than 10 other companies exited boards to resolve interlocking-directorate concerns.
- [9]
As of January, Andreessen Horowitz had $90 billion in assets under management.
- [10]
The firm recently raised a $15 billion fund, its largest haul ever, to invest across the startup ecosystem.
- [11]
a16z raised over $15 billion in its largest-ever funding round announced in January 2026, pushing total assets under management above $90 billion.
- [12]
Horowitz and co-founder Marc Andreessen each donated millions of dollars in 2024 to a group aligned with then presidential candidate Donald Trump.
- [13]
Later in 2024 Horowitz gave $2.5 million to a super PAC that supported Democratic presidential candidate Kamala Harris.
- [14]
The firm has been a key voice on AI policy and successfully pushed the administration to remove many safety guardrails on the use of the technology, Bloomberg News has reported.
- [15]
The Justice Department has not made any final decisions on how to proceed with the investigation, which could end with no action, according to people familiar with the matter.
- [16]
No specific charges, targets, or timelines have emerged from the investigation, which appears to be in its preliminary stages.
- [17]
A firm like a16z does not just write checks: it takes board seats, installs partners as directors, and actively shapes strategy at portfolio companies, creating potential for anticompetitive information sharing when those companies operate in overlapping markets.
- [18]
Andreessen Horowitz co-founder Ben Horowitz serves on the board of Databricks, and partner Martin Casado is a board member of Fivetran.
- [19]
Casado was also on the board of dbt Labs, a similar company, which was acquired by Fivetran in June.
- [20]
The Justice Department conducted a months-long review of the Fivetran/dbt Labs deal, first announced in October, but ultimately cleared it unconditionally.
- [21]
In the Andreessen Horowitz probe the involvement of the firm itself on competing boards is at issue because more than one individual director is involved; the law is worded to apply to companies as well as individuals and a handful of courts have agreed, but it could still provide an avenue for the firm to challenge any allegations.
- [22]
Resolving such investigations typically requires that directors step down from one of the competing boards.
- [23]
Investors in a16z's funds include sovereign wealth funds, pension funds and university endowments.
- [24]
The $15 billion fund is equal to roughly one sixth of the firm's $90 billion in assets under management.
- [25]
Databricks is an IPO contender within Andreessen Horowitz's portfolio.
- [26]
Horowitz is sitting on billions of dollars in potential returns due to continued lead investments in Databricks, dating back to a $14 million fundraising in 2013.
- [27]
Spokespeople for Databricks and the Justice Department declined to comment, and spokespeople for Andreessen Horowitz and Fivetran did not respond to requests for comment.
- [28]
The DOJ handled the merger and the board-interlock question as separate matters, clearing the transaction while keeping the directorship inquiry open.
Sources
2 independent publishers whose own reporting we read for this story.
- cryptobriefing.comAndreessen Horowitz probed by US DOJ over board conflicts
1 article · August 17, 2026
- fortune.comAndreessen Horowitz focus of DOJ probe over board directors
1 article · August 17, 2026
Topics and entities
Topics
- Antitrust Enforcement
- Venture Capital Governance
- Tech Policy and Political Influence
- AI Data Infrastructure Consolidation
Entities
- Ben Horowitz
- Martin Casado
- Marc Andreessen
- U.S. Department of Justice
- Live Nation Entertainment
- Clayton Antitrust Act Section 8
- Databricks
- Andreessen Horowitz
- Fivetran