Valor and Atreides co-lead $50 million bet on Flow Engineering’s hardware AI

Building a rocket is hard. Proving that the rocket will do what it’s supposed to do might be harder.

Flow Engineering, a San Francisco hardware software company, has raised a $50 million Series B to attack that second problem. Valor Equity Partners and Atreides Management co-led the round, which gives the company a post-money valuation of $750 million.

The round was announced on September 30, 2026.

Who wrote the checks

Valor and Atreides sit at the top of the cap table for this round. They weren’t alone.

Sequoia Capital, which led Flow’s Series A, came back for another helping. Sequoia’s Roelof Botha also invested personally.

The new names on the list include Thomas Wolf of Hugging Face, Nico Rosberg, and Jonas von Malottki.

Some quick math on the terms. The $50 million raise represents roughly 6.7% of the company’s $750 million post-money valuation.

What Flow actually does

Every piece of serious hardware starts with requirements. The brakes must stop the car within a certain distance. The engine must survive a certain temperature. The drone must hold a certain altitude in certain winds.

Then engineers have to prove every one of those requirements is met. This is called validation and verification, or V&V in the trade.

Flow’s answer is what it calls a “systems graph.” The platform links requirements, design, simulations, and verification into one connected map that updates in real time.

On top of that graph, Flow runs AI agents. These handle real-time impact analysis and conflict detection, flagging when a design change collides with an existing requirement.

The company’s claim is that this can compress hardware iteration cycles that may currently take months or years down to a matter of days.

Flow recently launched Flow v3, the latest version of its platform, and has scaled up its headquarters. The new capital lands as the company moves from early product to broader rollout.

The customer list does a lot of talking

Its platform is already in use at Anduril, Joby, Stoke Space, Rivian, and General Motors’ PPU. It’s also being used by RV Tech, the joint venture between Rivian and Volkswagen.

Why complex hardware needs new tools

Flow wants to become the leading requirements and verification solution for complex hardware projects across industries, with a particular focus on space and defense.

Disclosure: This article was edited by Diego Almada Lopez. For more information on how we create and review content, see our Editorial Policy.