AI hardware design startup Flow Engineering raises $50M Series B

Flow Engineering, a startup that builds AI tools for hardware design, has raised a $50 million Series B round at a $750 million valuation from a group of prominent investors, the company announced on Wednesday.

The round was co-led by Antonio Gracias of Valar Equity Partners, best known for its investments in Elon Musk’s companies, particularly SpaceX, and Gavin Baker of Atreides Management, a hedge fund that has also backed Musk’s companies as well as AI chipmaker Cerebras. Sequoia Capital, which led Flow’s Series A round last October, also participated, as did former Sequoia partner Roelof Botha, who invested as an individual and has joined Flow’s board.

Three-year-old, San Francisco-based Flow is tackling the difficulties of hardware design with AI agents that automatically align CAD drawings with product requirements, simulation results, and other testing.

The company counts Anduril, Rivian, Joby Aviation, General Motors PPU (a joint venture between General Motors and TWG Motorsports), RV Tech (a joint venture between Rivian and Volkswagen), and Stoke Space, among others, as customers.

Why it matters

The round signals continued investor appetite for AI tools aimed at physical-world engineering — hardware, aerospace, and automotive design — rather than just software, with backers who have profited from betting on Musk’s ventures now betting on the tooling layer underneath them.