Fab2 Raises $556M Series A Led by Fundomo to Mass-Produce Chip Fabs

Fab2 Lands $556M Series A to Scale "Fab Fab" and Software-Defined Chip Manufacturing

Fab2, formerly Atomic Semi, has raised $556 million in Series A funding. The round was led by Fundomo, with participation from Duquesne Family Office, Naval Ravikant, StepStone Group, Protagonist, Maverick Silicon, Paradigm, Corner Capital, and UDC. The funding date is September 8, 2026.

What Fab2 Does

Fab2 is a semiconductor manufacturing startup building a "fab fab" — a factory that mass-produces small, software-defined chip fabs and every tool inside them, from pumps, valves, and vacuum chambers to lithography. The company pairs this hardware with its in-browser collaborative Studio EDA.

Founded in 2022 by chip architect Jim Keller and DIY chipmaker Sam Zeloof, Fab2 operates a chip fab in Austin and a fab fab in Lockhart, Texas, plus the original garage fab in San Francisco. The company targets hour-scale chip prototyping rather than high-volume wafer production.

Funding Details

• Round type: Series A
• Amount raised: $556,000,000 USD
• Lead investor: Fundomo
• Additional investors: Duquesne Family Office, Naval Ravikant, StepStone Group, Protagonist, Maverick Silicon, Paradigm, Corner Capital, UDC
• Funding date: September 8, 2026

Why This Matters for Acquirers

Fab2 is attacking a critical bottleneck in semiconductor innovation: the cost and time required to build and equip chip fabs. By mass-producing small, software-defined fabs and their internal tools, Fab2 aims to make chip prototyping faster and more accessible. This approach could lower barriers for startups, research institutions, and established companies seeking to iterate on chip designs without committing to high-volume production.

The involvement of high-profile investors like Naval Ravikant and Duquesne Family Office, alongside lead Fundomo, underscores the strategic importance of domestic semiconductor manufacturing and prototyping capabilities.

Acquisition Angle

For acquirers in semiconductors, industrial automation, or EDA software, Fab2 presents a unique asset: a vertically integrated approach to fab construction and operation, combined with a collaborative design environment. The company's focus on hour-scale prototyping could complement existing foundry or design tool portfolios.

With $556 million in fresh capital, Fab2 is well-positioned to expand its manufacturing capacity and further develop its Studio EDA platform. The presence of a diverse investor syndicate may also signal interest from strategic players eyeing the future of agile chip production.

Outlook

Fab2, formerly Atomic Semi, has raised a substantial Series A to scale its "fab fab" concept and software-defined manufacturing tools. As the company executes on its vision, it could become a key player in the shift toward faster, more flexible chip prototyping. For acquirers, Fab2 offers a rare combination of hardware and software assets in a segment poised for growth.