# Fab2

> Fab2, formerly Atomic Semi, builds semiconductor fabrication tools, components and software, with the ambition of mass-producing compact chip fabs in a factory of fabs. Founded by Sam Zeloof and Jim Keller, the Austin-based company also develops Studio, a collaborative browser-based chip-design tool, and announced a $500 million Series A in September 2026.

- **Founded:** 2023
- **Headquarters:** Austin, United States
- **Founders:** Sam Zeloof (Co-founder, President and CEO), Jim Keller (Co-founder and Director)
- **Products:** Fab fab, Semiconductor tools and components, Studio
- **Notable:** Announced a US$500 million Series A at a US$3.7 billion valuation in September 2026., Established a three-site footprint spanning Austin, Lockhart and San Francisco., Developing fabrication equipment and browser-based collaborative EDA within the same company.

## Products & services

- **Fab fab** — Factory-building program that assembles in-house components into machines and machines into compact semiconductor fabs; mass replication is an ambition, not a verified shipment count.
- **Semiconductor tools and components** — In-house fabrication equipment and supporting components, including pumps, valves, sensors, precision actuators, gas lines and vacuum chambers. Public pricing is not established.
- **Studio** — A browser-based collaborative electronic design automation tool for layout, schematics and simulation, previously called Atomic Studio. Public commercial availability and pricing are not established.

## Achievements

- Announced a US$500 million Series A at a US$3.7 billion valuation in September 2026.
- Established a three-site footprint spanning Austin, Lockhart and San Francisco.
- Developing fabrication equipment and browser-based collaborative EDA within the same company.
- Co-founder Sam Zeloof documented home-fabricated integrated circuits in 2018 and a 1,200-transistor silicon piece in 2021, before the company.

## Latest updates

- **2026-07** — Atomic Semi publicly rebranded as Fab2; July coverage described its Texas expansion and fab-fab strategy.
- **2026-09** — Company announced a US$500 million Series A at a US$3.7 billion valuation, led by Fundomo.
- **2026-09** — September 8 SEC Form D recorded US$556,021,222 sold, including US$88 million from conversion of securities; this is not an additional funding round on top of the announced Series A.

## Links

- Website: https://fab2.com/
- LinkedIn: https://www.linkedin.com/company/fabtwo
- Twitter/X: https://x.com/fab2
- YouTube: https://www.youtube.com/@fab-two

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Profile page: https://yespress.io/fab2
Published by YesPress — https://yespress.io
Last updated: 2026-10-03