Atomic Machines spent six years in stealth building a compiler for micro-machines

Builds micro-scale machines — gears the size of a sand grain, robots small enough for the body, AI-chip cooling — with its Matter Compiler system.

Manufacturing can work like software: a 'Matter Compiler' turns code alone into working micro-machines with moving parts, no tooling.

$250M raised across rounds from OneIM, Gigafund, XTX Ventures, KAS Venture Partners, Valor Equity Partners, Sozo Ventures and the Regents of the University of California; valuation undisclosed.

Jeff Holden — Amazon's tenth engineer, builder of Amazon Prime and later Uber's first chief product officer — founded the company and kept it in stealth for six years.

The system measures and corrects every step in real time and its AI runs its own experiments on the hardware; machines come out with moving parts, several materials and features down to single-digit microns, with no moulds, masks or fixed tooling.

MEMS tooling takes years of custom process work per device; a compiler that skips tooling collapses that cycle.

AI data centres moving to 800V DC need protection faster than mechanical switches offer — a 50-microsecond open is a buy, not a build.

The founder bet matters as much as the tech: Holden's record is compounding platform bets (Prime, Uber's autonomous stack) behind long quiet builds.

Six silent years compiling machines from code only pays if the first product rides a market that desperately needs what only the new machine can make.

As of 7 October 2026, PrimeSwitch PS-150 units were in early-access evaluation with unnamed customers, the public unveiling was set for the OCP Global Summit on 12-15 October, and the company had not disclosed its valuation or how the $250M split across rounds.