Atomic Machines builds the Matter Compiler, an AI-native, all-digital manufacturing system that builds working micro-machines directly from code, with no molds, masks or fixtures. Its machines have moving parts, multiple materials and features down to single-digit microns, and every operation is measured so the system learns with each build. After six years in stealth, the company emerged in October 2026 with $250M in funding and unveiled its first product, PrimeSwitch, a fast electromechanical power relay for 800-volt DC power in AI data centers. Atomic Machines is based in Emeryville, California, and led by founder and CEO Jeff Holden, Amazon's tenth engineer and Uber's former Chief Product Officer.