Ultra Clean Holdings, Inc. engages in the development and supplying of critical subsystems, components and parts, and ultra-high purity cleaning and analytical services for the semiconductor industry. It operates through the Products and Services segments. The Products segment is involved in the design and manufacture of production tools, components, parts, and modules, and subsystems for the semiconductor and display capital equipment industry. The Services segment provides purity parts cleaning, process tool part recoating, surface encapsulation, and high sensitivity micro contamination analysis for the semiconductor device makers and wafer fabrication equipment. The company was founded in November 2002 and is headquartered in Hayward, CA.