Ultra Clean Holdings, Inc. UCTT

What this company does

Ultra Clean Holdings, Inc. develops and supplies critical subsystems, components, parts, and ultra-high purity cleaning and analytical services primarily for the semiconductor industry. In addition to its United States manufacturing and service operations, the company manufactures products and provides parts cleaning and other related services from facilities in Asia Pacific, Europe and the Middle East to support local and U.S.-based customers. As of December 26, 2025, the company had 7,411 employees, of which 463 were temporary. Applied Materials, Inc. and Lam Research Corporation were the company's two largest revenue customers in fiscal years 2025, 2024 and 2023, each accounting for more than 10% of total revenues in those years. The company reports results for two segments, Products and Services. The Products segment designs, engineers and manufactures production tools, components and parts, and modules and subsystems for the semiconductor and display capital equipment markets, including chemical delivery modules, frame assemblies, gas delivery systems, fluid delivery systems, precision robotics, process modules and other high-level assemblies. The Services segment provides ultra-high purity parts cleaning, process tool part recoating, surface encapsulation and high sensitivity micro contamination analysis primarily for semiconductor device makers and wafer fabrication equipment markets.

Written from the business description in Ultra Clean Holdings, Inc.'s annual report to the U.S. Securities and Exchange Commission, filed 23 February 2026. Every sentence was checked against that document before publication.