Business Description

Overview Ultra Clean Holdings, Inc., (“UCT”, the “Company” or “We”) is a leading developer and supplier of critical subsystems, components, parts, and ultra-high purity cleaning and analytical services primarily for the semiconductor industry. UCT offers its customers an integrated outsourced solution for major subassemblies, improved design-to-delivery cycle times, design for manufacturability, prototyping and part and component manufacturing, as well as tool chamber parts cleaning and coating, and micro-contamination analytical services. We report results for two segments: Products and Services. Our Products segment primarily designs, engineers and manufactures production tools, components and parts, and modules and subsystems for the semiconductor and display capital equipment markets. Products include chemical delivery modules, frame assemblies, gas delivery systems, fluid delivery systems, precision robotics, process modules as well as other high-level assemblies. Our Services segment provides ultra-high purity parts cleaning, process tool part recoating, surface encapsulation and high sensitivity micro contamination analysis primarily for the semiconductor device makers and wafer fabrication equipment (“WFE”) markets. We ship a majority of our products and provide most of our services to U.S.-registered customers with both domestic and international locations. In addition to U.S. manufacturing and service operations, we manufacture products and provide parts cleaning and other related services in our Asia Pacific (“APAC”), Europe and Middle East (“EMEA”) facilities to support local and U.S.-based customers. We conduct our operating activities primarily through our subsidiaries. Over the long-term, we believe the semiconductor market we serve will continue to grow due to multi-year industry demand from a broad range of drivers, such as new device architecture (e.g. gate all around and backside power distribution), memory devices (e.g. high bandwidth memory) necessary for cloud, artificial intelligence (“AI”) and machine learning (“ML”) applications, and advanced packaging. We also believe that semiconductor original equipment manufacturers (“OEM”) are increasingly relying on partners like UCT to fulfill their expanding capacity requirements. Additionally, our Services business is benefiting as device manufacturers rely on precision cleaning and coating to produce ever more advanced devices. Our international revenues represented 75.9%, 73.0% and 69.6% of total revenues for fiscal years ended 2025, 2024 and 2023, respectively. See Note 12 of Notes to Consolidated Financial Statements for further information about our geographic revenues. Our Suite of Offerings We are a leading developer and supplier of critical subsystems, parts, components and ultra-high purity cleaning and analytical services primarily for the semiconductor industry. We offer our customers an integrated outsourced solution for major subassemblies, improved design-to-delivery cycle times, design for manufacturability, prototyping and component manufacturing, tool chamber parts cleaning and coating and micro contamination analytical services. Our leadership in the market is enabled by the following customer-centric solutions: • A vertically integrated solution for complex and highly configurable systems . We provide our customers a broad outsourced solution for the development, design, component sourcing and cleaning, prototyping, engineering, and manufacturing and testing of advanced systems. We utilize our weldment and frame 3 Table of Contents fabrication capabilities together with highly specialized engineering, global supply chain management, and assembly capabilities to produce high performance products that are customized to meet the needs of equipment suppliers and chipmakers. We enable our customers to minimize their overall number of suppliers, simplify their supply chain and reduce their inventories. • Parts and components. We offer our customers a wide range of gas delivery solutions such as precision thermal products, ultra-clean valves, high purity connectors, industrial process connectors and valves, pneumatic actuators, manifolds and safety solutions, hoses, pressure gauges, gas line and component heaters, as well as complex weldments.…