UCTT · Ultra Clean Holdings, Inc.

Hear from UCT’s very own Cheryl Knepfler, VP of Marketing, on the value of SEMI in connecting the semiconductor ecosystem and delivering actionable industry insights!

One of the clearest signals coming out of recent High NA EUV discussions is this: contamination control is no longer a secondary concern; it’s an economic one. As highlighted by EE Times , molecular species once considered manageable can actually absorb onto reflective EUV surfaces, subtly altering dose and contributing to defect formation over time. With High NA EUV, tighter imaging margins and higher photon flux leave far less room for that kind of drift. What used to be minor contamination now scales quickly into real risk for uptime and yield. What’s changing isn’t just the technology, it’s mindset. High NA EUV is accelerating a shift from reactive cleaning to specification-driven, measurement-based contamination control. Instead of asking, “How do we clean this after the fact?” the industry is now asking, “How do we prevent it from entering the system at all?” That shift is driving a greater focus on: Trace-level organics and metals characterization Airborne molecular

Ultra Clean Holdings, Inc. (Nasdaq: UCTT), today announced its participation at the 28 th Annual Needham Growth Conference in New York on January 13 and 14, 2026. UCT will host 1-on-1 meetings and will also participate in a Fireside Chat that can be viewed live via webcast on Tuesday January 13, 2026 at 12:45 pm Eastern time. The live webcast and replay of the webcast can be found here https://www.uct.com/investors/events-and-presentations/default.aspx About Ultra Clean Holdings, Inc. Ultra Clean Holdings, Inc. is a leading developer and supplier of critical subsystems, components, parts, and ultra-high purity cleaning and analytical services, primarily for the semiconductor industry. Under its Products division, UCT offers its customers an integrated outsourced solution for major subassemblies, improved design-to-delivery cycle times, design for manufacturability, prototyping, and high-precision manufacturing. Under its Services Division, UCT offers its customers tool chamber parts