Exhibit 99.1 Press Release Source: Ultra Clean Holdings, Inc. Ultra Clean Reports Third Quarter 2024 Financial Results HAYWARD, Calif., October 28, 2024 /PRNewswire/ Ultra Clean Holdings, Inc. (Nasdaq: UCTT), today reported its financial results for the third quarter ended September 27, 2024. "UCT's third quarter results came in above expectations driven by broader equipment demand for AI infrastructure build out and sustained domestic China market spending," said Jim Scholhamer, CEO. "The rationale for sig ...