Ultra Clean Holdings launches $400M ATM equity offering program

Ultra Clean Holdings, Inc.

Entered sales agreement with UBS, Barclays, Craig-Hallum, and Oppenheimer for at-the-market sales of up to $400M common stock.
Sales agents earn commission up to 3.0% of gross proceeds; company reimburses specified expenses.
Company controls timing and size; no obligation to sell, may suspend or terminate at any time.
Offered under existing shelf registration (333-278195) with prospectus supplement dated Aug 14, 2026.

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