Ultra Clean Holdings, Inc. (UCTT)

About Ultra Clean Holdings, Inc.

Ultra Clean Holdings, Inc. develops and supplies critical subsystems, components and parts, and cleaning and analytical services for the semiconductor industry in the United States and internationally. The company offers outsourced solutions for the development, design, component sourcing and cleaning, prototyping, engineering, and manufacturing and testing of advanced systems. It also provides a range of gas delivery solutions, such as precision thermal products, valves, connectors, industrial process connectors and valves, pneumatic actuators, manifolds and safety solutions, hoses, pressure gauges, gas lines, and component heaters, as well as complex weldments. In addition, the company offers assemblies, including gas and fluid delivery solutions, wafer transport systems, mechatronic assemblies, process modules, and sub-fab process equipment support racks; weldments and frames with exacting standards; heaters, sensors, and controllers for precise temperature control; integrated device manufacturers and OEMs validated process tool chamber parts cleaning and coating services; and tool part process optimization solutions, analytical verification of process tool chamber part cleaning effectiveness and micro contamination analysis of tool parts, wafers and depositions, chemicals, cleanroom materials, deionized water, and airborne molecular contamination. It primarily serves customers in the semiconductor capital equipment and semiconductor integrated device manufacturing industries, as well as display, consumer, medical, energy, industrial, and research equipment industries. The company was founded in 1991 and is headquartered in Hayward, California.

Company profile, industry and headcount are as reported by our data provider and can lag a company's own filings by a reporting period. The annual report is the authority.

Super investor ownership

11 of the funds we track reported a position in their latest SEC 13F filing. Largest first:

• D. E. Shaw, D. E. Shaw & Co., Inc.$88.38M · 0.0% of book
• Two Sigma, TWO SIGMA INVESTMENTS, LP$86.96M · 0.1% of book
• Israel Englander, MILLENNIUM MANAGEMENT LLC$55.35M · 0.0% of book
• First Eagle, First Eagle Investment Management, LLC$49.61M · 0.1% of book
• Cliff Asness, AQR CAPITAL MANAGEMENT LLC$29.97M · 0.0% of book

A word of warning on reading these figures: a 13F reports the market value of a holding, so a fund that traded nothing at all still appears to have sold when the price fell. We found 102 companies where the standard reading gives the opposite answer. Only the share count is honest.

Politician trades in UCTT

Trades in UCTT disclosed by members of Congress and executive-branch officials, latest first:

• Donald J Trump · Executive branchSell · $50,001 - $100,000 · traded 15 May 2026 · disclosed 1 Jul 2026
• Donald J Trump · Executive branchSell · $15,001 - $50,000 · traded 29 Jul 2024 · disclosed 22 Sept 2026
• Donald J Trump · Executive branchSell · $15,001 - $50,000 · traded 8 Jul 2024 · disclosed 22 Sept 2026
• Donald J Trump · Executive branchBuy · $15,001 - $50,000 · traded 22 Jun 2024 · disclosed 22 Aug 2026
• Donald J Trump · Executive branchBuy · $15,001 - $50,000 · traded 4 Jun 2024 · disclosed 22 Aug 2026

A disclosure reports a value band, not an amount, and is due up to 45 days after the trade; some arrive later. Every filer we track, each with their own page, is on the Congress trading tracker.

Common questions