Item 8.01. Other Events.

On August 29, 2006, each of Clarence L. Granger, Chief Executive Officer, and Bruce Wier, Vice President of Engineering, of Ultra Clean Holdings, Inc. (the “Company”) entered into a Rule 10b5-1 trading plan (each a “Plan” and collectively, the “Plans”) with a broker to sell ordinary shares of the Company that are owned or will be acquired on the exercise of their respective employee stock options. The Plans specify the number of ordinary shares that may be sold at predetermined times, subject to the terms and conditions of the Plans.

Each person entered into a Plan as part of his personal long-term investment strategy for asset diversification and liquidity and will have no further control over the timing of the sales of ordinary shares under such person’s Plan. The Plans specify the number of ordinary shares that may be sold periodically at various pre-determined prices (“limit orders”). Most of the ordinary shares sold pursuant to the Plans will come from the exercise of options. Such options have various strike prices and such sales will be executed as same-day sales.

Pursuant to the Plan entered into by Mr. Granger, a maximum of 298,157 ordinary shares may be sold based on limit orders over a three-year period starting January 1, 2007. Pursuant to the Plan entered into by Mr. Wier, a maximum of 21,000 ordinary shares may be sold based on limit orders beginning October 1, 2006 until the Plan terminates August 29, 2007.

The Plans are intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, and the Company’s insider trading policy. Rule 10b5-1 allows corporate insiders to establish pre-arranged written stock trading plans at a time when the insider is not aware of material, non-public information. Subsequent receipt by the insider of material, non-public information will not prevent pre-arranged transactions under the Rule 10b5-1 plan from being executed.