EXHIBIT 32.1
ULTRA CLEAN HOLDINGS, INC.
SARBANES-OXLEY ACT SECTION 906 CERTIFICATION
The certification set forth below is being submitted in connection with the annual report on Form 10-K of Ultra Clean Holdings, Inc. for the year ended December 31, 2004 (the “Report”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United Code.
| 1. | the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and | |||
| 2. | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Ultra Clean Holdings, Inc. | |||
Date: March 30, 2005
| /s/ Clarence L. Granger | ||||
| Clarence L. Granger | ||||
| Chief Executive Officer |