Exhibit __99.1
Press Release	Source: Ultra Clean Holdings, Inc.

Ultra Clean Reports Third Quarter 2010 Financial Results

Monday, October 25, 2010 4:15 pm EDT

Company Reports Record Revenue and Earnings for Third Quarter

HAYWARD, Calif., October 25, 2010 /PRNewswire/ -- Ultra Clean Holdings, Inc. (Nasdaq: UCTT), a leading developer and supplier of critical subsystems for the semiconductor capital equipment, flat panel, medical, energy and research industries, today reported its financial results for the third quarter of fiscal year 2010 ended October 1, 2010.  Revenue for the third quarter was $118.5 million, an increase of 12% from the second quarter 2010 and an increase of 186.7% from the same period a year ago.  Gross margin for the third quarter was 14.5%, compared to 14.0% for the second quarter 2010 and 7.9% for the same period a year ago. The company recorded net income of $6.7 million, or $0.29 per share, compared to net income of $5.7 million, or $0.25 per share, for the second quarter 2010 and a net loss of $1.4 million, or $(0.07) per share, for the third quarter of 2009.

Cash at the end of the third quarter 2010 was $27.7 million, an increase of $4.6 million from the prior quarter.  Net inventory was $64.0 million, an increase of $8.9 million, compared to $55.1 million at the end of the second quarter.

Clarence Granger, Ultra Clean’s Chairman and Chief Executive Officer stated: “In the third quarter of 2010 UCT performed well, setting all-time records in revenue and earnings per share and improving our gross margins from the second quarter.  This was a very challenging quarter for us operationally and we were able to support our customers, meeting all of their requirements.  Moving ahead to the fourth quarter we anticipate a slight decline in overall demand, partially offset by continued progress in penetrating the HB-LED market”.

Commenting on Ultra Clean’s corporate guidance, Granger noted: “Revenue guidance for the fourth quarter is $110 million to $115 million, with earnings per share in the range of $0.20 to $0.24.  Our projected earnings for the quarter include one-time employment related charges of $0.4 million.  Excluding these one-time charges, adjusted earnings per share guidance for the fourth quarter is in the range of $0.22 to $0.26.”

Ultra Clean will conduct a conference call today, Monday, October 25, 2010, beginning at 1:45 p.m. PDT at 888-561-5097 (domestic) and 706-679-7569 (international). A replay of the webcast will be available for fourteen days following the conference call at 800-642-1687 (domestic) and 706-645-9291 (international). The confirmation number for the live broadcast and replay is 11489753 (all callers). The conference call will also be webcast live and be available for fourteen days on our website.

About Ultra Clean Holdings, Inc.

Ultra Clean Holdings, Inc. is a leading developer and supplier of critical subsystems for the semiconductor capital equipment, flat panel, medical, energy and research industries. Ultra Clean offers its customers an integrated outsourced solution for gas delivery systems and other subassemblies, improved design-to-delivery cycle times, component neutral design and manufacturing and component testing capabilities. Ultra Clean's customers are primarily original equipment manufacturers for the semiconductor capital equipment, flat panel, medical, energy and research industries. Ultra Clean is headquartered in Hayward, California. Additional information is available at www.uct.com.

Safe Harbor Statement

The foregoing information contains, or may be deemed to contain, "forward- looking statements" (as defined in the US Private Securities Litigation Reform Act of 1995) which reflect our current views with respect to future events and financial performance. We use words such as "anticipates," "believes," "plan," "expect," "future,"' "intends," "may," "will," "should," "estimates," "predicts," "potential," "continue" and similar expressions to

identify these forward-looking statements. Forward looking statements included in the press release include estimates made with respect to our third quarter 2010 revenue and earnings per share. All forward-looking statements address matters that involve risks and uncertainties. Accordingly, our actual results may differ materially from the results predicted or implied by these forward- looking statements. These risks, uncertainties and other factors include, among others, those identified in "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations'' and elsewhere in our annual report on Form 10-K for the year ended January 1, 2010 and quarterly report on Form 10-Q for the quarter ended July 2, 2010, filed with the Securities and Exchange Commission. Ultra Clean Holdings, Inc. undertakes no obligation to publicly update or review any forward-looking statements, whether as a result of new information future developments or otherwise.

Contact:

Ultra Clean Holdings, Inc.

Casey Eichler

CFO

510/576-4704

Ultra Clean Holdings, Inc

Condensed Consolidated Statements of Operations

(Unaudited; in thousands, except per share data)

	For the three months ended						For the nine months ended
	October 1, 2010			October 2, 2009			October 1, 2010			October 2, 2009
Sales	$	118,486		$	41,324		$	322,831		$	86,976
Cost of goods sold		101,285			38,041			278,461			87,417
Gross profit (loss)		17,201			3,283			44,370			(441	)
Operating expenses:
Research and development		1,455			771			3,951			2,435
Sales and marketing		1,861			1,027			4,923			3,222
General and administrative		5,359			3,250			15,781			12,109
Total operating expenses		8,675			5,048			24,655			17,766
Income (loss) from operations		8,526			(1,765	)		19,715			(18,207	)
Interest and other income (expense), net		(237	)		(189	)		(534	)		(612	)
Income (loss) before income taxes		8,289			(1,954	)		19,181			(18,819	)
Income tax provision (benefit)		1,592			(536	)		2,980			3,702
Net income (loss)	$	6,697		$	(1,418	)	$	16,201		$	(22,521	)
Net income (loss) per share:
Basic	$	0.31		$	(0.07	)	$	0.75		$	(1.05	)
Diluted		0.29		$	(0.07	)	$	0.71		$	(1.05	)
Shares used in computing net income (loss) per share:
Basic		21,891			21,419			21,702			21,363
Diluted		23,060			21,419			22,930			21,363

Ultra Clean Holdings, Inc

Condensed Consolidated Balance Sheets

(Unaudited; in thousands)

	October 1,			January 1,
ASSETS	2010			2010
Current assets:
Cash and cash equivalents	$	27,728		$	26,697
Accounts receivable		46,554			34,787
Inventory		64,041			46,976
Other current assets		4,017			6,005
Total current assets		142,340			114,465
Equipment and leasehold improvements, net		8,333			7,450
Purchased intangibles, net		8,987			8,987
Other non-current assets		366			408
Total assets	$	160,026		$	131,310
LIABILITIES & STOCKHOLDERS' EQUITY
Current liabilities
Bank borrowings	$	1,702		$	2,008
Accounts payable		51,094			46,098
Other current liabilities		6,072			4,948
Total current liabilities		58,868			53,054
Bank debt and other long-term liabilities		19,322			17,077
Total liabilities		78,190			70,131
Stockholders' equity
Common stock		97,682			93,226
Accumulated deficit		(15,846	)		(32,047	)
Total stockholders' equity		81,836			61,179
Total liabilities and stockholders' equity	$	160,026		$	131,310