Income Statement Continuing Operations –

Non-GAAP

Q1

Q2

Q3

Q4

Q1

Q2

Sales

$156,406

$179,296

$169,880

$167,300

$159,571

$153,508

Gross Margin

75,275

86,644

75,889

69,774

68,949

65,480

GM%

48.1%

48.3%

44.7%

41.7%

43.2%

42.7%

Operating Income

25,249

34,506

28,674

23,890

18,517

16,097

% of Sales

16.1%

19.2%

16.9%

14.3%

11.6%

10.5%

EPS

$0.13

$0.18

$0.16

$0.16

$0.11

$0.11

FY2006

FY2007

•

Reflects non-GAAP results for continuing operations, adjusted for merger-related and other restructuring charges,

amortization expense, integration expense, and integration-related stock-based compensation as well as a one-

time gain from sale of an equity investment in Q2-07.

•

A reconciliation of GAAP to non-GAAP results is provided in the following pages.

In $ thousands, except per share data

Exhibit 99.1

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended April 1, 2006

(Unaudited)

(In thousands, except per share data)	As previously reported		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP		Less Adjustments to GAAP		Non-GAAP
Net sales	157,662		1,256		156,406		—		156,406
Cost of sales	84,703		1,124		83,579		2,448		81,131
Gross profit	72,959		132		72,827		(2,448	)	75,275
Selling, general and administrative expenses	52,068		371		51,697		10,713		40,984
Engineering, research and development expenses	9,176		134		9,042				9,042
Operating profit (loss)	11,715		(373	)	12,088		(13,161	)	25,249
Interest income, net	2,023		—		2,023				2,023
Other income (expense), net	795		—		795				795
Income (loss) before income taxes and equity in (earnings) loss of affiliates	14,533		(373	)	14,906		(13,161	)	28,067
Income tax expense (benefit)	4,796		(140	)	4,936		(4,346	)	9,282
Equity in net (earnings) loss of affiliates	(36	)	—		(36	)			(36	)
Income (loss) from continuing operations	9,773		(233	)	10,006		(8,815	)	18,821
Income (loss) from operations of discontinued businesses, net of taxes	1,580		233		1,347				1,347
Impairment loss on assets of discontinued businesses, net of taxes	—		—		—				—
Income (loss) from discontinued operations, net of taxes	1,580		233		1,347		—		1,347
Net income (loss)	11,353		—		11,353		(8,815	)	20,168
Basic earnings (loss) per common share:
Continuing operations	0.07		(0.00	)	0.07		(0.06	)	0.14
Discontinued operations	0.01		0.00		0.01		—		0.01
Net income (loss)	0.08		—		0.08		(0.06	)	0.15
Diluted earnings (loss) per common share:
Continuing operations	0.07		(0.00	)	0.07		(0.06	)	0.13
Discontinued operations	0.01		0.00		0.01		—		0.01
Net income (loss)	0.08		—		0.08		(0.06	)	0.14
Weighted shares outstanding
Basic	136,889		136,889		136,889		136,889		136,889
Diluted	140,402		140,402		140,402		140,402		140,402

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended July 1, 2006

(Unaudited)

(In thousands, except per share data)	As previously reported		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP		Less Adjustments to GAAP		Non-GAAP
Net sales	180,701		1,405		179,296		—		179,296
Cost of sales	93,594		1,279		92,315		(337	)	92,652
Gross profit	87,107		126		86,981		337		86,644
Selling, general and administrative expenses	51,977		424		51,553		9,392		42,161
Engineering, research and development expenses	10,219		242		9,977				9,977
Operating profit (loss)	24,911		(540	)	25,451		(9,055	)	34,506
Interest income, net	1,897		—		1,897				1,897
Other income (expense), net	799		—		799				799
Income (loss) before income taxes and equity in (earnings) loss of affiliates	27,607		(540	)	28,147		(9,055	)	37,202
Income tax expense (benefit)	9,321		(203	)	9,524		(3,100	)	12,624
Equity in net (earnings) loss of affiliates	(159	)	—		(159	)			(159	)
Income (loss) from continuing operations	18,445		(337	)	18,782		(5,955	)	24,737
Income (loss) from operations of discontinued businesses, net of taxes	(252	)	337		(589	)			(589	)
Impairment loss on assets of discontinued businesses, net of taxes	—		—		—				—
Income (loss) from discontinued operations, net of taxes	(252	)	337		(589	)	—		(589	)
Net income (loss)	18,193		—		18,193		(5,955	)	24,148
Basic earnings (loss) per common share:
Continuing operations	0.13		(0.00	)	0.14		(0.04	)	0.18
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.13		—		0.13		(0.04	)	0.18
Diluted earnings (loss) per common share:
Continuing operations	0.13		(0.00	)	0.13		(0.04	)	0.18
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.13		—		0.13		(0.04	)	0.17
Weighted shares outstanding
Basic	137,445		137,445		137,445		137,445		137,445
Diluted	140,621		140,621		140,621		140,621		140,621

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended September 30, 2006

(Unaudited)

(In thousands, except per share data)	As previously reported		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP		Less Adjustments to GAAP		Non-GAAP
Net sales	171,262		1,382		169,880		—		169,880
Cost of sales	95,000		958		94,042		51		93,991
Gross profit	76,262		424		75,838		(51	)	75,889
Selling, general and administrative expenses	43,672		388		43,284		5,720		37,564
Engineering, research and development expenses	9,840		189		9,651				9,651
Operating profit (loss)	22,750		(153	)	22,903		(5,771	)	28,674
Interest income, net	2,846		—		2,846				2,846
Other income (expense), net	702		—		702				702
Income (loss) before income taxes and equity in (earnings) loss of affiliates	26,298		(153	)	26,451		(5,771	)	32,222
Income tax expense (benefit)	8,468		(58	)	8,526		(1,794	)	10,320
Equity in net (earnings) loss of affiliates	(93	)	—		(93	)			(93	)
Income (loss) from continuing operations	17,923		(95	)	18,018		(3,977	)	21,995
Income (loss) from operations of discontinued businesses, net of taxes	(102	)	95		(197	)			(197	)
Impairment loss on assets of discontinued businesses, net of taxes	—		—		—				—
Income (loss) from discontinued operations, net of taxes	(102	)	95		(197	)	—		(197	)
Net income (loss)	17,821		—		17,821		(3,977	)	21,798
Basic earnings (loss) per common share:
Continuing operations	0.13		(0.00	)	0.13		(0.03	)	0.16
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.13		—		0.13		(0.03	)	0.16
Diluted earnings (loss) per common share:
Continuing operations	0.13		(0.00	)	0.13		(0.03	)	0.16
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.13		—		0.13		(0.03	)	0.16
Weighted shares outstanding
Basic	135,538		135,538		135,538		135,538		135,538
Diluted	138,921		138,921		138,921		138,921		138,921

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended December 31, 2006

(Unaudited)

(In thousands, except per share data)	As previously reported		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP		Less Adjustments to GAAP		Non-GAAP
Net sales	169,081		1,781		167,300		—		167,300
Cost of sales	99,260		1,392		97,868		342		97,526
Gross profit	69,821		389		69,432		(342	)	69,774
Selling, general and administrative expenses	42,055		278		41,777		5,297		36,480
Engineering, research and development expenses	9,595		191		9,404				9,404
Operating profit (loss)	18,171		(80	)	18,251		(5,639	)	23,890
Interest income, net	2,439		—		2,439				2,439
Other income (expense), net	(638	)	—		(638	)			(638	)
Income (loss) before income taxes and equity in (earnings) loss of affiliates	19,972		(80	)	20,052		(5,639	)	25,691
Income tax expense (benefit)	3,920		(30	)	3,950		(851	)	4,801
Equity in net (earnings) loss of affiliates	(243	)	—		(243	)			(243	)
Income (loss) from continuing operations	16,295		(50	)	16,345		(4,788	)	21,133
Income (loss) from operations of discontinued businesses, net of taxes	(196	)	50		(246	)			(246	)
Impairment loss on assets of discontinued businesses, net of taxes	—		—		—				—
Income (loss) from discontinued operations, net of taxes	(196	)	50		(246	)	—		(246	)
Net income (loss)	16,099		—		16,099		(4,788	)	20,887
Basic earnings (loss) per common share:
Continuing operations	0.12		(0.00	)	0.13		(0.04	)	0.16
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.12		—		0.12		(0.04	)	0.16
Diluted earnings (loss) per common share:
Continuing operations	0.12		(0.00	)	0.12		(0.04	)	0.16
Discontinued operations	(0.00	)	0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.12		—		0.12		(0.04	)	0.16
Weighted shares outstanding
Basic	130,594		130,594		130,594		130,594		130,594
Diluted	134,024		134,024		134,024		134,024		134,024

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended March 31, 2007

(Unaudited)

(In thousands, except per share data)	As previously reported		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP		Less Adjustments to GAAP		Non-GAAP
Net sales	161,076		1,505		159,571		—		159,571
Cost of sales	92,277		1,213		91,064		442		90,622
Gross profit	68,799		292		68,507		(442	)	68,949
Selling, general and administrative expenses	46,194		250		45,944		6,046		39,898
Engineering, research and development expenses	10,754		220		10,534				10,534
Operating profit (loss)	11,851		(178	)	12,029		(6,488	)	18,517
Interest income, net	2,818		—		2,818				2,818
Other income (expense), net	(25	)	—		(25	)			(25	)
Income (loss) before income taxes and equity in (earnings) loss of affiliates	14,644		(178	)	14,822		(6,488	)	21,310
Income tax expense (benefit)	4,286		(57	)	4,343		(2,076	)	6,419
Equity in net (earnings) loss of affiliates	(25	)	—		(25	)			(25	)
Income (loss) from continuing operations	10,383		(121	)	10,504		(4,412	)	14,916
Income (loss) from operations of discontinued businesses, net of taxes	—		121		(121	)			(121	)
Impairment loss on assets of discontinued businesses, net of taxes	—		—		—				—
Income (loss) from discontinued operations, net of taxes	—		121		(121	)	—		(121	)
Net income (loss)	10,383		—		10,383		(4,412	)	14,795
Basic earnings (loss) per common share:
Continuing operations	0.08		(0.00	)	0.08		(0.03	)	0.11
Discontinued operations	—		0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.08		—		0.08		(0.03	)	0.11
Diluted earnings (loss) per common share:
Continuing operations	0.08		(0.00	)	0.08		(0.03	)	0.11
Discontinued operations	—		0.00		(0.00	)	—		(0.00	)
Net income (loss)	0.08		—		0.08		(0.03	)	0.11
Weighted shares outstanding
Basic	132,194		132,194		132,194		132,194		132,194
Diluted	135,233		135,233		135,233		135,233		135,233

Entegris, Inc.

GAAP to Non-GAAP Reconciliation of

Statement of Operations

For the Three Months Ended June 30, 2007

(Unaudited)

(In thousands, except per share data)	U.S. GAAP Before Reflecting Cleaning Equipment as Discontinued Operations		Reclass Cleaning Equipment as Discontinued Operations		U.S. GAAP as reported		Less Adjustments to GAAP		Non-GAAP
Net sales	155,533		2,025		153,508		—		153,508
Cost of sales	89,551		1,537		88,014		(15	)	88,029
Gross profit	65,982		488		65,494		15		65,479
Selling, general and administrative expenses	46,982		2,665		44,317		4,614		39,703
Engineering, research and development expenses	9,932		253		9,679				9,679
Operating profit (loss)	9,068		(2,430	)	11,498		(4,599	)	16,097
Interest income, net	2,559		—		2,559				2,559
Other income (expense), net	6,074		—		6,074		6,068		6
Income (loss) before income taxes and equity in (earnings) loss of affiliates	17,701		(2,430	)	20,131		1,469		18,662
Income tax expense (benefit)	3,004		(1,457	)	4,461		810		3,651
Equity in net (earnings) loss of affiliates	(80	)	—		(80	)			(80	)
Income (loss) from continuing operations	14,777		(973	)	15,750		659		15,091
Income (loss) from operations of discontinued businesses, net of taxes	—		4		(4	)			(4	)
Impairment loss on assets of discontinued businesses, net of taxes	—		969		(969	)			(969	)
Income (loss) from discontinued operations, net of taxes	—		973		(973	)	—		(973	)
Net income (loss)	14,777		—		14,777		659		14,118
Basic earnings (loss) per common share:
Continuing operations	0.11		(0.01	)	0.12		0.01		0.12
Discontinued operations	—		0.01		(0.01	)	—		(0.01	)
Net income (loss)	0.11		—		0.11		0.01		0.11
Diluted earnings (loss) per common share:
Continuing operations	0.11		(0.01	)	0.12		0.00		0.11
Discontinued operations	—		0.01		(0.01	)	—		(0.01	)
Net income (loss)	0.11		—		0.11		0.00		0.11
Weighted shares outstanding
Basic	129,225		129,225		129,225		129,225		129,225
Diluted	132,293		132,293		132,293		132,293		132,293