10-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

     (MARK ONE)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2011

or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission file number 0-23621

MKS INSTRUMENTS, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2277512
(State or other jurisdiction	(I.R.S. Employer
of incorporation or organization)	Identification No.)
2 Tech Drive, Suite 201, Andover, Massachusetts	01810
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (978) 645-5500

     Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

     Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No o

     Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

     Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

     As of April 30, 2011 the registrant had 52,264,426 shares of common stock outstanding.

MKS INSTRUMENTS, INC.
FORM 10-Q
INDEX

PART I. FINANCIAL INFORMATION
ITEM 1. FINANCIAL STATEMENTS (Unaudited)
Consolidated Balance Sheets — March 31, 2011 and December 31, 2010	3
Consolidated Statements of Operations — Three months ended March 31, 2011 and 2010	4
Consolidated Statements of Cash Flows — Three months ended March 31, 2011 and 2010	5
Notes to Unaudited Consolidated Financial Statements	6
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	17
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	22
ITEM 4. CONTROLS AND PROCEDURES	23
PART II. OTHER INFORMATION
ITEM 1. LEGAL PROCEEDINGS	23
ITEM 1A. RISK FACTORS	23
ITEM 6. EXHIBITS	24
SIGNATURES	24
EXHIBIT INDEX
EX-31.1
EX-31.2
EX-32.1
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT

2

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS.

MKS INSTRUMENTS, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share data)

(Unaudited)

	March 31, 2011		December 31, 2010
ASSETS
Current assets:
Cash and cash equivalents	$	259,207	$	162,476
Short-term investments		219,913		269,457
Trade accounts receivable, net		155,682		138,181
Inventories		159,843		156,429
Deferred income taxes		13,489		13,775
Other current assets		15,440		12,577
Total current assets		823,574		752,895
Property, plant and equipment, net		68,912		68,976
Long-term marketable securities		1,301		—
Goodwill		140,020		140,020
Intangible assets, net		1,493		1,743
Other assets		14,019		18,779
Total assets	$	1,049,319	$	982,413
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Short-term borrowings	$	1,511	$	—
Accounts payable		34,856		36,427
Accrued compensation		24,895		29,944
Income taxes payable		13,077		5,347
Other current liabilities		35,713		37,968
Total current liabilities		110,052		109,686
Other liabilities		27,823		25,688
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred Stock, $0.01 par value, 2,000,000 shares authorized; none issued and outstanding		—		—
Common Stock, no par value, 200,000,000 shares authorized; 52,235,202 and 50,648,601 shares issued and outstanding at March 31, 2011 and December 31, 2010, respectively		113		113
Additional paid-in capital		694,355		663,792
Retained earnings		201,636		171,356
Accumulated other comprehensive income		15,340		11,778
Total stockholders’ equity		911,444		847,039
Total liabilities and stockholders’ equity	$	1,049,319	$	982,413

The accompanying notes are an integral part of the consolidated financial statements.

3

MKS INSTRUMENTS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

(Unaudited)

	Three Months Ended
	March 31,
	2011		2010
Net revenues:
Products	$	207,447	$	171,071
Services		24,404		21,095
Total net revenues		231,851		192,166
Cost of revenues:
Cost of products		111,215		94,139
Cost of services		14,275		12,532
Total cost of revenues		125,490		106,671
Gross profit		106,361		85,495
Research and development		16,896		15,675
Selling, general and administrative		32,707		27,812
Amortization of intangible assets		250		469
Gain on sale of assets		—		(682	)
Income from operations		56,508		42,221
Interest income		276		347
Interest expense		5		22
Income from continuing operations before income taxes		56,779		42,546
Provision for income taxes		18,736		13,548
Income from continuing operations		38,043		28,998
Income from discontinued operations, net of taxes		—		227
Net income	$	38,043	$	29,225
Basic income per share:
Continuing operations	$	0.74	$	0.58
Discontinued operations		—		0.01
Net income	$	0.74	$	0.59
Diluted income per share:
Continuing operations	$	0.73	$	0.57
Discontinued operations		—		0.01
Net income	$	0.73	$	0.58
Cash dividends paid per common share	$	0.15	$	—
Weighted average common shares outstanding:
Basic		51,407		49,601
Diluted		52,386		50,600

The accompanying notes are an integral part of the consolidated financial statements.

4

MKS INSTRUMENTS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2011			2010
Cash flows from operating activities:
Net income	$	38,043		$	29,225
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		3,177			3,830
Stock-based compensation		3,092			2,137
Provision for excess and obsolete inventory		3,066			1,925
Deferred income taxes		2,993			506
Excess tax benefits from stock-based compensation		(5,032	)		(80	)
Other		(289	)		(797	)
Changes in operating assets and liabilities:
Trade accounts receivable		(16,838	)		(40,850	)
Inventories		(5,984	)		(10,907	)
Income taxes		12,161			10,570
Other current assets		(1,048	)		(145	)
Accrued expenses and other current liabilities		(4,847	)		10,581
Accounts payable		(1,726	)		10,722
Net cash provided by operating activities		26,768			16,717
Cash flows from investing activities:
Purchases of short-term and long-term available-for-sale investments		(103,721	)		(73,470	)
Maturities, sales and settlements of short-term and long-term available-for-sale investments		152,514			81,808
Purchases of property, plant and equipment		(2,331	)		(3,274	)
Proceeds from sale of assets		4			2,113
Other		(35	)		190
Net cash provided by investing activities		46,431			7,367
Cash flows from financing activities:
Proceeds from short-term borrowings		2,988			39,454
Payments on short-term borrowings		(1,462	)		(42,717	)
Net proceeds (payments) related to employee stock awards		22,672			(2,593	)
Dividend payment to common stockholders		(7,763	)		—
Excess tax benefit from stock-based compensation		5,032			80
Net cash provided by (used in) financing activities		21,467			(5,776	)
Effect of exchange rate changes on cash and cash equivalents		2,065			(1,012	)
Increase in cash and cash equivalents		96,731			17,296
Cash and cash equivalents at beginning of period		162,476			111,009
Cash and cash equivalents at end of period	$	259,207		$	128,305

The accompanying notes are an integral part of the consolidated financial statements.

5

MKS INSTRUMENTS, INC.

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Tables in thousands, except share and per share data)

1) Basis of Presentation

The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. The interim financial data as of March 31, 2011 and for the three months ended March 31, 2011 and 2010 are unaudited; however, in the opinion of MKS, the interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The consolidated balance sheet presented as of December 31, 2010 has been derived from the audited consolidated financial statements as of that date. The unaudited consolidated financial statements presented herein have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by United States generally accepted accounting principles (“U.S. GAAP”). The consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the MKS Annual Report on Form 10-K for the year ended December 31, 2010 filed with the Securities and Exchange Commission on February 25, 2011.

The preparation of these consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, management evaluates its estimates and judgments, including those related to revenue recognition, stock-based compensation, inventory, intangible assets, goodwill and other long-lived assets, acquisition expenses, income taxes and investments. Management bases its estimates and judgments on historical experience and on various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

2) Recently Issued Accounting Pronouncements

In October 2009, the Financial Accounting Standards Board (“FASB”) issued guidance that establishes new accounting and reporting provisions for arrangements including multiple revenue-generating activities. This guidance provides amendments to the criteria for separating deliverables, measuring and allocating arrangement consideration to one or more units of accounting. The amendments in this guidance also establish a selling price hierarchy for determining the selling price of a deliverable. Significantly enhanced disclosures are also required to provide information about a vendor’s multiple-deliverable revenue arrangements, including information about the nature and terms, significant deliverables, and its performance within arrangements. The amendments also require providing information about the significant judgments made and changes to those judgments and about how the application of the relative selling-price method affects the timing or amount of revenue recognition. The amendments in this guidance are effective prospectively for revenue arrangements entered into or materially modified in the fiscal years beginning on or after June 15, 2010. The Company adopted the new guidance in the first quarter of 2011, and the adoption did not have a material impact on the Company’s financial position, results of operations or cash flows.

In October 2009, the FASB issued guidance that changes the accounting model for revenue arrangements that include both tangible products and software elements that are “essential to the functionality,” and scopes these products out of current software revenue guidance. The new guidance includes factors to help companies determine what software elements are considered “essential to the functionality.” The amendments will now subject software-enabled products to other revenue guidance and disclosure requirements, such as guidance surrounding revenue arrangements with multiple-deliverables. The amendments in this guidance are effective prospectively for revenue arrangements entered into or materially modified in the fiscal years beginning on or after June 15, 2010. The Company adopted the new guidance in the first quarter of 2011, and the adoption did not have a material impact on the Company’s financial position, results of operations or cash flows.

3) Cash and Cash Equivalents and Investments

The fair value of short-term available-for-sale investments with maturities or estimated lives of less than one year consists of the following:

	March 31, 2011		December 31, 2010
Time deposits and drafts	$	1,072	$	15,716
Equity mutual funds		510		491
U.S. agency obligations		218,331		253,250
	$	219,913	$	269,457

6

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

The fair value of long-term available-for-sale investments with maturities or estimated lives of more than one year consists of the following:

	March 31, 2011		December 31, 2010
U.S. agency obligations	$	1,301	$	—

The following tables show the gross unrealized gains and (losses) aggregated by investment category:

			Gross		Gross
			Unrealized		Unrealized			Estimated
	Cost		Gains		(Losses)			Fair Value
As of March 31, 2011:
Money market funds	$	19,771	$	—	$	—		$	19,771
Time deposits and drafts		30,107		—		—			30,107
Equity mutual funds		659		—		(149	)		510
U.S. agency obligations		327,554		73		(8	)		327,619
	$	378,091	$	73	$	(157	)	$	378,007
Reported as follows:
Cash and cash equivalents (1)	$	156,791	$	2	$	—		$	156,793
Short-term investments		220,000		70		(157	)		219,913
Long-term marketable securities		1,300		1		—			1,301
	$	378,091	$	73	$	(157	)	$	378,007

			Gross		Gross
			Unrealized		Unrealized			Estimated
	Cost		Gains		(Losses)			Fair Value
As of December 31, 2010:
Money market funds	$	7,032	$	—	$	—		$	7,032
Time deposits and drafts		18,554		—		—			18,554
Equity mutual funds		659		—		(168	)		491
U.S. agency obligations		298,034		42		(35	)		298,041
	$	324,279	$	42	$	(203	)	$	324,118
Reported as follows:
Cash and cash equivalents (1)	$	54,664	$	—	$	(3	)	$	54,661
Short-term investments		269,615		42		(200	)		269,457
	$	324,279	$	42	$	(203	)	$	324,118

(1) The cash and cash equivalent amounts presented in the tables above do not include cash amounts of $102,414,000 and $107,815,000 as of March 31, 2011 and December 31, 2010, respectively.

Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method and realized gains or losses are reflected in income and were not material for the three months ended March 31, 2011 and 2010, respectively.

4) Fair Value Measurements

In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model.

The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value:

7

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

          Level 1 Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 1 assets and liabilities include money market funds and debt and equity securities.

          Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. This category generally includes certain time deposits, time drafts and non-exchange traded derivative contracts.

          Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

The following tables provide a summary of assets and liabilities of the Company measured at fair value on a recurring basis as of March 31, 2011 and December 31, 2010:

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets				Significant
			for Identical		Significant Other		Unobservable
			Assets		Observable		Inputs
Description	March 31, 2011		(Level 1)		Inputs (Level 2)		(Level 3)
Assets:
Available-for-sale securities:
Money market funds	$	19,771	$	19,771	$	—	$	—
Time deposits and drafts		30,107		—		30,107		—
Equity mutual funds		510		510		—		—
U.S. agency obligations		327,619		327,619		—		—
Derivatives — currency forward contracts		343		—		343		—
Total assets	$	378,350	$	347,900	$	30,450	$	—
Liabilities:
Derivatives — currency forward contracts	$	2,746	$	—	$	2,746	$	—
Reported as follows:
Assets:
Cash and cash equivalents	$	156,793	$	127,758	$	29,035	$	—
Short-term investments		219,913		218,841		1,072		—
Long-term marketable securities		1,301		1,301		—		—
Other current assets		343		—		343		—
	$	378,350	$	347,900	$	30,450	$	—
Liabilities:
Other current liabilities	$	2,746	$	—	$	2,746	$	—

8

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant		Significant
			Active Markets for		Other		Unobservable
			Identical Assets		Observable		Inputs
Description	December 31, 2010		(Level 1)		Inputs (Level 2)		(Level 3)
Assets:
Available-for-sale securities:
Money market funds	$	7,032	$	7,032	$	—	$	—
Time deposits and drafts		18,554		—		18,554		—
Equity mutual funds		491		491		—		—
U.S. agency obligations		298,041		298,041		—		—
Derivatives — currency forward contracts		369		—		369		—
Total assets	$	324,487	$	305,564	$	18,923	$	—
Liabilities:
Derivatives — currency forward contracts	$	3,463	$	—	$	3,463	$	—
Reported as follows:
Assets:
Cash and cash equivalents	$	54,661	$	51,823	$	2,838	$	—
Short-term investments		269,457		253,741		15,716		—
Other current assets		369		—		369		—
	$	324,487	$	305,564	$	18,923	$	—
Liabilities:
Other current liabilities	$	3,463	$	—	$	3,463	$	—

Money market funds

As of March 31, 2011 and December 31, 2010, this asset class consisted mainly of a money market portfolio that comprises Federal government and U.S. Treasury securities. The asset class is classified within Level 1 of the fair value hierarchy because its underlying investments are valued using quoted market prices in active markets for identical assets.

Time deposits and drafts

As of March 31, 2011, this asset class consisted primarily of time deposits denominated in the Euro currency and time drafts guaranteed by a financial institution. As of December 31, 2010, this asset class consisted of time deposits denominated in the Euro currency. The asset class is valued using other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and are classified within Level 2 of the fair value hierarchy.

Equity mutual funds

As of March 31, 2011 and December 31, 2010, this asset class consisted of certain U.S. and international equity mutual funds, classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices in an active market for identical assets. The equity mutual funds are associated with the Company’s supplemental defined contribution retirement obligations.

U.S. agency obligations

As of March 31, 2011 and December 31, 2010, this asset class consisted of U.S. agency obligations classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices in an active market for identical assets.

Derivatives

As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. The forward foreign

9

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

currency exchange contracts are valued using broker quotations, or market transactions and are classified within Level 2 of the fair value hierarchy.

5) Derivatives

The Company enters into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments and those utilized as economic hedges. The Company operates internationally and, in the normal course of business, is exposed to fluctuations in interest rates and foreign exchange rates. These fluctuations can increase the costs of financing, investing and operating the business. The Company has used derivative instruments, such as forward contracts, to manage certain foreign currency exposure.

By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions and no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties.

The Company hedges a portion of its forecasted foreign currency denominated intercompany sales of inventory, over a maximum period of eighteen months, using forward foreign exchange contracts accounted for as cash-flow hedges related to Japanese, South Korean, British and European currencies. To the extent these derivatives are effective in off-setting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives’ fair value are not included in current earnings but are included in other comprehensive income (“OCI”) in stockholders’ equity. These changes in fair value will subsequently be reclassified into earnings, as applicable, when the forecasted transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The cash flows resulting from forward exchange contracts are classified in the consolidated statements of cash flows as part of cash flows from operating activities. The Company does not enter into derivative instruments for trading or speculative purposes.

To the extent the hedge accounting criteria is not met, the related foreign currency forward contracts are considered as economic hedges and changes in the fair value of these contracts are recorded immediately in earnings in the period in which they occur. These include hedges that are used to reduce exchange rate risks arising from the change in fair value of certain foreign currency denominated assets and liabilities (i.e., payables, receivables) and other economic hedges where the hedge accounting criteria were not met.

As of March 31, 2011 and December 31, 2010, the Company had outstanding forward foreign exchange contracts with gross notional values of $75,896,000 and $87,666,000, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of March 31, 2011 and December 31, 2010:

	March 31, 2011
	Gross Notional
Currency Hedged (Buy/Sell)	Value		Fair Value (1)
U.S. Dollar/Japanese Yen	$	36,487	$	(1,232	)
U.S. Dollar/South Korean Won		24,225		(956	)
U.S. Dollar/Euro		8,553		(175	)
U.S. Dollar/U.K. Pound Sterling		6,631		(40	)
Total	$	75,896	$	(2,403	)

10

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

	December 31, 2010
	Gross Notional
Currency Hedged (Buy/Sell)	Value			Fair Value (1)
U.S. Dollar/Japanese Yen	$	50,104		$	(2,876	)
U.S. Dollar/South Korean Won		27,574			(563	)
U.S. Dollar/Euro		6,934			305
U.S. Dollar/U.K. Pound Sterling		3,054			40
Total	$	87,666		$	(3,094	)
(1)    Represents the net receivable (payable) amount included in the consolidated balance sheets.
The following table provides a summary of the fair value amounts of the Company’s derivative instruments:
Derivatives Designated as Hedging Instruments	March 31, 2011			December 31, 2010
Derivative assets:
Forward exchange contracts	$	343		$	369
Derivative liabilities:
Forward exchange contracts		(2,746	)		(3,463	)
Total net derivative liability designated as hedging instruments (1)	$	(2,403	)	$	(3,094	)

(1) The derivative asset of $343,000 and derivative liability of $2,746,000 are classified in other current assets and other current liabilities, respectively, in the consolidated balance sheet as of March 31, 2011. The derivative asset of $369,000 and derivative liability of $3,463,000 are classified in other current assets and other current liabilities, respectively, in the consolidated balance sheet as of December 31, 2010.

The following table provides a summary of the gains (losses) on derivatives designated as hedging instruments:

	Three Months Ended
Derivatives Designated as Cash Flow Hedging Relationships	March 31,
	2011			2010
Forward exchange contracts:
Net (loss) gain recognized in OCI (1)	$	(162	)	$	481
Net loss reclassified from OCI into income (2)		(526	)		(138	)

(1)	Net change in the fair value of the effective portion classified in OCI.
(2)	Effective portion classified in selling, general and administrative.

6) Inventories

Inventories consist of the following:

	March 31, 2011		December 31, 2010
Raw material	$	82,740	$	82,012
Work-in-process		22,766		21,891
Finished goods		54,337		52,526
	$	159,843	$	156,429

7) Goodwill and Intangible Assets

Goodwill

The Company tests goodwill for impairment on an annual basis, which has been determined to be as of October 31 of each fiscal year. The Company also tests goodwill between annual tests if an event occurs or circumstances change that indicate that the fair value of a reporting unit may be below its carrying value.

Goodwill impairment is determined using a two-step process. The first step involves a comparison of the estimated fair value of a reporting unit to its carrying amount, including goodwill. In performing the first step, the Company determines the fair value of a

11

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

reporting unit using a discounted cash flow (“DCF”) analysis. Determining fair value requires the exercise of significant judgment, including judgments about appropriate discount rates, perpetual growth rates, and the amount and timing of expected future cash flows. Discount rates are based on a weighted average cost of capital (“WACC”), which represents the average rate a business must pay its providers of debt and equity. The WACC used to test goodwill was derived from a group of comparable companies. The cash flows employed in the DCF analysis were derived from internal earnings and forecasts and external market forecasts. If the estimated fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is not impaired and the second step of the impairment test is not necessary. If the carrying amount of a reporting unit exceeds its estimated fair value, then the second step of the goodwill impairment test must be performed.

The second step of the goodwill impairment test compares the implied fair value of the reporting unit’s goodwill with its carrying amount of goodwill to measure the amount of impairment loss, if any. The implied fair value of goodwill is determined in the same manner as the amount of goodwill recognized in a business combination, whereby the estimated fair value of the reporting unit is allocated to all of the assets and liabilities of that unit (including any unrecognized intangible assets) as if the reporting unit had been acquired in a business combination and the fair value of the reporting unit was the purchase price paid. If the carrying amount of the reporting unit’s goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess.

As of October 31, 2010, the Company performed its annual impairment assessment of goodwill and determined that no impairment charges were required, as the fair value of each reporting unit exceeded its book value.

The changes in the carrying amount of goodwill and accumulated impairment losses during the three months ended March 31, 2011 and the twelve months ended December 31, 2010 were as follows:

	2011							2010
	Gross		Accumulated					Gross			Accumulated
	Carrying		Impairment					Carrying			Impairment
	Amount		Loss			Net		Amount			Loss			Net
Beginning balance at January 1	$	279,434	$	(139,414	)	$	140,020	$	337,765		$	(193,254	)	$	144,511
Acquired goodwill (1)		—		—			—		2,292			—			2,292
Sale of discontinued operations (2)		—		—			—		(60,623	)		53,840			(6,783	)
Ending balance at March 31, 2011 and December 31, 2010	$	279,434	$	(139,414	)	$	140,020	$	279,434		$	(139,414	)	$	140,020

(1)	In 2010, the Company purchased a technology company for $2,447,000 to enhance its product portfolio. The Company recorded $2,292,000 of goodwill in connection with the acquisition.
(2)	In 2010, the Company sold its Ion business and assets of its YDI business and as a result charged the related net goodwill to the gain on sale of discontinued operations.

Intangible Assets

Components of the Company’s acquired intangible assets are comprised of the following:

			Accumulated
	Gross		Amortization			Net
As of March 31, 2011:
Completed technology	$	76,829	$	(76,382	)	$	447
Customer relationships		8,940		(8,156	)		784
Patents, trademarks, trade names and other		24,638		(24,376	)		262
	$	110,407	$	(108,914	)	$	1,493

			Accumulated
	Gross		Amortization			Net
As of December 31, 2010
Completed technology	$	76,829	$	(76,230	)	$	599
Customer relationships		8,940		(8,083	)		857
Patents, trademarks, trade names and other		24,638		(24,351	)		287
	$	110,407	$	(108,664	)	$	1,743

12

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

Aggregate amortization expense related to acquired intangibles for the three months ended March 31, 2011 and 2010 were $250,000 and $469,000, respectively. Estimated amortization expense for each of the three remaining fiscal years is as follows:

Year	Amount
2011 (remaining)	$	738
2012		389
2013		366

8) Debt

The Company’s Japanese subsidiary has lines of credit and short-term borrowing arrangements with two financial institutions which provide for aggregate borrowings as of March 31, 2011 of up to an equivalent of $30,164,000 U.S. dollars, which generally expire and are renewed at three month intervals. At March 31, 2011 total borrowings outstanding under these arrangements were $1,511,000 at an interest rate of 1.475%. There were no borrowings outstanding at December 31, 2010.

9) Product Warranties

The Company provides for the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligation is affected by shipment volume, product failure rates, utilization levels, material usage, and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required. The product warranty liability is included in other current liabilities in the consolidated balance sheets.

Product warranty activities were as follows:

	Three Months Ended March 31,
	2011			2010
Balance at January 1	$	9,865		$	6,560
Provision for product warranties		1,986			1,628
Direct charges to warranty liability		(1,898	)		(967	)
Balance at March 31	$	9,953		$	7,221

10) Income Taxes

The Company’s effective tax rate for the three months ended March 31, 2011 and 2010 was 33.0% and 31.8%, respectively. The effective tax rates for the three months ended March 31, 2011 and 2010 and the related income tax provisions were lower than the U.S. statutory tax rate primarily due to geographic mix of income and profits earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory rate.

At March 31, 2011, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $15,996,000. At December 31, 2010, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $15,270,000. The net increase from December 31, 2010 was primarily attributable to an increase in reserves for existing uncertain tax positions. If these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $12,789,000, excluding interest and penalties, would impact the Company’s effective tax rate. The Company accrues interest expense and, if applicable, penalties for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. At March 31, 2011 and December 31, 2010, the Company had accrued interest on unrecognized tax benefits of approximately $1,138,000 and $986,000, respectively.

The Company and its subsidiaries are subject to examination by federal, state and foreign tax authorities. The statute of limitations for the Company’s tax filings varies by tax jurisdiction between fiscal years 2001 through present.

13

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

While the Company believes it has adequately provided for all tax positions, amounts asserted by taxing authorities could materially differ from the Company’s accrued positions as a result of uncertain and complex application of tax regulations. Additionally, the recognition and measurement of certain tax benefits include estimates and judgment by management and inherently includes subjectivity. Accordingly, the Company could record additional provisions or benefits due to U.S. federal, state, and foreign tax-related matters in the future as it revises estimates or settles or otherwise resolves the underlying matters.

11) Discontinued Operations

During the second quarter of 2010, the Company executed a plan to divest two product lines, as their growth potential no longer met the Company’s long-term strategic objectives. The Company completed the sale of Ion on May 17, 2010 for $15,092,000 of net cash proceeds after expenses and recorded a pre-tax gain on the sale of $4,208,000. The Company completed the sale of the assets of its YDI business on August 11, 2010 for $490,000 of net cash proceeds after expenses and recorded a pre-tax gain on the sale of $224,000.

The two product lines have been accounted for as discontinued operations. Accordingly, their results of operations have been reclassified to discontinued operations in the consolidated statements of operations for all periods presented. The assets and liabilities of these discontinued businesses have not been reclassified or segregated in the consolidated balance sheets or consolidated statements of cash flows due to their immaterial amounts. Net revenues and income from discontinued operations for the three months ended March 31, 2011 and 2010 are below:

	Three Months Ended March 31,
	2011		2010
Net revenues	$	—	$	5,903
Income from discontinued operations before income taxes		—		433
Income tax provision		—		206
Income from discontinued operations	$	—	$	227
12) Net Income Per Share
The following table sets forth the computation of basic and diluted net income per share:
	Three Months Ended March 31,
	2011		2010
Numerator:
Income from continuing operations	$	38,043	$	28,998
Income from discontinued operations, net of tax		—		227
Net income	$	38,043	$	29,225
Denominator:
Shares used in net income per common share — basic		51,407,000		49,601,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		979,000		999,000
Shares used in net income per common share — diluted		52,386,000		50,600,000
Basic income per common share:
Continuing operations	$	0.74	$	0.58
Discontinued operations		—		0.01
Net income	$	0.74	$	0.59
Diluted income per common share:
Continuing operations	$	0.73	$	0.57
Discontinued operations		—		0.01
Net income	$	0.73	$	0.58

14

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (stock options and restricted stock units) had been converted to such common shares, and if such assumed conversion is dilutive.

As of March 31, 2011, stock options and restricted stock units relating to an aggregate of approximately 1,504,968 shares were outstanding. For the three months ended March 31, 2011, 180,292 shares were excluded from the dilutive computation because the exercise price of the options exceeded the average price per share during the period.

As of March 31, 2010, stock options and restricted stock units relating to an aggregate of approximately 3,737,781 shares were outstanding. For the three months ended March 31, 2010, 1,388,643 shares were excluded from the dilutive computation because the exercise price of the options exceeded the average price per share during the period.

13) Comprehensive Income

Components of comprehensive income were as follows:

	Three Months Ended March 31,
	2011		2010
Net income	$	38,043	$	29,225
Other comprehensive income (loss):
Changes in value of financial instruments designated as cash flow hedges (net of tax)		394		216
Foreign currency translation adjustments		3,124		(1,968	)
Unrealized gain (loss) on investments (net of tax)		48		(35	)
Other comprehensive income (loss)		3,566		(1,787	)
Total comprehensive income	$	41,609	$	27,438

14) Geographic, Product and Significant Customer Information

The Company operates in one segment for the development, manufacturing, sales and servicing of products that measure, control, power and monitor critical parameters of advanced manufacturing processes. The Company’s chief decision-maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire Company.

Information about the Company’s operations in different geographic regions is presented in the tables below. Net revenues to unaffiliated customers are based on the location in which the sale originated. Transfers between geographic areas are at negotiated transfer prices and have been eliminated from consolidated net revenues.

	Three Months Ended March 31,
	2011		2010
Geographic net revenues:
United States	$	110,603	$	112,802
Japan		24,639		30,596
Europe		29,704		20,296
Asia (excluding Japan)		66,905		28,472
	$	231,851	$	192,166

15

MKS INSTRUMENTS, INC.
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS — (continued)
(Tables in thousands, except share and per share data)

	March 31, 2011		December 31, 2010
Long-lived assets (1):
United States	$	53,155	$	54,840
Japan		4,048		4,273
Europe		5,139		4,970
Asia (excluding Japan)		8,512		8,597
	$	70,854	$	72,680
(1)    Long-lived assets include property, plant and equipment, net and certain other assets.
The Company groups its products into three product groups. Net product and service revenues for these product groups are as follows:
	Three Months Ended March 31,
	2011		2010
Instruments and Control Systems	$	112,136	$	89,096
Power and Reactive Gas Products		96,482		85,771
Vacuum Products		23,233		17,299
	$	231,851	$	192,166

15) Commitments and Contingencies

Brooks Instrument, LLC filed two lawsuits, in one case along with their affiliate BI Products, LLC (collectively with Brooks Instrument, LLC, “Brooks”), against the Company in the United States District Court for the Eastern District of Texas, on April 29, 2010. Brooks also filed one lawsuit against the Company in the United States District Court for the District of Massachusetts on April 29, 2010. These suits were related to the Company’s digital mass flow controllers and digital pressure sensors. Brooks sought injunctive relief and damages for alleged patent infringement, breach of contract and trade secret violations. None of the lawsuits specified a specific amount of damages. The Company responded to the allegations to deny any wrongdoing. In addition, the Company filed counterclaims against Brooks in the courts where they initially brought suit against the Company, seeking injunctive relief and damages for alleged patent infringement by Brooks, relating to their pressure transient insensitive mass flow controllers. On February 22, 2011, the parties entered into a settlement agreement, resolving all the issues in the cases, and on February 23, 2011, the parties filed stipulated dismissals with the appropriate courts.

The Company is subject to various other legal proceedings and claims, which have arisen in the ordinary course of business.

In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

The Company reviewed its contractual obligations and commercial commitments as of March 31, 2011 and determined that there were no significant changes from the ones set forth in the notes to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.

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MKS INSTRUMENTS, INC.

          ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

          This Quarterly Report on Form 10-Q contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act. When used herein, the words “believes,” “anticipates,” “plans,” “expects,” “estimates,” “would,” “will,” “intends” and similar expressions are intended to identify forward-looking statements. These forward-looking statements reflect management’s current opinions and are subject to certain risks and uncertainties that could cause results to differ materially from those stated or implied. While we may elect to update forward looking statements at some point in the future, we specifically disclaim any obligation to do so even if our estimates or expectations change. Risks and uncertainties include, but are not limited to those discussed in our Annual Report on Form 10-K for the year ended December 31, 2010 in the section entitled “Risk Factors” as referenced in Part II, Item 1A “Risk Factors” of this Quarterly Report on Form 10-Q.

Overview

          We are a leading global provider of instruments, subsystems and process control solutions that measure, control, power, monitor and analyze critical parameters of advanced manufacturing processes to improve process performance and productivity. We also provide services relating to the maintenance and repair of our products, software maintenance, installation services and training.

          Our products are used in diverse markets, applications and processes. The primary markets we serve are manufacturers of capital equipment for semiconductor devices and for other thin film applications including flat panel displays, light emitting diodes (“LEDs”), solar cells, data storage media and other advanced coatings. We also leverage our technology into other markets with advanced manufacturing applications including medical equipment, pharmaceutical manufacturing, energy generation and environmental monitoring.

          We are managed as one operating segment. We group our products into three product groups: Instruments and Control Systems, Power and Reactive Gas Products and Vacuum Products. Our products are derived from our core competencies in pressure measurement and control, materials delivery, gas composition analysis, control and information technology, power and reactive gas generation and vacuum technology.

          We have a diverse base of customers that includes manufacturers of semiconductor capital equipment and semiconductor devices, thin film capital equipment used in the manufacture of flat panel displays, LEDs, solar cells, data storage media, and other coating applications; and other industrial, medical, pharmaceutical manufacturing, energy generation, environmental monitoring and other advanced manufacturing companies, as well as university, government and industrial research laboratories. For the three months ended March 31, 2011 and the full year ended December 31, 2010, we estimate that 59% and 64% of our net sales, respectively, were to semiconductor capital equipment manufacturers and semiconductor device manufacturers. We expect that sales to semiconductor capital equipment manufacturers and semiconductor device manufacturers will continue to account for a substantial portion of our sales.

          During 2010, we executed a plan to divest two product lines, as their growth potential no longer met our long-term strategic objectives. We completed the sale of Ion Systems, Inc. (“Ion”) during the second quarter of 2010 and the sale of the assets of the Yield Dynamics, LLC (“YDI”) business during the third quarter of 2010 and received total net proceeds of $15.6 million. The results of operations of the two product lines have been classified as discontinued operations in the consolidated statements of operations for the three months ended March 31, 2010. The assets and liabilities of these discontinued product lines have not been reclassified and segregated in the consolidated balance sheets or consolidated statements of cash flows due to their immaterial amounts.

          We have seen a continued improvement in the global economy since late 2009, which has contributed to an increase in our business, financial condition and results of operations for the three months ended March 31, 2011 compared to the same period for the prior year. As a result of the improved global economy, our net revenues to semiconductor capital equipment manufacturers and semiconductor device manufacturers increased 13% for the three months ended March 31, 2011 compared to the same period for the prior year. Although our business levels have increased since 2009, the semiconductor capital equipment industry is subject to rapid demand shifts, which are difficult to predict, and we are uncertain as to the timing or extent of further increased demand or any future weakness in the semiconductor capital equipment industry.

          Our net revenues sold to other advanced markets, which exclude semiconductor capital equipment and semiconductor device product applications, increased 34% for the three months ended March 31, 2011 compared to the same period for the prior year. The increase was mainly due to product revenues from a thin film solar customer in China. These advanced and growing markets include LED, medical, biopharm, environmental, thin films, solar and other markets and we anticipate that these markets will continue to grow and will represent a larger portion of our revenue.

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     A significant portion of our net sales is to operations in international markets. International net sales include sales by our foreign subsidiaries, but exclude direct export sales. For the three months ended March 31, 2011 and the year ended December 31, 2010, international net sales accounted for approximately 52% and 43% of our net sales, respectively. A significant portion of our international net sales were in Japan and China. We expect that international net sales will continue to represent a significant percentage of our total net sales.

Critical Accounting Policies and Estimates

     The preparation of our consolidated financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make judgments, assumptions and estimates that affect the amounts reported. There have been no material changes in our critical accounting policies since December 31, 2010. For further information, please see the discussion of critical accounting policies in our Annual Report on Form 10-K for the year ended December 31, 2010 in the section captioned “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies and Estimates.”

Results of Operations

     The following table sets forth, for the periods indicated, the percentage of total net revenues of certain line items included in MKS’ consolidated statements of operations data.

	Three Months Ended March 31,
	2011			2010
Net revenues:
Product		89.5	%		89.0	%
Services		10.5			11.0
Total net revenues		100.0			100.0
Cost of revenues:
Cost of product revenues		48.0			49.0
Cost of service revenues		6.1			6.5
Total cost of revenues		54.1			55.5
Gross profit		45.9			44.5
Research and development		7.3			8.2
Selling, general and administrative		14.1			14.5
Amortization of intangible assets		0.1			0.2
Gain on sale of assets		—			(0.4	)
Income from operations		24.4			22.0
Interest income, net		0.1			0.2
Income from continuing operations before income taxes		24.5			22.2
Provision for income taxes		8.1			7.1
Income from continuing operations		16.4			15.1
Income from discontinued operations, net of taxes		—			0.1
Net income		16.4	%		15.2	%

Net Revenues (dollars in millions)

	Three Months Ended March 31,
	2011		2010		% Change
Net Revenues:
Product	$	207.5	$	171.1		21.3	%
Service		24.4		21.1		15.7
Total net revenues	$	231.9	$	192.2		20.7	%

     Product revenues increased $36.4 million during the three months ended March 31, 2011, compared to the same period for the prior year. We have seen a continued recovery in the global economy since late 2009 which has contributed to an increase in demand for our products in many of the markets we serve. Our increase in overall product revenues is primarily due to the increase in our net revenues sold to other advanced markets, which exclude semiconductor capital equipment and semiconductor device product applications. The product revenues to these customers increased by $22.0 million or 33.5% compared to the same period for the prior year. The product revenues related to our semiconductor capital equipment manufacturer and semiconductor device manufacturer customers increased by $14.3 million or 13.6% during the three months ended March 31, 2011, compared to the same period for the prior year. The increase in demand in our other markets included the LED, biopharm, environmental, thin films, solar and other markets.

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     Service revenues consisted mainly of fees for services relating to the maintenance and repair of our products, software maintenance, installation services and training. Service revenues increased $3.3 million or 15.7% during the three months ended March 31, 2011, compared to the same period for the prior year, as a result of the continued improvement in the global economy and an increase in product sales.

     Total international net revenues, including product and service, were $121.2 million for the three months ended March 31, 2011, or 52.3% of net revenues compared to $79.4 million for the three months ended March 31, 2010, or 41.3% of net revenues. The increases are due to a general increase in worldwide demand from many of the markets we serve as a result of continued improvement in the global economy. A significant portion of this increase was due to product revenues from a thin film solar customer in China.

Gross Profit

	Three Months Ended March 31,
	2011			2010			% Points Change
Gross profit as percentage of net revenues:
Product		46.4	%		45.0	%		1.4	%
Service		41.5			40.6			0.9
Total gross profit percentage		45.9	%		44.5	%		1.4	%

     Gross profit on product revenues increased by 1.4 percentage points for the three months ended March 31, 2011, compared to the same period for the prior year. The increase is due to an increase of 2.8 percentage points due to favorable product mix, an increase in product revenue volumes which accounted for 0.9 percentage points since a portion of our overhead costs are fixed and an increase of 0.4 percentage points from favorable foreign exchange fluctuations. These increases were partially offset by 2.1 percentage points due to higher overhead spending and 0.7 percentage points related to higher excess and obsolete inventory related net charges. The higher overhead spending is due to higher salary and fringe related costs for additional personnel due to the higher business levels and an increase in incentive compensation.

     Cost of service revenues consists primarily of costs of providing services for repair and training which includes salaries and related expenses and other fixed costs. Service gross profit increased by 0.9 percentage points for the three months ended March 31, 2011, compared to the same period for the prior year. The increase is mainly a result of higher service revenues since a portion of our overhead costs are fixed.

Research and Development (dollars in millions)

	Three Months Ended March 31,
	2011		2010		% Change
Research and development expenses	$	16.9	$	15.7		7.8	%

     Research and development expense increased $1.2 million during the three months ended March 31, 2011, compared to the same period for the prior year. The increase includes a $1.3 million increase in compensation expense and a $0.4 million increase in patent and other legal related costs offset by a $0.5 million decrease in spending on project materials. The increase in compensation expense is due to higher salary costs for additional personnel and an increase in stock-based compensation costs. In addition, compensation costs increased as fringe related costs were higher as a result of increased taxes related to an incentive compensation payment and the restoration in the second quarter of 2010 of the employer match portion of the 401(k) profit-sharing plan and employee stock purchase plans.

     Our research and development is primarily focused on developing and improving our instruments, components, subsystems and process control solutions to improve process performance and productivity.

     We have thousands of products and our research and development efforts primarily consist of a large number of projects related to these products, none of which is individually material to us. Current projects typically have a duration of 3 to 30 months depending upon whether the product is an enhancement of existing technology or a new product. Our current initiatives include projects to enhance the performance characteristics of older products, to develop new products and to integrate various technologies into subsystems. These projects support in large part the transition in the semiconductor industry to smaller integrated circuit geometries and in the flat panel display and solar markets to larger substrate sizes, which require more advanced process control technology. Research and development expenses consist primarily of salaries and related expenses for personnel engaged in research and development, fees paid to consultants, material costs for prototypes and other expenses related to the design, development, testing and enhancement of our products as well as legal costs associated with maintaining and defending our intellectual property.

     We believe that the continued investment in research and development and ongoing development of new products are essential to the expansion of our markets, and expect to continue to make significant investment in research and development activities. We are subject to

19

risks if products are not developed in a timely manner, due to rapidly changing customer requirements and competitive threats from other companies and technologies. Our success primarily depends on our products being designed into new generations of equipment for the semiconductor industry. We develop products that are technologically advanced so that they are positioned to be chosen for use in each successive generation of semiconductor capital equipment. If our products are not chosen to be designed into our customers’ products, our net revenues may be reduced during the lifespan of those products.

Selling, General and Administrative (dollars in millions)

	Three Months Ended March 31,
	2011		2010		% Change
Selling, general and administrative expenses	$	32.7	$	27.8		17.6	%

     Selling, general and administrative expenses increased $4.9 million for the three months ended March 31, 2011, compared to the same period for the prior year. The increase includes a $2.4 million increase in compensation expense, a $2.0 million increase in consulting and professional fees, a $0.3 million increase in travel related expenses and a $0.2 million increase in the provision for uncollectable accounts offset by a $0.3 million decrease in depreciation expense. The increase in compensation expense is due to higher salary costs for additional personnel and an increase in stock-based compensation costs. In addition, fringe related costs increased as a result of increased taxes related to an incentive compensation payment and the restoration in the second quarter of 2010 of the employer match portion of the 401(k) profit-sharing plan and employee stock purchase plans.

Amortization of Intangible Assets (dollars in millions)

	Three Months Ended March 31,
	2011	2010		% Change
Amortization of intangible assets	$0.3	$	0.5		(46.7	)%

     Amortization expense for the three months ended March 31, 2011 decreased $0.2 million, compared to the same period for the prior year, as certain intangible assets became fully amortized during 2010.

Gain on Sale of Assets (dollars in millions)

	Three Months Ended March 31,
	2011	2010		% Change
Gain on sale of assets	$—	$	0.7		(100.0	)%

     During the first quarter of 2010, we sold two vacated facilities for proceeds of $2.1 million and recorded a $0.7 million net gain on these sales.

Interest Income, Net (dollars in millions)

	Three Months Ended March 31,
	2011		2010		% Change
Interest income, net	$	0.3	$	0.3		(16.6	)%

     Interest income, net decreased modestly in the three months ended March 31, 2011 compared to the same period for the prior year, mainly related to lower interest rates compared to the same period for the prior year.

Provision for Income Taxes (dollars in millions)

	Three Months Ended March 31,
	2011		2010
Provision for income taxes	$	18.7	$	13.5

     Our effective tax rate for the three months ended March 31, 2011 and 2010 was 33.0% and 31.8%, respectively. The first quarter 2011 and 2010 effective tax rates and the related income tax provisions were lower than the U.S. statutory tax rate primarily due to geographic mix of income and profits earned by our international subsidiaries being taxed at rates lower than the U.S. statutory rate.

     At March 31, 2011, our total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $16.0 million. At December 31, 2010, our total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $15.3 million. The net increase from December 31, 2010 was primarily attributable to an increase in reserves for existing uncertain tax positions. If these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $12.8 million, excluding interest and penalties, would impact our effective tax rate. We accrue interest expense and, if applicable,

20

penalties for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. At March 31, 2011 and December 31, 2010, we had accrued interest on unrecognized tax benefits of approximately $1.1 million and $1.0 million, respectively.

          We and our subsidiaries are subject to examination by federal, state and foreign tax authorities. The statute of limitations for our tax filings varies by tax jurisdiction between fiscal years 2001 through present.

          Our future effective income tax rate depends on various factors, such as tax legislation and the geographic composition of our pre-tax income. We monitor these factors and timely adjust our effective tax rate accordingly. Additionally, the effective tax rate could be adversely affected by changes in the valuation of deferred tax assets and liabilities. In particular, the carrying value of deferred tax assets, which are predominantly in the United States, is dependent on our ability to generate sufficient future taxable income in the United States. While we believe we have adequately provided for all tax positions, amounts asserted by taxing authorities could materially differ from our accrued positions as a result of uncertain and complex application of tax regulations. Additionally, the recognition and measurement of certain tax benefits include estimates and judgment by management and inherently includes subjectivity. Accordingly, we could record additional provisions or benefits due to U.S. federal, state, and foreign tax-related matters in the future as we revise estimates or settle or otherwise resolve the underlying matters.

Discontinued Operations

	Three Months Ended March 31,
	2011	2010
Income from discontinued operations, net of taxes	$—	$	0.2

     During 2010, we divested two product lines as their growth potential no longer met our long-term strategic objectives. We completed the sale of Ion on May 17, 2010 and the sale of the assets of our YDI business on August 11, 2010 for a total of $15.6 million of net cash proceeds after expenses and recorded a $4.4 million pre-tax gain on the combined sales.

          The two product lines have been accounted for as discontinued operations. Accordingly, their results of operations have been reclassified to discontinued operations in the consolidated statements of operations for 2010. The assets and liabilities of these discontinued product lines have not been reclassified or segregated in the consolidated statements of cash flows due to their immaterial amounts.

Liquidity and Capital Resources

          Cash, cash equivalents, long-term and short-term investments totaled $480.4 million at March 31, 2011 compared to $431.9 million at December 31, 2010. This increase was mainly attributable to our net cash provided by operating activities as a result of our net income, net proceeds related to employee stock awards, partially offset by a dividend payment to our common shareholders and capital expenditures.

          Net cash provided by operating activities of $26.8 million for the three months ended March 31, 2011, resulted mainly from net income of $38.0 million and non-cash charges of $9.3 million, partially offset by an $18.3 million change in working capital and a $5.0 million increase in excess tax benefits from stock-based compensation. The increase in working capital consisted primarily of a $16.8 million increase in trade accounts receivable and a $6.0 million increase in inventory as a result of our increased business levels, partially offset by a $12.2 million increase in income taxes payable as a result of our higher operating income.

          Net cash provided by operating activities of $16.7 million for the three months ended March 31, 2010, resulted mainly from net income of $29.2 million and non-cash charges of $7.9 million, partially offset by a $20.0 million change in working capital. The decrease in working capital consisted primarily of a $40.9 million increase in trade accounts receivable and an increase of $10.9 million of inventory as a result of our increased business levels. The increase in net operating assets was partially offset by an increase of $10.7 million in accounts payable related to inventory purchases to support our increased business levels, an increase of $7.0 million in accrued compensation and an increase of $10.6 million in income taxes payable.

          Net cash provided by investing activities of $46.4 million for the three months ended March 31, 2011, resulted primarily from the net sales of $48.8 million of short-term and long-term available-for-sale investments partially offset by $2.3 million in purchases of production related equipment. Net cash provided by investing activities of $7.4 million for the three months ended March 31, 2010, resulted from the net sales of $8.3 million of short-term available-for-sale investments and proceeds of $2.1 million from the sale of two vacated facilities, partially offset by $3.3 million in purchases of production-related equipment.

          Net cash provided by financing activities was $21.5 million for the three months ended March 31, 2011 and consisted primarily of $27.8 million cash received from the exercise of previously issued stock options and $5.0 million from excess tax benefits from stock-based compensation. These increases were partially offset by $5.1 million in taxes paid upon the vesting of restricted stock units and a $7.8 million dividend payment to common stockholders. Net cash used in financing activities was $5.8 million for the three months ended March 31, 2010 and consisted primarily of $3.3 million in net payments on short-term borrowings and $2.6 million related to stock-based compensation.

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          Our Japanese subsidiary has lines of credit and short-term borrowing arrangements with two financial institutions which provide for aggregate borrowings as of March 31, 2011 of up to an equivalent of $30.2 million U.S. dollars, which generally expire and are renewed at three month intervals. At March 31, 2011 total borrowings outstanding under these arrangements were $1.5 million at an interest rate of 1.475%. There were no borrowings outstanding at December 31, 2010.

          On May 2, 2011, our Board of Directors authorized a quarterly cash dividend of $0.15 per share, payable on June 17, 2011 to shareholders of record as of June 1, 2011.

          On February 1, 2011, our Board of Directors authorized a quarterly cash dividend of $0.15 per share, payable on March 18, 2011 to shareholders of record as of March 1, 2011. Our cash payment for the dividend on March 18, 2011 was $7.8 million. Future dividend declarations, as well as the record and payment dates for such dividends, are subject to the final determination of our Board of Directors.

          We believe that our current cash position and available borrowings will be sufficient to satisfy our estimated working capital and planned capital expenditure requirements through at least the next 12 months and the foreseeable future.

Off-Balance Sheet Arrangements

          We do not have any financial partnerships with unconsolidated entities, such as entities often referred to as structured finance, special purpose entities or variable interest entities, which are often established for the purpose of facilitating off-balance sheet arrangements or for other contractually narrow or limited purposes. Accordingly, we have no off-balance sheet arrangements that have or are reasonably expected to have a current or future effect on our financial condition, results of operations, liquidity, capital expenditures or capital resources that are material to investors.

Recently Issued Accounting Pronouncements

          In October 2009, the Financial Accounting Standards Board (“FASB”) issued guidance that establishes new accounting and reporting provisions for arrangements including multiple revenue-generating activities. This guidance provides amendments to the criteria for separating deliverables, measuring and allocating arrangement consideration to one or more units of accounting. The amendments in this guidance also establish a selling price hierarchy for determining the selling price of a deliverable. Significantly enhanced disclosures are also required to provide information about a vendor’s multiple-deliverable revenue arrangements, including information about the nature and terms, significant deliverables, and its performance within arrangements. The amendments also require providing information about the significant judgments made and changes to those judgments and about how the application of the relative selling-price method affects the timing or amount of revenue recognition. The amendments in this guidance are effective prospectively for revenue arrangements entered into or materially modified in the fiscal years beginning on or after June 15, 2010. We adopted the new guidance in the first quarter of 2011 and the adoption did not have a material impact on our financial position, results of operations, or cash flows.

          In October 2009, the FASB issued guidance that changes the accounting model for revenue arrangements that include both tangible products and software elements that are “essential to the functionality,” and scopes these products out of current software revenue guidance. The new guidance includes factors to help companies determine what software elements are considered “essential to the functionality.” The amendments will now subject software-enabled products to other revenue guidance and disclosure requirements, such as guidance surrounding revenue arrangements with multiple-deliverables. The amendments in this guidance are effective prospectively for revenue arrangements entered into or materially modified in the fiscal years beginning on or after June 15, 2010. We adopted the new guidance in the first quarter of 2011 and the adoption did not have a material impact on our financial position, results of operations, or cash flows.

          ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

          Information concerning market risk is contained in the section entitled “Quantitative and Qualitative Disclosures About Market Risk” contained in our Annual Report on Form 10-K for the year ended December 31, 2010 filed with the Securities and Exchange Commission on February 25, 2011. As of March 31, 2011, there were no material changes in our exposure to market risk from December 31, 2010.

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          ITEM 4. CONTROLS AND PROCEDURES.

          Evaluation of Disclosure Controls and Procedures

          Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2011. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), means controls and other procedures of an issuer that are designed to ensure that information required to be disclosed by the issuer in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Exchange Act is accumulated and communicated to the issuer’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of March 31, 2011, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer as appropriate to allow timely decisions regarding required disclosure.

          Changes in Internal Control over Financial Reporting

          There was no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended March 31, 2011 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

          PART II. OTHER INFORMATION

          ITEM 1. LEGAL PROCEEDINGS.

          Brooks Instrument, LLC filed two lawsuits, in one case along with their affiliate BI Products, LLC (collectively with Brooks Instrument, LLC, “Brooks”), against us in the United States District Court for the Eastern District of Texas, on April 29, 2010. Brooks also filed one lawsuit against us in the United States District Court for the District of Massachusetts on April 29, 2010. These suits were related to our digital mass flow controllers and digital pressure sensors. Brooks sought injunctive relief and damages for alleged patent infringement, breach of contract and trade secret violations. None of the lawsuits specified a specific amount of damages. We responded to the allegations to deny any wrongdoing. In addition, we filed counterclaims against Brooks in the courts where they initially brought suit against us, seeking injunctive relief and damages for alleged patent infringement by Brooks, relating to their pressure transient insensitive mass flow controllers. On February 22, 2011, the parties entered into a settlement agreement, resolving all the issues in the cases, and on February 23, 2011, the parties filed stipulated dismissals with the appropriate courts.

          We are subject to various other legal proceedings and claims, which have arisen in the ordinary course of business.

          In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on our results of operations, financial condition or cash flows.

          ITEM 1A. RISK FACTORS.

          Information regarding risk factors affecting the Company’s business are discussed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 in the section entitled “Risk Factors.” There have been no material changes from the risks disclosed therein.

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ITEM 6. EXHIBITS.

Exhibit No.	Exhibit Description
3.1(1)	Restated Articles of Organization
3.2(2)	Articles of Amendment, as filed with the Secretary of State of Massachusetts on May 18, 2001
3.3(3)	Articles of Amendment, as filed with the Secretary of State of Massachusetts on May 16, 2002
3.4(4)	Amended and Restated By-Laws
31.1	Certification of Principal Executive Officer pursuant to Rule 13a-14(a)/Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended
31.2	Certification of Principal Financial Officer pursuant to Rule 13a-14(a)/Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended
32.1	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	The following materials from MKS Instruments, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, formatted in XBRL (Extensible Business Reporting Language):
	(i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statements of Cash Flows, and (iv) Notes to Unaudited Consolidated Financial Statements, tagged as blocks of text.

(1)	Incorporated by reference to the Registration Statement on Form S-4 (File No. 333-49738) filed with the Securities and Exchange Commission on November 13, 2000.
(2)	Incorporated by reference to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2001.
(3)	Incorporated by reference to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2002.
(4)	Incorporated by reference to the Registration Statement on Form S-1 filed with the Securities and Exchange Commission on January 28, 1999, as amended.

SIGNATURE

          Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	MKS INSTRUMENTS, INC.
May 6, 2011	By:	/s/ Seth H. Bagshaw
		Seth H. Bagshaw
		Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

24

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
PURSUANT TO RULE 13a-14(a)/RULE 15d-14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Leo Berlinghieri, certify that:

1.	I have reviewed this Quarterly Report on Form 10-Q of MKS Instruments, Inc.;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 6, 2011	/s/ Leo Berlinghieri
	Leo Berlinghieri
	Chief Executive Officer and President (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER
PURSUANT TO RULE 13a-14(a)/RULE 15d-14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Seth H. Bagshaw, certify that:

1.	I have reviewed this Quarterly Report on Form 10-Q of MKS Instruments, Inc.;
2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;
3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;
4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and
b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 6, 2011	/s/ Seth H. Bagshaw
	Seth H. Bagshaw
	Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

          In connection with the Quarterly Report on Form 10-Q of MKS Instruments, Inc. (the “Company”) for the period ended March 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Leo Berlinghieri, Chief Executive Officer and President of the Company, and Seth H. Bagshaw, Vice President, Chief Financial Officer and Treasurer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, based on his knowledge:

(1)	the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2)	the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: May 6, 2011	/s/ Leo Berlinghieri
	Leo Berlinghieri
	Chief Executive Officer and President
Dated: May 6, 2011	/s/ Seth H. Bagshaw
	Seth H. Bagshaw
	Vice President, Chief Financial Officer and Treasurer