(MKS LOGO)

EXHIBIT 99.1

MKS Instruments Reports Q2 2016 Financial Results

Quarterly revenue of $326 million
GAAP net income of $9.2 million, or $0.17 per diluted share
Non-GAAP net earnings of $38.7 million, or $0.72 per diluted share

Andover, Mass., July 27, 2016 — MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of technologies that enable advanced processes and improve productivity, reports today second quarter 2016 financial results.

“We had a very strong second quarter driven by positive business trends in the semiconductor market as well as in other advanced markets we serve,” said Gerald Colella, Chief Executive Officer and President. On a pro-forma basis, sales were $359 million, an increase of 9% from $330 million in the first quarter of 2016.

Mr. Colella added, “Our second quarter performance demonstrates the accretion potential of our combination with Newport. We are excited about the capabilities of a broader suite of highly precise technology-enabling solutions that address the difficult technological challenges our customers face. Our integration is on track and we are on schedule to realize $35 million of annualized cost synergies.”

“During the second quarter, we introduced a combined target operating model to reflect the acquisition of Newport, our recent favorable debt repricing and a $50 million principal repayment,” said Seth Bagshaw, Vice President and Chief Financial Officer. “At illustrative annual revenue of approximately $1.4 billion, and on a fully synergized basis, at this target operating model, the combined company is expected to generate non-GAAP gross margins of 45% to 47%, non-GAAP operating margins of 18% to 20%, and non-GAAP EPS of $2.97 to $3.35 on 54 million shares outstanding.”

Sales in the second quarter were $326 million, which included two months of results from the company’s acquisition of Newport which closed on April 29, 2016. Second quarter Net Income of $9.2 million included amortization of intangible assets of $8.9 million and aggregate acquisition and integration-related costs of $20 million associated with the acquisition. Non-GAAP Net Earnings were $38.7 million, or $0.72 per diluted share.

The Company had $426 million in cash and short-term investments as of June 30^th, $730 million outstanding under its term loan, and during the quarter paid a dividend of $9.1 million or $0.17 per diluted share.

Third Quarter Outlook

Based on current business levels, we expect that sales in the third quarter of 2016 may range from $345 to $385 million, and at these volumes, our non-GAAP net earnings could range from $0.64 to $0.86 per diluted share and GAAP net income could range from $0.36 to $0.60 per diluted share.

Segment Results

In conjunction with the acquisition of Newport, the Company is reporting its results in two business segments: Vacuum and Analysis, and Light and Motion.

Vacuum and Analysis provides a broad range of instruments, components, subsystems and software which are derived from our core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control and information technology, ozone generation and delivery, RF & DC power, reactive gas generation, and vacuum technology.

Light and Motion provides a broad range of instruments, components and subsystems which are derived from our core competencies in lasers, photonics, sub-micron positioning, vibration isolation, and optics.

Conference Call Details

A conference call with management will be held on Thursday, July 28, 2016 at 8:30 a.m. (Eastern Time). To participate in the conference call, please dial (877) 212-6076 for domestic callers and (707) 287-9331 for international callers, and an operator will connect you. Participants will need to provide the operator with the Conference ID of 37647857, which has been reserved for this call. A live and archived webcast of the call will be available on the company’s website at www.mksinst.com.

About MKS Instruments

MKS Instruments, Inc. is a 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. Our products are derived from our core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control and information technology, ozone generation and delivery, RF & DC power, reactive gas generation, vacuum technology, lasers, photonics, sub-micron positioning, vibration isolation, and optics. Our primary served markets include semiconductor capital equipment, general industrial, life sciences, and research. Additional information can be found at www.mksinst.com.

Use of Non-GAAP Financial Results

Non-GAAP amounts exclude amortization of acquired intangible assets, costs associated with completed and announced acquisitions, acquisition integration costs, sale of previously written down inventory, restructuring charges, fees and expenses related to repricing of term loan, amortization of deferred financing charges, discrete tax benefits and charges, and the related tax effect of these adjustments. These non-GAAP measures are not in accordance with Accounting Principles Generally Accepted in the United States of America (GAAP). MKS’ management believes the presentation of these non-GAAP financial measures is useful to investors for comparing prior periods and analyzing ongoing business trends and operating results. Pro forma revenue amounts assume the acquisition of Newport had occurred as of the beginning of the first quarter of 2016.

SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS

This release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 regarding the future financial performance of MKS, MKS’ future business prospects, MKS’ future growth, and MKS’ expected synergies and cost savings from its recent acquisition of Newport Corporation. These statements are only predictions based on current assumptions and expectations. Actual events or results may differ materially from those in the forward-looking statements set forth herein. Among the important factors that could cause actual events to differ materially from those in the forward-looking statements are the conditions affecting the markets in which MKS operates, including the fluctuations in capital spending in the semiconductor industry, and other advanced manufacturing markets, fluctuations in net sales to MKS’ major customers, the ability of MKS Instruments to successfully integrate Newport Corporation’s operations and employees, unexpected costs, charges or expenses resulting from the Newport acquisition, the terms of the financing incurred in connection with the Newport acquisition, MKS’ ability to realize anticipated synergies and cost savings from the Newport acquisition, MKS’ ability to successfully grow Newport Corporation’s business, potential adverse reactions or changes to business relationships resulting from the Newport acquisition, potential fluctuations in quarterly results, the challenges, risks and costs involved with integrating the operations of any other acquired companies, dependence on new product development, rapid technological and market change, acquisition strategy, manufacturing and sourcing risks, volatility of stock price, international operations, financial risk management, and the other factors described in MKS’ most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q filed with the SEC and in Newport Corporation’s Annual Report on Form 10-K for the year ended January 2, 2016 filed with the SEC. MKS is under no obligation to, and expressly disclaims any obligation to, update or alter its forward-looking statements, whether as a result of new information, future events or otherwise after the date of this press release.

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Company Contact: Seth H. Bagshaw
Vice President, Chief Financial Officer and Treasurer
Telephone: 978.645.5578

Investor Relations Contact: Monica Gould
The Blueshirt Group
Telephone: 212.871.3927
Email: monica@blueshirtgroup.com

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MKS Instruments, Inc.

Unaudited Consolidated Statements of Operations
(In thousands, except per share data)

Note 1: We recorded $8.2 million and $2.5 million of acquisition costs during the three months ended June 30, 2016 and March 31, 2016, respectively, related to the Newport Corporation acquisition, which closed during the second quarter of 2016.

Note 2: We recorded $10.1 million in cost of sales during the three months ended June 30, 2016 related to the step-up of inventory to fair value as a result of the Newport Corporation acquisition. This is being charged to cost of sales over inventory turns of three months.

Note 3: We recorded $0.7 million of fees and expenses during the three months ended June 30, 2016 related to the repricing of our Term Loan Credit Agreement.

Note 4: We recorded $1.6 million of additional interest expense during the three months ended June 30, 2016 related to the amortization of debt issuance costs affiliated with our Term Loan Credit Agreement and ABL Facility.

Note 5: We recorded $11.9 million of integration costs during the three months ended June 30, 2016 related to the Newport Corporation acquisition.

Note 6: We recorded $0.2 million of restructuring costs during the three months ended June 30, 2015 related to the outsourcing of an international manufacturing operation.

Note 7: Cost of sales for the three months ended June 30, 2015, include the reversal of a special charge of $2.1 million for obsolete inventory, which was subsequently sold.

Note 8: The Non-GAAP net earnings and Non-GAAP net earnings per share amounts exclude acquisition costs, an inventory step-up adjustment related to the acquisition of Newport Corporation, fees and expenses related to the repricing of a term loan credit agreement, amortization of debt issuance costs, integration costs related to the acquisition of Newport Corporation, restructuring costs, the reversal of certain previously written off inventory items that were subsequently sold, amortization of intangible assets and the related tax effect of these adjustments to reflect the expected full year effective tax rate in the related period.

Note 9: The Non-GAAP income from operations and Non-GAAP operating margin percentages exclude acquisition costs, an inventory step-up adjustment related to the acquisition of Newport Corporation, fees and expenses related to the repricing of a term loan credit agreement, integration costs related to the acquisition of Newport Corporation, restructuring costs, the reversal of certain previously written off inventory items that were subsequently sold and amortization of intangible assets.

Note 10: The Non-GAAP gross profit amounts and Non-GAAP gross profit percentages exclude an inventory step-up adjustment related to an acquisition and the reversal of certain previously written off inventory items that were subsequently sold.

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MKS Instruments, Inc.
Unaudited Consolidated Statements of Operations
(In thousands, except per share data)

Note 1: We recorded $10.7 million of acquisition costs during the six months ended June 30, 2016 related to the Newport Corporation acquisition, which closed during the second quarter of 2016. We recorded $0.03 million of acquisition costs during the six months ended June 30, 2015 related to the Precisive LLC acquisition, which closed during the first quarter of 2015.

Note 2: We recorded $10.1 million in cost of sales during the six months ended June 30, 2016 related to the step-up of inventory to fair value as a result of the Newport Corporation acquisition. This is being charged to cost of sales over inventory turns of three months.

Note 3: We recorded $0.7 million of fees and expenses during the six months ended June 30, 2016 related to the repricing of our Term Loan Credit Agreement.

Note 4: We recorded $1.6 million of amortization expense during the six months ended June 30, 2016 related to the amortization of debt issuance costs affiliated with our Term Loan Credit Agreement and ABL Facility.

Note 5: We recorded $11.9 million of integration costs during the six months ended June 30, 2016 related to the Newport Corporation acquisition.

Note 6: We recorded $1.0 million of restructuring costs during the six months ended June 30, 2015 related to the outsourcing of an international manufacturing operation.

Note 7: Cost of sales for the six months ended June 30, 2015, include the reversal of a special charge of $2.1 million for obsolete inventory, which was subsequently sold.

Note 8: The Non-GAAP net earnings and Non-GAAP net earnings per share amounts exclude acquisition costs, an inventory step-up adjustment related to the acquisition of Newport Corporation, fees and expenses related to the repricing of a term loan credit agreement, amortization of debt issuance costs, integration costs related to the acquisition of Newport Corporation, restructuring costs, the reversal of certain previously written off inventory items that were subsequently sold, amortization of intangible assets and the related tax effect of these adjustments to reflect the expected full year effective tax rate in the related period.

Note 9: The Non-GAAP income from operations and Non-GAAP operating margin percentages exclude acquisition costs, an inventory step-up adjustment related to the acquisition of Newport Corporation, fees and expenses related to the repricing of a term loan credit agreement, integration costs related to the acquisition of Newport Corporation, restructuring costs, the reversal of certain previously written off inventory items that were subsequently sold and amortization of intangible assets.

Note 10: The Non-GAAP gross profit amounts and Non-GAAP gross profit percentages exclude an inventory step-up adjustment related to the acquisition of Newport Corporation and the reversal of certain previously written off inventory items that were subsequently sold.

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MKS Instruments, Inc.
Reconciliation of GAAP Income Tax Rate to Non-GAAP Income Tax Rate
(In thousands)

Note 1: We recorded $8.2 million and $10.7 million of acquisition costs during the three and six months ended June 30, 2016, respectively and $2.5 million during the three months ended March 31, 2016 related to the Newport Corporation acquisition, which closed during the second quarter of 2016.

Note 2: We recorded $10.1 million of amortization expense during the three and six months ended June 30, 2016 related to the step-up of inventory to fair value as a result of the Newport Corporation acquisition.

Note 3: We recorded $0.7 million of fees and expenses during the three and six months ended June 30, 2016 related to the repricing of our Term Loan Credit Agreement.

Note 4: We recorded $1.6 million of additional interest expense during the three and six months ended June 30, 2016 related to the amortization of debt issuance costs affiliated with our Term Loan Credit Agreement and ABL Facility.

Note 5: We recorded $11.9 million of integration costs during the three and six months ended June 30, 2016 related to the Newport Corporation acquisition.

Note 6: We recorded $0.2 million and $1.0 million of restructuring costs during the three and six months ended June 30, 2015, respectively, related to the outsourcing of an international manufacturing operation.

Note 7: Cost of sales for the three and six months ended June 30, 2015, include the reversal of a special charge of $2.1 million for obsolete inventory, which was subsequently sold.

MKS Instruments, Inc.
Reconciliation of Q3-16 Guidance — GAAP Net Income to Non-GAAP Net Earnings
(In thousands, except per share data)

Note 1: The Non-GAAP adjustments are tax effected at the applicable statutory rates.

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MKS Instruments, Inc.
Unaudited Consolidated Balance Sheet
(In thousands)

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