Exhibit 99.1

FOR IMMEDIATE RELEASE

KLA-TENCOR REPORTS FISCAL 2016 SECOND QUARTER RESULTS

MILPITAS, Calif., January 28, 2016 - KLA-Tencor Corporation (NASDAQ: KLAC) today announced operating results for its second quarter of fiscal year 2016, which ended on December 31, 2015, and reported GAAP net income of $152 million and GAAP earnings per diluted share of $0.98 on revenues of $710 million.

A reconciliation between GAAP operating results and non-GAAP operating results is provided following the financial statements that are part of this release. Non-GAAP results include the impact of stock-based compensation, but exclude the impact of acquisitions, restructuring, severance and other related charges, merger-related charges, and debt extinguishment loss and recapitalization charges.

In light of the pending merger transaction with Lam Research Corporation, KLA-Tencor will discontinue conducting quarterly earnings conference calls to discuss financial results, but instead publish a quarterly stockholder letter and other supplemental data on the Investor Relations section of the KLA-Tencor website.

About KLA-Tencor:

KLA-Tencor Corporation, a leading provider of process control and yield management solutions, partners with customers around the world to develop state-of-the-art inspection and metrology technologies. These technologies serve the semiconductor, LED and other related nanoelectronics industries. With a portfolio of industry-standard products and a team of world-class engineers and scientists, the company has created superior solutions for its customers for nearly 40 years. Headquartered in Milpitas, California, KLA-Tencor has dedicated customer operations and service centers around the world. Additional information may be found at www.kla-tencor.com. (KLAC-F)

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Use of Non-GAAP Financial Information:

The non-GAAP and supplemental information provided in this press release is a supplement to, and not a substitute for, KLA-Tencor’s financial results presented in accordance with United States GAAP.

To supplement KLA-Tencor’s condensed consolidated financial statements presented in accordance with GAAP, the company provides certain non-GAAP financial information, which is adjusted from results based on GAAP to exclude certain costs and expenses, as well as other supplemental information. The non-GAAP and supplemental information is provided to enhance the user’s overall understanding of KLA-Tencor’s operating performance and its prospects in the future. Specifically, KLA-Tencor believes that the non-GAAP information provides useful measures to both management and investors regarding financial and business trends relating to KLA-Tencor’s financial performance by excluding certain costs and expenses that the company believes are not indicative of its core operating results. The non-GAAP information is among the budgeting and planning tools that management uses for future forecasting. However, because there are no standardized or generally accepted definitions for most non-GAAP financial metrics, definitions of non-GAAP financial metrics (for example, determining which costs and expenses to exclude when calculating such a metric) are inherently subject to significant discretion. As a result, non-GAAP financial metrics may be defined very differently from company to company, or even from period to period within the same company, which can potentially limit the usefulness of such information to an investor. The presentation of non-GAAP and supplemental information is not meant to be considered in isolation or as a substitute for results prepared and presented in accordance with United States GAAP.

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KLA-Tencor Corporation

Condensed Consolidated Unaudited Balance Sheets

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KLA-Tencor Corporation

Condensed Consolidated Unaudited Statements of Operations

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KLA-Tencor Corporation

Condensed Consolidated Unaudited Statements of Cash Flows

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KLA-Tencor Corporation

Condensed Consolidated Unaudited Supplemental Information

(In thousands, except per share amounts)

Reconciliation of GAAP Net Income to Non-GAAP Net Income

Pre-tax impact of items included in Condensed Consolidated Unaudited Statements of Operations

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To supplement our condensed consolidated financial statements presented in accordance with GAAP, we provide certain non-GAAP financial information, which is adjusted from results based on GAAP to exclude certain costs and expenses, as well as other supplemental information. The non-GAAP and supplemental information is provided to enhance the user’s overall understanding of our operating performance and our prospects in the future. Specifically, we believe that the non-GAAP information provides useful measures to both management and investors regarding financial and business trends relating to our financial performance by excluding certain costs and expenses that we believe are not indicative of our core operating results. The non-GAAP information is among the budgeting and planning tools that management uses for future forecasting. However, because there are no standardized or generally accepted definitions for most non-GAAP financial metrics, definitions of non-GAAP financial metrics (for example, determining which costs and expenses to exclude when calculating such a metric) are inherently subject to significant discretion. As a result, non-GAAP financial metrics may be defined very differently from company to company, or even from period to period within the same company, which can potentially limit the usefulness of such information to an investor. The presentation of non-GAAP and supplemental information is not meant to be considered in isolation or as a substitute for results prepared and presented in accordance with United States GAAP.

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