KLA Investor Day Presentation Deck

Reconciliation of Non-GAAP Financial Measures Explanation of Non-GAAP Financial Measures: 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, including non-GAAP net income attributable to KLA, non-GAAP net income per diluted share attributable to KLA, non-GAAP R&D expenses, non-GAAP gross margin, non-GAAP operating margin, non-GAAP operating expenses, Free Cash Flow, FCF Conversion and FCF Margin, 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 to help investors compare our operating performances with our results in prior periods as well as with the performance of other companies. 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 are inherently subject to significant discretion (for example, determining which costs and expenses to exclude when calculating such a metric). 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. The following are descriptions of the adjustments made to reconcile GAAP net income attributable to KLA to non-GAAP net income attributable to KLA: a) Acquisition-related charges primarily include amortization of intangible assets and other acquisition- related adjustments including adjustments for the fair valuation of inventory and backlog, and transaction costs associated with our acquisitions. b) Restructuring, severance and other charges primarily include costs associated with employee severance, acceleration of certain stock-based compensation arrangements, charges related to liquidation of legal entities and other exit costs. c) Debt extinguishment loss in the twelve months ended December 31, 2020 includes a pre-tax loss on early extinguishment of the $500 million 4.125% Senior Notes due in November 2021. Debt extinguishment loss and recapitalization charges in the twelve months ended December 31, 2014 includes a pre-tax loss on early extinguishment of debt related to the 6.900% Senior Notes due in 2018, net and certain other expenses incurred in connection with the leveraged recapitalization plan which was completed in the quarter ended December 31, 2014. d) Goodwill impairment includes non-cash expense recognized as a result of the company's annual testing for goodwill impairment performed in the third quarter of the fiscal year. The impairment charge resulted from the downward revision of financial outlook for the acquired Orbotech business as well as the impact of elevated risk and macroeconomic slowdown driven by the COVID-19 pandemic. e) Merger-related charges associated with the terminated merger agreement between KLA-Tencor and Lam Research Corporation ("Lam") primarily include employee retention-related expenses, legal expenses and other costs. f) Restatement related charges include legal and other expenses related to the investigation regarding the company's historical stock option granting process and related stockholder litigation and other matters. KLA has paid or reimbursed legal expenses incurred by a number of its current and former directors, officers and employees in connection with the investigation of the company's historical stock option practices and the related litigation and government inquiries. g) Income tax effect of non-GAAP adjustments includes the income tax effects of the excluded items noted above. h) Discrete tax items consist of consist of certain income tax expenses/benefits that, by excluding, help investors compare our operating performance with our results in prior periods as well as with the performance of other companies. KLA# Investor Day 142

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