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

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 gross margin and Free Cash Flow, 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, interest expense on unrecognized tax benefits, charges related to liquidation of legal entities and other exit costs.

c.     Income tax effect of non-GAAP adjustments includes the income tax effects of the excluded items noted above.

d.    Discrete tax items in the three months ended June 30, 2022 include an increase in unrecognized tax benefits related to the transition tax on accumulated foreign earnings from the Tax Cuts and Jobs Act. Discrete tax items in the three months ended Mar. 31, 2022 include a tax impact relating to the amortization of certain intellectual property as a result of an internal restructuring of ownership rights to align with how our business operates. Discrete tax items in the twelve months ended June 30, 2022 primarily include the aforementioned items as well as a one-time tax benefit of $394.5 million resulting from changes made to our international structure to better align ownership of certain intellectual property rights with how our business operates and a net benefit of $69.2 million from an internal restructuring, partially offset by a tax expense of $163.7 million from an increase in deferred tax liabilities on unremitted foreign earnings due to a change in tax law. Discrete tax items in the three and twelve months ended June 30, 2021 include tax expense from an increase in deferred tax liability on purchased intangibles relating to an increase in the United Kingdom statutory income tax rate, partially offset by a net tax benefit from an internal restructuring and a reduction in unrecognized tax benefits.