Investor Presentaiton

Additional Modeling Points As of November 4, 2021 W II Cash Paid for Taxes Capital Expenditures Non-GAAP Tax Rate m Shares Outstanding Q4'21 Guidance 2021 Guidance $170 - $190M ~$130M $315 $335M - 21% 21% 168 - 170M 167-169M O Fortinet, Inc. All Rights Reserved. Note: In order to provide a more complete picture of our recurring core business operating results, we include in non-GAAP net income and non-GAAP diluted net income per share, the tax adjustment required resulting in an effective tax rate on a non-GAAP basis, which often differs from the GAAP tax rate. 46

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