Investor Presentaiton

Guidance for Q4'21 and 2021 Q4'20 Actual Q4'21 Guidance 2020 Actual 2021 Guidance Billings $960.9M $1.165-$1.215B $3.090B $4.040 - $4.090B Y/Y Mid-Pt Growth 23.8% 31.6% Revenue (GAAP) $748.0M $940 - $970M $2.594B $3.320-$3.350B Y/Y Mid-Pt Growth 27.7% 28.6% Service Revenue (GAAP) $459.6M $1.678B $2.080 - $2.090B Y/Y Mid-Pt Growth 24.3% Gross Margin 78.5% 75.0 - 76.0% 78.9% 76.5 - 77.5% Operating Margin 29.4% 27.0 - 28.0% 26.9% 25.5 - 26.5% Earnings per share $1.06 $1.10 - $1.15 $3.35 $3.85 - $3.95 As of November 4, 2021 m II W O Fortinet, Inc. All Rights Reserved. Note: Amounts above are non-GAAP except where GAAP is noted. Our guidance with respect to non-GAAP financial measures excludes stock-based compensation and amortization of acquired intangible assets. We have not reconciled our guidance with respect to non- GAAP financial measures to the corresponding GAAP measures because certain items that impact these measures are uncertain or out of our control, or cannot be reasonably predicted. Accordingly, a reconciliation of these non-GAAP financial measures to the corresponding GAAP measures is not available without unreasonable effort. 45

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