Investor Presentaiton

Reconciliation of Non-GAAP Results to GAAP Results m W $ in millions 2018 2019 2020 Q3'19 Q3'20 Q3'21 GAAP operating income $234.4 $351.0 $531.8 $100.6 $126.9 $166.4 GAAP operating margin 13% 16% 21% 18.4% 19.5% 19.2% Stock-based compensation 162.9 174.1 193.8 42.4 50.0 53.5 Amortization of acquired intangible assets 9.0 10.9 13.3 2.2 2.8 4.8 Litigation settlement expenses (0.7) Gain on IP matter (40.2) (1.1) (1.1) Non-GAAP operating income $406.3 $536.0 Non-GAAP operating margin 23% 25% $698.0 27% $145.2 $178.6 $223.6 26.5% 27.4% 25.8% O Fortinet, Inc. All Rights Reserved. 56 56

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