Investor Presentaiton

Reconciliation of Non-GAAP Results to GAAP Results m W $ in millions 2018 GAAP product gross profit $383.4 2019 $463.9 2020 $564.0 Stock-based compensation 1.5 1.5 1.6 Amortization of acquired intangible assets 6 6.5 4.7 Non-GAAP product gross profit $390.9 $471.9 $570.3 Non-GAAP product gross margin 58.0% 59.9% 62.2% $ in millions 2018 2019 2020 GAAP service gross profit $970.8 $1,193.2 $1460.4 Stock-based compensation 10.8 11.3 12.9 Amortization of acquired intangible assets 0.2 1.2 4.4 Non-GAAP service gross profit $981.8 $1,205.7 1,477.7 Non-GAAP service gross margin 86.9% 87.7% 88.1% O Fortinet, Inc. All Rights Reserved. 54

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