Investor Presentaiton

W II m Growing Deferred Revenue and Free Cash Flow Service Contracts Generating Free Cash Flow Deferred Revenue Free Cash Flow (1) (1) $ In Millions $1,667 $712 25% CAGR $2,109 $955 $3,106 $2,605 $1,490 $1,616 $ In Millions $908 $716 $586 $644 35% 35% 33% 32% $988 42% 2018 2019 2020 Q3'21 2018 2019 ■Current Def Rev Non-Current Def Rev 2020 Free Cash Flow Margin Q3'20 YTD Q3'21 YTD O Fortinet, Inc. All Rights Reserved. Free Cash Flow and Free Cash Flow Margin are non-GAAP financial measures. See Appendix for reconciliation of the non-GAAP financial measure to the most comparable GAAP financial measure. 42

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