Investor Presentaiton

Billings Growth Accelerating to -32% Y/Y in 2021 Service Billings Account for ~69% of Total Billings $ in Millions m W $2,153 $674 $1,479 2018 -69% +32% y/y ~$4,065 CAGR (2018 to 2021E) Services 24% Products 23% 24% CAGR $3,090 ~$1,250 $2,603 2019 Service Billings $916 I I ~$2,815 -69% $2,174 2020 Product Revenue (1) 2021E (1) Based on the midpoint of 2021 guidance provided on November 4, 2021. O Fortinet, Inc. All Rights Reserved. Note: Total Billings is a non-GAAP financial measure, further categorization is derived from invoiced amounts. See Appendix for reconciliation of the non-GAAP financial measure to the most comparable GAAP financial measure. 25 25

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