Investor Presentaiton

Consistent Execution - 'Rule of 40' Since 2009 IPO Achieved 'Rule of 40' 9 years out of the past 12 years and expect to achieve 'Rule of 50' in 2021 Rule of 40(1) m W 49% 58% 33% 24% 20% 14% 47% 24% 44% 41% 42% 34% 35% 19% 13% 15% 16% 47% 45% 43% 23% 25% 27% 17% ~55% 26% 19% 29% 34% 23% 15% 25% 31% 26% 17% 20% 20% 20% 29% (2) (2) (2) (2) 2009 2010 2011 2012 2013(2) (2) (2) (3) 2014 2015 2016 2017 2018 2019 2020 2021E ■Revenue Growth ■Non-GAAP Operating Margin Note: Fortinet's IPO was on November 18, 2009. (1) (2) (3) O Fortinet, Inc. All Rights Reserved. Fortinet defines the Rule of 40 and Rule of 50 as GAAP revenue Y/Y growth plus Non-GAAP Operating Margin. See Appendix for reconciliation of the non-GAAP financial measures to the most comparable GAAP financial measures. 2009-2015 have not been adjusted for an immaterial error related to the commencement of revenue recognition for certain FortiCare support service contracts. Based on the midpoint of 2021 guidance provided on November 4, 2021. 5

View entire presentation