Investor Presentaiton

W II m +2% -2% Drivers of Consistent Revenue Performance Q3'18 Q3'19 Discount Rate (1) +2% Renewal Rate (1) -2% Q3'18 Q3'19 (1) Compared to +/- 2% of the 3-year trailing average. Q3'20 Q3'20 Q3'21 Q3'21 Q3'18 Q3'18 O Fortinet, Inc. All Rights Reserved. Q3'19 Average Contract Term 30 mo. Q3'20 Avg Contract Term Avg Contract Term Excl SD-WAN Percentage of Service Revenue from Deferred (1) Q3'19 Q3'20 Q3'21 33 Q3'21 +2% -2% 24 mo.

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