Investor Presentaiton

Strategic Investments and Capital Allocation Focused on Internally Building an Integrated Platform and Total Shareholder Return Innovation: ~$1.4B since 2017 $1.2B spent on R&D (1) Capital Return: ~$2.3B since 2017 Repurchased 29.4M Shares for $2.1B (2) W II m (1) (2) M&A 13% R&D 87% M&A 8% Share Repurchases 92% O Fortinet, Inc. All Rights Reserved. This represents our non-GAAP research and development expense from January 1, 2017 through September 30, 2021. See Appendix for reconciliation of the non-GAAP financial measure to the most comparable GAAP financial measure. Shares repurchased from January 1, 2017 through September 30, 2021. 43

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