Fastly Mergers and Acquisitions Presentation Deck

Signal Sciences at a Glance भ 40,000 Apps Protected 60+ Enterprise Customers* 70% New to Fastly Ⓒ2020 Fastly, Inc. nin $28M ARR** 85%+ Gross Margin 80+ Net Promoter Score $ 96%+ Gross Retention*** * Enterprise customers are defined as customers with revenue in excess of $100,000 over the previous 12-month period. ** Annual Recurring Revenue (ARR) is defined as the aggregate value of contracted recurring revenues from subscription agreements at a point in time, excluding all non-recurring revenue, normalized to a twelve-month period *** Gross retention is calculated as the percentage of customers retained from the prior twelve-month period on a logo basis Note: All data as of June 30, 2020 9

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