Fastly Investor Presentation Deck

fastly. Momentum-at-a-Glance At IPO (May 2019) Revenue % Average Revenue Across All Enterprise Customers* Dollar Based Net Expansion Rate** Revenue from Enterprise Customers as a % of Total Revenue Annual Revenue Retention Rate*** $145M/38% YoY For the year ended December 31, 2018 Ⓒ2021 Fastly, Inc. $530K For the year ended December 31, 2018 132% As of December 31, 2018 84% For the year ended December 31, 2018 99% As of December 31, 2018 Today $291M / 45% YoY For the year ended December 31, 2020 $782K Q4 2020 143% As of December 31, 2020 89% For the year ended December 31, 2020 99% As of December 31, 2020 * Enterprise customers are defined as customers with LTM revenue in excess of $100,000 over the previous 12-month period. ** We calculate Dollar Based Net Expansion Rate by dividing the revenue for a given period from customers who remained customers as of the last day of the given period (the "current period") by the revenue from the same customers for the same period measured one year prior (the "base period"). The revenue included in the current period excludes revenue from (i) customers that churned after the end of the base period and (ii) new customers that entered into a customer agreement after the end of the base period. ***We separately monitor customer retention and churn on an annual basis by measuring our annual revenue retention rate, which we calculate by multiplying the final full month of revenue from a customer that terminated its contract with us (a "Churned Customer") by the number of months remaining in the same calendar year ("Annual Revenue Churn"). The quotient of the Annual Revenue Churn from all of our Churned Customers divided by our annual revenue of the same calendar year is then subtracted from 100% to determine our annual revenue retention rate

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