Fastly Investor Presentation Deck

Strong Customer Loyalty and Retention Metrics Dollar-Based Net Expansion Rate* 132% CY 2018 136% O Ⓒ2021 Fastly, Inc. CY 2019 143% CY 2020 Annual Revenue Retention Rate** 99% CY 2018 99% CY 2019 99% CY 2020 * 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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