Amplitude IPO Presentation Deck

Dollar-Based Net Retention Rate (NRR) 116% 119% 119% FY2019 FY2020 FY2021'H1 We calculate Dollar-Based Net Retention rate as of a period end by starting with the ARR from the cohort of all customers as of 12 months prior to such period-end (the "Prior Period ARR"). We then calculate the ARR from these same customers as of the current period-end (the "Current Period ARR"). Current Period ARR includes any expansion and is net of contraction or attrition over the last 12 months, but excludes ARR from new customers as well as any overage charges in the current period. We then divide the total Current Period ARR by the total Prior Period ARR to arrive at the point-in-time dollar-based net retention rate. We then calculate the weighted average of the trailing 12-month point-in-time dollar-based not retention rates to arrive at the dollar-based net retention rate

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