Amplitude Results Presentation Deck

A GAAP to Non-GAAP Reconciliation Reconciliation of operating expenses GAAP research and development Less: stock-based compensation expense and related employer payroll taxes Less: amortization of acquired intangible assets Non-GAAP research and development GAAP research and development as percentage of revenue Non-GAAP research and development as percentage of revenue GAAP sales and marketing Less: stock-based compensation expense and related employer payroll taxes Less: direct listing expenses Non-GAAP sales and marketing GAAP sales and marketing as percentage of revenue Non-GAAP sales and marketing as percentage of revenue GAAP general and administrative Less: stock-based compensation expense and related employer payroll taxes Less: direct listing expenses Non-GAAP general and administrative GAAP general and administrative as percentage of revenue Non-GAAP general and administrative as percentage of revenue Note: Certain figures may not sum due to rounding © 2021 Amplitude Inc. All rights reserved. $ S $ Three Months Ended September 30, 2021 2020 18,493 $ (9,894) 8,599 40.7% 18.9% 22,199 (2,835) 19,364 48.8% 42.6% 27,567 (4,776) (16,052) 6,739 60.6% 14.8% $ $ $ S $ 5,586 (522) (227) 4,837 21.2% 18.3% 11,482 (509) 10,973 43.5% 41.6% 3,918 (265) 3,653 14.9% 13.9% ¹ Stock-based compensation expense-related charges include employer payroll tax-related expenses on employee stock transactions. 22

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