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. $ $ $ $ $ $ Three Months Ended December 31, 2021 14,229 $ (4,446) 9,783 $ 28.8% 19.8% 27,016 $ (5,149) 21,867 54.7% 44.2% 14,272 (5,384) $ $ 8,888 $ 28.9% 18.0% 2020 6,371 (1,099) 5,272 21.2% 17.5% 14,968 (2,328) 12,640 49.8% 42.0% 4,651 (1,071) 3,580 15.5% 11.9% $ $ $ $ $ $ Year Ended December 31, 2020 2021 48,251 (16,469) 51.4% 45.6% 31,782 28.8% 19.0% 86,025 (9,693) (13) 76,319 $ 55,370 (11,553) (18,178) 25,639 $ 33.1% 15.3% $ $ $ $ 26,098 (5,607) (518) 19,973 25.5% 19.5% 51,819 (6,549) 45,270 50.6% 44.2% 18,067 (3,902) 14,165 17.6% 13.8% ¹ Stock-based compensation expense-related charges include employer payroll tax-related expenses on employee stock transactions. 23

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