Amplitude Results Presentation Deck

GAAP to Non-GAAP Reconciliation Reconciliation of operating expenses GAAP research and development Less: stock-based compensation expense and related employer payroll taxes 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 $ $ $ $ Three Months Ended September 30, 2022 2021 21,590 $ (7,646) 13,944 35.0% 22.6% 32,528 $ (5,126) $ 27,402 52.8% 44.5% 13,610 $ (4,228) 9,382 22.1% 15.2% $ $ 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% $ $ $ $ $ $ Nine Months Ended September 30, 2022 2021 58,397 $ (19,661) 38,736 33.8% 22.4% 94,793 (11,626) 83,167 54.9% 48.1% 39,184 (11,988) 27.196 22.7% 15.7% $ $ $ $ $ 34,022 (12,023) 21,999 28.9% 18.7% 59,009 (4,544) (13) 54,452 50.1% 46.2% 41,098 (6,169) (18,178) 16,751 34.9% 14.2% Stock-based compensation expense-related charges include employer payroll tax-related expenses on employee stock transactions. Ⓒ2022 Amplitude Inc. Confidential. All Rights Reserved. 27

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