Amplitude Results Presentation Deck

(8 GAAP to Non-GAAP Reconciliation Reconciliation of operating expenses GAAP research and development Less: stock-based compensation expense and related employer payroll taxes¹ 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 AMPLITUDE, INC. Reconciliation of GAAP to Non-GAAP Data (In thousands, except percentages and per share amounts) (unaudited) Less: stock-based compensation expense and related employer payroll taxes¹ Less: amortization of acquired intangible assets 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 taxes¹ 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, 2023 2022 21,797 $ (9,395) 12,402 30.9% 17.6% 38,475 (8,011) (44) 30,420 54.5% 43.1% 13,997 (4,097) 9,900 19.8% 14.0% $ $ $ 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% $ $ $ $ $ Nine Months Ended September 30, 2023 67,940 $ (27,928) 40,012 33.2% 19.5% 115,934 (22,352) (131) 93,451 $ $ $ 56.6% 45.6% 40,138 $ (10,177) 29,961 19.6% 14.6% $ 2022 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% ¹ Stock-based compensation expense-related charges include employer payroll tax-related expenses on employee stock transaction © 2023 Amplitude Inc. All Rights Reserved. 21

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