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 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 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 June 30, 2023 2022 22,435 (9,500) 12,935 33.1% 19.1% 38,326 (7,660) (44) 30,622 56.6% 45.2% 12,519 (2,732) 9,787 18.5% 14.4% $ $ $ $ 20,306 (7,533) 12,773 34.9% 22.0% 34,135 (3,268) 30,867 58.7% 53.1% 11,212 (2,620) 8,592 19.3% 14.8% $ S $ S $ Six Months Ended June 30, 2023 2022 46,143 (18,533) $ 27,610 $ 34.4% 20.6% 77,459 (14,341) (87) 63,031 S 57.7% 47.0% 26,141 (6,080) 20,061 19.5% 14.9% S $ $ 36,807 (12,015) 24,792 33.1% 22.3% 62,265 (6,500) 55,765 56.0% 50.2% 25,574 (7,760) 17,814 23.0% 16.0% 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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