Amplitude Results Presentation Deck

A GAAP to Non-GAAP Reconciliation © 2021 Amplitude Inc. All rights reserved. Reconciliation of operating expenses GAAP research and development Less: stock-based compensation expense and employer taxes on NSOs 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 employer taxes on NSOs 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 employer taxes on NSOs 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 Reconciliation of operating loss and operating margin GAAP loss from operations Plus: stock-based compensation expense and employer taxes on NSOS Plus: amortization of acquired intangible assets Plus: direct listing expenses Non-GAAP loss from operations GAAP operating margin Non-GAAP adjustments Non-GAAP operating margin Three Months Ended June 30, 2021 2020 S S S S S S S 8,544 S (1,196) S 7,348 S 21.8% 18.7% 20,040 S (870) (13) 19,157 S 51.1% 48.8% 8,282 S (773) (2,073) 5,436 S 21.1% 13.8% (9,747) S 3,086 429 2,086 8,486 (3,675) (224) 4,587 35.8% 19.4% 14,193 (3,316) 10,877 59.9% 45.9% 5,354 (2,304) 3,050 22.6% 12.9% (11,547) 9,409 224 (4,146) S (1,914) (24.8%) (48.7%) 14.3% 40.7% (10.5%) (8.0%) ¹ Stock-based compensation expense-related charges include employer payroll tax-related expenses on employee stock transactions. 19

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