Klaviyo IPO Presentation Deck

GAAP to Non-GAAP reconciliation (cont'd) Non-GAAP Free Cash Flow (in thousands) Net Cash Used in Operating Activities Acquisition of Property and Equipment Capitalization of Software Development Costs Non-GAAP Free Cash Flow Revenue Net Cash Used in Operating Activities Margin Non-GAAP Free Cash Flow Margin Year Ended December 31 2021 ($22,738) (13,023) (987) ($36,748) $290,640 (7.8%) (12.6%) 2022 ($23,552) (15,821) (2,424) ($41,797) $472,748 (5.0%) (8.8%) Six Months Ended June 30 2022 ($27,142) (9,965) (941) ($38,048) $208,345 (13.0%) (18.3%) 2023 Ⓒ Klaviyo 2023 $57,026 (769) (2,836) $53,421 $320,674 17.8% 16.7% Confidential 54

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