BigCommerce Results Presentation Deck

Mid market strength and up market progress into enterprise segment driving steady growth in ARPA over time (as of 3/31/23) B 5 +27% YoY $21.0k Q1 +25% $21.9k Q2 +24% $23.2k 2019 Q3 +22% $24.4k Q4 +19% $25.1k Q1 ARPA attributable to enterprise accounts ($k) +23% $28.4k $26.9k Q2 +22% $29.9k 2020 Q3 +26% +23% $31.6k $31.4k Q4 +17% +17% $33.3k Q1 Q2 2021 Q3 +15% $34.3k Q4 +12% $35.2k Q1 +17% +11% +22% +13% $38.1k $38.9k $38.7k $39.3k Q2 Q3 2022 Q4 Note: Average revenue per account ("ARPA") for enterprise accounts is calculated at the end of a period by including customer-billed revenue and an allocation of partner and services revenue, where applicable. Q1 2023 33

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