BigCommerce Investor Day Presentation Deck

4 4 B FINANCIALS Success of U.K. expansion investment drives confidence in ROI of international growth efforts Depending on investment level, international expansion payback has been 18-30 months UK reached 50%+ of EMEA revenue in 2021 behind this investment EMEA revenue grew 68% in '20 and 68% in '21 Local sales teams focus on enterprise accounts and partners $ million $25.0 $20.0 $15.0 $10.0 $5.0 $0.0 $(5.0) 2018 -$1M contribution 2019 -$2M contribution UK COR + S&M UK revenue $OM contribution Source: company estimates. "UK COR + S&M" includes estimated UK cost of revenue and Sales & Marketing expenses. It does not include allocated R&D or G&A spending. 2020 N UK contribution 2021 +$2M contribution

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