Results of Operations The following tables set forth our results of operations for the periods presented. Three Months Ended March 31, 2022 2021 (in thousands) Revenue: Platform $ 41,466 $ 34,923 Professional services and other 1,290 1,200 Total revenue 42,756 36,123 Cost of revenue: Platform 11,024 5,607 Professional services and other 1,778 1,243 Total cost of revenue 12,802 6,850 Gross Profit 29,954 29,273 Operating expenses: Research and development 16,825 14,456 General and administrative 17,961 18,454 Sales and marketing 8,070 3,836 Total operating expenses 42,856 36,746 Loss from operations (12,902) (7,473) Other income (expenses), net: Other income (expense), net 58 (18) Change in fair value of warrant liability — (18,930) Total other income (expenses), net 58 (18,948) Loss before income taxes (12,844) (26,421) (Benefit) provision for income taxes (1,335) 36 Net loss and comprehensive loss (11,509) (26,457) Accretion of redeemable convertible preferred stock to redemption value — (14) Net loss attributable to Class A and Class B common stockholders $ (11,509) $ (26,471) Three Months Ended March 31, 2022 2021 Cost of revenue - platform $ 1,470 $ 436 Cost of revenue - professional services and other 210 115 Research and development 3,398 3,452 General and administrative 5,038 3,858 Sales and marketing 1,592 388 Total stock-based compensation expense $ 11,708 $ 8,249 (2) (2) (2) (2) (1) (2) (1) Includes charitable donation expense of $5.1 million for the three months ended March 31, 2021. (2) Includes stock-based compensation expense as follows: 29