Total U.S. retail sales growth stood at 14.4%, according to a Digital Commerce 360 analysis of U.S. Department of Commerce data. Meanwhile, total U.S. ecommerce sales growth hit 17.8% But the Top 100 U.S.-based online marketplaces beat that performance.

They recorded 18.7% growth in total GMV in 2021 to reach a record high of $917.79. (Total gross merchandise value, or GMV, includes first- and third-party merchant sales.)

And it was third-party sellers that drove that rise. Third-party GMV on the Top 100 U.S. marketplaces rose a whopping 22.4%.