Percent of US online sales made on Amazon.com. Calculated by comparing Amazon North America Sales to U.S. E-Commerce Sales.
Amazon doesn't report Gross Merchandise Sold (GMS) value, but we estimate that marketplace sellers generate as much sales volume as Amazon itself. Thus when calculating this metric we multiply Amazon's North America Sales by 2x.
Last reported quarter 2018 Q3 it was 56.6%, up by 18% year-over-year from 47.9%.
Source: Marketplace Pulse Research.