https://www.cnbc.com/2018/07/17/amazon-shares-rebound-report-says-prime-day-sales-up-from-last-year.html > Shares of Amazon rebounded Tuesday afternoon after a report said Prime Day sales on the e-tailer's third-party marketplace were up nearly 90 percent during the first 12 hours of the event from a year ago. > That's according to Feedvisor, an algorithmic pricing and business intelligence platform for online retailers, which monitors purchases made on Amazon's Marketplace. Revenues from third parties account for roughly two-thirds of Amazon's sales overall, with the rest going to Amazon's in-house brands.