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.