 Slice Intelligence, which gathers e-commerce data from receipts linked to its Slice package tracking app, tells TechCrunch that Amazon dominated online Black Friday sales, accounting for 35.7 percent in e-commerce spending on November 27. November 25th, the day before Thanksgiving, experienced 20 percent growth over the same day last year, followed by Thanksgiving Day, which posted 16 percent more sales versus Turkey Day 2014. The retailer with the most Black Friday gains was Wayfair, whose sales were a whopping 315 percent higher than Black Friday last year. “And what we’re seeing with all this Cyber Monday spending is that a lot of shopping is moving online, so retailers really need to have a handle on exactly how much they’re losing due to online checkout problems.” 
 
 And with the significant shift to online shopping, improving efficiency will matter more than ever in the years to come.
– Black Friday sales were up 7% this year over 2014 while Thanksgiving Day sales jumped 16%, according to Slice Intelligence's analysis of online sales data. Not only that, but the weeks leading up to the biggest shopping day of the year saw a 14% boost with many sales starting early, reports TechCrunch. How did individual stores fare? Amazon is clearly happy after reporting its best holiday shopping weekend ever for Amazon devices. But that's not all the site has to be cheering. Here are the five retailers with the biggest shares of online spending on Black Friday: Amazon: 35.7% Best Buy: 8.23% Macy's: 3.38% Walmart: 3.35% Nordstrom: 3.11% (Apparently people were buying a lot of guns.)