Walmart

2016 Revenue: $485.9 billion
One-year Revenue Change: 0.8%

Big-box retailer Walmart (wmt, +0.09%) has continued its online push in 2016, In a bid to accelerate e-commerce growth, Walmart has acquired digital-native retail companies in including ModCloth, ShoeBuy, and Moosejaw in recent years, and in 2016, in perhaps its biggest e-commerce move yet, it acquired Jet.com, for $3.3 billion. But the gulf between Walmart’s online business and that of the top online retailer, Amazon, is still daunting. While Amazon (No. 12 on this year’s list) carries some 300 million products, Walmart offers 10 million.