Amazon could be responsible for about half of 2017 US e-commerce sales

Amazon held 38 percent market share, or $149 billion in sales, in 2016, and it remains the biggest e-commerce company. It is followed distantly by eBay, Apple and Walmart.

Note that this data doesn’t include sales from private companies like Stitch Fix, the personal styling online retailer that filed to go public last week, so these companies’ true market share is likely smaller.

E-commerce sales are a small but rapidly growing share of U.S. retail, and Amazon is by far the leader. Amazon now represents close to 4 percent of all retail sales online and off in the U.S., according to eMarketer. E-commerce sales will increase 15.8 percent to $452.8 billion by the end of 2017, according to the research firm’s estimates.

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This article originally appeared on Recode.