They are big. For short they also own o.co which directs to overstock. They currently sponsor a multi purpose stadium named 0.com. the MLB, NFL, and MLS have

They are big. For short they also own o.co which directs to overstock. They currently sponsor a multi purpose stadium named 0.com. the MLB, NFL, and MLS have a team that play there. side note: noticeable brands that sponser a American stadium: BofA, Gillette, Qualcomm,FedEx, AT&T, Mercedes-Benz.