Mobile & retail in the US

"Three of the five major retailers with the largest proportion of mobile-only audiences are traditional chains.
Half of Target's 48 million online shoppers last month accessed the retailer solely via the mobile Web and apps. In June 2013, only 37% of Target's online audience was mobile-only. BI Intelligence found that Target saw the biggest bump in mobile-only usage of all the major retailers tracked by comScore.
Thirty-nine percent (12 million) of Best Buy's 30 million online shoppers were mobile-only in January, compared to 35% in June 2013.
Thirty-eight percent (22 million) of Wal-Mart's 57 million digital shoppers last month came by way of mobile devices, compared to 33% in June 2013."

Source:  Business Insider, 26th February 2014