Walmart to close 269 stores including all 'Express' sites
Walmart increases Patti LaBelle line, adds availability tracker
Walmart marketing chief Quinn to retire
Walmart to roll out digital payment system
Disruptors 2015: Kieran Shanahan, Walmart.com
Video: Walmart's bakery goes 'pie-ral'
Analysts skeptical despite Walmart's improved 3Q
Walmart reports positive U.S. sales in 3Q