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
Walmart reopens 4 closed Supercenters
Gallery: Walmart, Kroger, Target lead Kantar's 2015 PoweRanking