walmart inc the engine of the world’s largest family fortune is missing out on the stockmarket rally that has propelled rivals to record highs this year veteran watchers of the mighty retailer are struggling to understand why the share price has risen just 1 this year through wednesday while the sp 500 index has advanced 25 that is walmart’s worst lag compared with us stocks since 2015 and the gap is wider still with other large retailers target corp has jumped 34 this year and costco wholesale corp is up 50 home depot inc has surged 54 in a rally that lifted its market value above walmart’s last month