Bloomberg Walmart Inc.’s battle with Amazon.com Inc. is hitting its bottom line like never before—and testing the patience of investors. The retail giant’s push to expand online operations and cut prices contributed to a record-low operating margin last quarter, according to data compiled by Bloomberg. The profit measure narrowed to 3.3 percent, sparking concerns that Walmart’s long-enviable financial cushion is …

Bloomberg Yum! Brands Inc.’s KFC warned that a supply-chain breakdown that has shut more than half of its 900 UK outlets would persist for the rest of the week, continuing to deprive fans of their fried-chicken fix. KFC said it’s working with new logistical partner Deutsche Post AG to solve a problem that began over the weekend, leaving only 430 …

Bloomberg Home Depot Inc. sales got another shot in the arm from the US housing boom last quarter, with an extra boost from hurricane-recovery efforts in Puerto Rico and Southern states. A push by Americans to fix up their properties—using money generated by rising home values—helped lift the retailer’s same-store sales by 7.5 percent. That beat analysts’ prediction of 6.5 …