KEY POINTS
  • The service will eventually roll out "to additional markets over the next few months," Kroger said.
  • Kroger Ship offers customers access to 4,500 products that aren't available anywhere else on Kroger.com, according to the company.
  • Walmart, Target and Amazon, which owns Whole Foods, are each trying to bulk up their own delivery services.

Kroger on Wednesday launched grocery delivery service "Kroger Ship" in four U.S. cities: Cincinnati, Houston, Louisville and Nashville.

Shares of Kroger rose around 1 percent in premarket trading following the announcement.