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.

The announcement comes as the Cincinnati, Ohio-based retailer has been looking for ways to bulk up its supply chain to compete with the likes of Walmart, Amazon, which now owns Whole Foods, and Target. These companies are each looking for ways to get orders to customers more quickly and efficiently. Kroger has been primarily focused of late on perfecting its curbside pickup service, known as ClickList.

Target acquired Shipt to begin offering same-day delivery on grocery and household items. Walmart has said it plans to bring its grocery delivery platform to 800 of its stores by year’s end. And Amazon is slowly using its own network of resources to bring Whole Foods delivery to major metros in New York and Florida, moving away from Whole Foods’ partnership with Instacart.

Kroger said its new Ship service will eventually roll out “to additional markets over the next few months.”

Customers can shop online and receive free doorstep delivery on orders of more than $35, or pay a fee of $4.99 per order for smaller orders, the company said. First-time customers will receive free shipping with no minimum purchase required, and 15 percent off their order with a one-time-use discount code.

Kroger Ship customers will also have access to 4,500 products that aren’t available anywhere else on, along with more than 50,000 groceries and household products, the company said in a statement.

Shares of Kroger have climbed more than 5 percent so far this year to trade around $29. The company has a market cap of roughly $23.1 billion, compared with Walmart, which has a market cap of $263.3 billion, and Target, which is valued at $43 billion.

Source: CNBC