Walmart already has a huge U.S. footprint. But the retail giant sees room to get even bigger.

The company plans to build or convert more than 150 large-format stores over the next five years, it said Wednesday. Some of the locations will be expanded from a smaller location into a Supercenter with a full range of groceries and merchandise, but the majority will be new stores, Josh Havens, a company spokesman, said.

Walmart declined to say how much the new stores will cost and where they will…