Mr. Cooper Group, formerly WMI Holdings Corporation, is an American home loan servicer headquartered in the Dallas, Texas, area. Mr. Cooper Group specializes in residential mortgages, mortgage refinancing, home loans, and home loan refinancing. As of 2023, it was one of the largest mortgage servicers in the United States with a servicing portfolio of approximately $937 billion and more than 4.3 million customers. The company was acquired by Rocket Companies in 2025.