Nationstar Mortgage (NSM) shares soared early Monday after it said it will pay roughly $1.3 billion to buy $215 billion in mortgage servicing assets from Bank of America (BAC). Separately, Walter Investment Management (WAC) said it will pay $519 million for a package of Bank of America loan servicing rights. The agreement covers $93 billion of Fannie Mae-backed loan servicing rights. Its stock also rose. Walter said it's signed a deal to buy