Pingora Asset Management is trying to raise $500 million of additional capital to buy mortgage servicing rights from eager sellers. If successful, it will bring the young company’s investment in residential receivables up to $1 billion. According to new figures compiled by Inside Mortgage Finance, Pingora owned $25.38 billion of Fannie Mae/Freddie Mac residential servicing rights at yearend, ranking 24th among all servicers. Three years ago, it didn’t even exist. Company founder and Chief Executive Michael Lau was said...