There’s a growing interest on the part of new investors in buying residential mortgage servicing rights, but observers say a major impediment for the market is a lack of confidence that Fannie Mae and Freddie Mac will acknowledge their ownership rights. “It’s a problem,” said Tom Piercy, managing member of Interactive Mortgage Advisors, a servicing brokerage and advisory firm. “Fannie and Freddie could learn a thing or two from Ginnie.” The phrase “new investors” generally applies...