The nation’s subservicers increased their base of contracts to $1.615 trillion in the second quarter, a modest 1.6 percent gain from the prior period, but a handsome 17.0 percent improvement from the same period a year earlier, according to survey figures compiled by Inside Mortgage Finance. Overall, these third-party processing vendors – who split the monthly fee with the actual owner of the servicing strip – control 15.9 percent of all residential mortgage debt in the nation. A year ago the reading was 14.0 percent. And it’s...[Includes one data table]