Nationstar Mortgage’s servicing portfolio has grown significantly in the past year due to acquisitions from banks, a trend the company’s officials suggest will continue. “There is significant room for market penetration as larger banks dispose of servicing assets,” the nonbank servicer said in a recent presentation to investors. Nationstar is touting its growth prospects even after increasing its servicing portfolio to $102.7 billion at the end of the third quarter of 2011 from $12.7 billion at the end of 2007. The company owns 49.2 percent of the holdings, with the rest being subserviced for others ...