Acquisitions boosted Ocwen Financial to the top subprime servicer spot at the end of 2011, according to a new ranking and analysis by Inside Nonconforming Markets. However, that was not the only significant movement among the top five subprime servicers, as American Home Mortgage Servicing changed more than its name. Ocwen serviced an $84.73 billion subprime portfolio at the end of 2011, a whopping 49.9 percent increase compared with the end of 2010. During that time, the amount of subprime mortgages outstanding decreased by 9.2 percent to an estimated $545.0 billion ... [Includes one data chart]