Fannie Mae and Freddie Mac each boast several thousand customers, but a disproportionate share of their business comes from only a handful of lenders. In fact, just three lenders made up half of Freddie’s business during the first half of 2006, according to an analysis by Inside The GSEs, based on data contained in the Inside Mortgage Finance Secondary Market Database. Fannie’s top 10 customers accounted for 61.6 percent of its business as of June 30...[Includes two data charts from the Inside Mortgage Finance Secondary Market Database.]