Some lenders relied a lot more heavily on the refi market than others. Among the top 50 GSE loan sellers, CitiMortgage, Provident Funding Associates, Quicken Loans, Sovereign Bank and Colorado Federal Savings Bank all got more than 90 percent of their Fannie/Freddie loans from refinance transactions. With the exception of Quicken Loans, all of these lenders also got...[Includes one data chart and one graph]