Lenders took an average pre-tax loss of $645 per loan originated in the first quarter compared with an average loss of $2,109 per loan in the previous quarter.
Those opposed include the American Bankers Association, the Housing Policy Council, the Securities Industry and Financial Markets Association, the Structured Finance Association and U.S. Mortgage Insurers.
Brent Giese, executive director for fixed income at Daiwa Capital Markets, said the new margin requirements will put additional financial stress on mortgage lenders.