The top 30 mortgage lenders in the U.S. produced a staggering $914.1 billion of new mortgages during the third quarter of 2003, but reaped relatively little growth in their servicing businesses. As a group, the top 30 firms managed to increase their combined servicing portfolio by just $173.9 billion during the quarter, meaning that 81 percent of new production went to simply filling the gap left by runoff from refinancing and housing turnover.