Wells Fargo Home Mortgage was the top servicer of mortgages pooled in Ginnie Mae securities as of the first quarter of 2005, with $89.73 billion in volume. That gave Wells a hefty 20.2 percent share of the declining Ginnie Mae servicing business (see next page). Although the company has increased its Ginnie servicing volume by 4.6 percent since the first quarter of 2004, its portfolio shrank slightly during the first three months of 2005. …