Several of the largest Ginnie Mae issuers showed modest declines in their Ginnie Mae servicing portfolios during the third quarter, possibly reflecting an increase in pool buyout activity. According to a new Inside Mortgage Finance analysis of Ginnie Mae data, Chase Manhattan Mortgage, Wells Fargo Home Mortgage, Countrywide and First Nationwide all showed declines in their Ginnie Mae servicing. In a heavily concentrated business, these four firms accounted for 24.0 percent of total Ginnie Mae