Fannie Mae's business declined 15% in November.
The secondary lender reported business volume of $52.7 billion was about $9 billion lower than October. A year ago, the figure was reported at $75.2 billion.
November's business volume was comprised of about $33.5 billion in mortgage-backed securities acquired by others and $19.1 billion in portfolio purchases, according to the company's latest monthly summary report.
Fannie's $2.3 trillion book of business at the end of the month reportedly consisted of $1.4 trillion in outstanding MBS and a $0.9 trillion gross mortgage portfolio.
Single-family delinquency, which is reported on a one-month lag, edged up three basis points from the previous month to 0.62% in October, the Washington, D.C.-based secondary lender said.
The government sponsored enterprise reported its duration gap went from zero to negative 1.