Freddie Mac's portfolio of mortgage assets grew at an annual rate of 66% last month, its fastest pace ever, as regulators pushed the government-sponsored enterprise to ease constraints on the U.S. housing market.

The portfolio rose by $41.7 billion in November, to an all-time high of $805.4 billion, Freddie said last week in its monthly volume summary. The percentage increase was the largest on record, according to Kathryn Courbe, a spokeswoman for the McLean, Va., company.

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