WASHINGTON - Fannie Mae said its mortgage portfolio grew 15.1% from August to September, to $571 billion.

Adjustable-rate mortgage commitments grew 3.02%, to $1.66 billion. Single-family commitments grew 15.24%, to $15.94 billion, and multifamily ones fell 0.52%, to $196 million. Purchases grew 2.2%, to $9.89 billion.

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