Bloomberg News WASHINGTON - Fannie Mae said it committed to buy $16.6 billion of home loans last month.

That was 40.1% more than the commitment it made in June.

Mortgage purchases increased 17.9%, to $15.1 billion.

The net mortgage portfolio grew to $558 billion, at an annual growth rate of 18.6%, up from 13.6% in June.

Fannie's issuance of mortgage-backed securities fell 12.4% from April, to $16.9 billion. Mortgage securities outstanding rose to $1 trillion last month, a 7.3% annualized growth rate.

The government-sponsored enterprise said its net interest margin was 102 basis points in July, level with June's. Liquidations from the portfolio grew 6.1%, to $5.2 billion.

The delinquency rate on Fannie single-family mortgages was 0.41% in June, down 1 basis point from May. The delinquency rate on multifamily mortgages fell 8 basis points, to 0.05% in May.

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