U.S. home loan bonds without government backing were little changed last week after a six-week rally, as buying by Wall Street traders helped keep prices from falling.

Though sales of nonagency mortgage bonds swelled to between $1 billion and $2 billion a day as investors who bought at lower prices sought to lock in gains, purchases by securities firms prevented "prices getting smoked," according to Jesse Litvak, a trader at Jefferies & Co. in New York.

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