U.S. home loan bonds without government backing slumped for a second week as investors and brokers pulled back from several types of securitized debt after what was characterized as an intense rally.

The most-senior so-called nonagency securities backed by option adjustable-rate mortgages tumbled 4 cents on the dollar last week, to 47 cents, after falling 2 cents the previous week, according to data from Barclays Capital Inc. The debt had jumped from 33 cents on the dollar in March.

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