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The 10-year Treasury yield, a standard benchmark for mortgages and other loans, started October at 1.63 percent.

Among other companies making big moves Wednesday:

• Dean Foods led all stocks in the S&P 500 with a 13 percent jump. The dairy company offered more details about its planned spin-off of a subsidiary, WhiteWave, the producer of Silk Soymilk. Dean Foods said it will keep at least 80 percent of WhiteWave after the company’s initial public offering. The company’s stock rose $1.92 to $16.96.

• The University of Phoenix’s parent company, the Apollo Group, plunged 22 percent, the biggest drop in the S&P 500. A sharp drop in student enrollment has cut into profits, Apollo reported late Tuesday. To cope with shrinking enrollment, Apollo plans to close 115 of the university’s mostly smaller locations. Its stock lost $6.09 to $21.40.

• Bank of New York Mellon surged $1.30 to $24.86 after reporting net income and revenue that topped analysts’ estimates. The bank slashed expenses and collected more fees for managing investments. Investment income more than doubled from the year before.