The Russell 2000 Index rose for the first time this week, adding 0.6 percent to 743.71. The Standard & Poor's 500 Index (SPX), whose companies have a median market value 22 times larger than the Russell 2000's, fell less than 0.1 percent. The stock indexes have dropped 2.9 percent and 6.2 percent, respectively, this year.
Ambac Financial Group Inc. (ABKFQ:US) tumbled 17 percent to $2.49, a record low. Moody's Investors Service said it may cut its Aaa credit ratings on Ambac, the second-biggest bond insurer, and MBIA Inc. (MBI:US) , the largest, because of their diminished new business prospects and reduced financial flexibility.
MBIA dropped 16 percent to $5.63, the lowest in almost 20 years.
Bob Evans Farms Inc. (BOBE US) had the biggest gain in at least 20 years, surging 17 percent to $34.09. The restaurant owner and sausage maker reported fourth-quarter profit of 52 cents a share, more than the 44-cent average estimate of analysts surveyed by Bloomberg.
Datascope Corp. (DSCP US) rose the most since March 11, climbing 11 percent to $46.60. The maker of medical devices said it has received ``a number'' of inquiries from possible acquirers.
Hovnanian Enterprises Inc. (HOV:US) fell 10 percent to $7.50, the lowest since Jan. 25. New Jersey's biggest homebuilder reported its seventh consecutive quarterly loss as the value of its land continued to decline.
Indevus Pharmaceuticals Inc. (IDEV US) plunged 69 percent, the most since June 2002, to $1.26. U.S. regulators requested new safety tests for the drugmaker's low testosterone treatment, called Nebido, after a person in a clinical trial had an adverse reaction that included coughing and shortness of breath.
Koppers Holdings Inc. (KOP:US) rose the most in two years, adding 12 percent to $48.12. The maker of wood treatments and railroad ties was raised to ``buy'' from ``neutral'' at UBS AG.
Tibco Software Inc. (TIBX:US) had the biggest drop since March 2005, losing 7.8 percent to $7.12. The maker of business software for ABN Amro Holding NV and Delta Air Lines Inc. reported preliminary second-quarter profit yesterday below the average analyst estimate.
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