Shares of the following companies had unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 4 p.m. in New York.
For-profit colleges fell before a report from the U.S. Department of Education that will show how its proposed requirements for student-loan eligibility would affect the industry.
DeVry Inc. (DV US) slid 5.7 percent to $42.71. Career Education Corp. (CECO US) declined 4.1 percent to $18.79. ITT Educational Services Inc. (ESI US) fell 7.2 percent to $64.33. Strayer Education Inc. (STRA US) dropped 4.7 percent to $200.01.
Allis-Chalmers Energy Inc. (ALY US) surged 61 percent, the most since June 2004, to $3.70. Seawell Ltd., the Bermuda-based oil services provider, agreed to buy Allis-Chalmers for $307.8 million to expand its drilling and well operations.
Comverse Technology Inc. (CMVT US) slumped 25 percent, the most since July 2001, to $4.90. The world’s largest maker of voice-mail software was cut to “hold” from “buy” at Stifel Nicolaus, which cited a “degradation of the core business and deterioration of accessible cash.”
Dynegy Inc. (DYN US) surged 63 percent, the most since November 2002, to $4.53. Blackstone Group LP agreed to buy the Texas power producer that lost 94 percent of its market value in the past three years for more than $540 million.
Other power companies advanced. RRI Energy Inc. (RRI US) climbed 6.5 percent to $3.59. Mirant Corp. (MIR US) rose 4.6 percent to $9.97. Calpine Corp. (CPN US) added 4.6 percent to $13.09.
Nordstrom Inc. (JWN US) declined 7.2 percent, the most since May 2009, to $31.05. The owner of more than 100 namesake department stores said expenses rose in the second quarter.
Nvidia Corp. (NVDA US) climbed 4.8 percent, the most since July 7, to $9.39. The maker of chips for computer graphics cards is working on a microprocessor for tablet devices that would directly compete with Intel Corp. (INTC US) products, two people familiar with the matter said. Intel lost 1.5 percent, the most in the Dow Jones Industrial Average, to $19.15.
Premier Exhibitions Inc. (PRXI US) rallied 34 percent, the most since Sept. 21, to $1.55. The maker of museum displays that include exhibits of dissected human bodies said a court granted a salvage award worth about $110 million to the company for its work in recovering artifacts from the wreck of the Titanic.
Trubion Pharmaceuticals Inc. (TRBN US) rallied 50 percent, the most since it started trading in 2006, to $4.50. The drugmaker agreed to be bought by Emergent BioSolutions Inc. (EBS US) for as much as $135.5 million. Emergent slipped 5.8 percent to $17.43.
Telestone Technologies Corp. (TSTC US) dropped 24 percent, the most since February 2009, to $10.34. The Chinese maker of wireless gear said second-quarter profit declined to 16 cents a share from 19 cent a year earlier.
Unica Corp. (UNCA US) soared 118 percent, the most since it went public in August 2005, to $20.84. International Business Machines Corp. (IBM US), the world’s largest computer-services provider, agreed to buy Unica for about $480 million to gain technology that lets customers build more targeted marketing campaigns.