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.
Fertilizer stocks slid as the price of wheat declined for a third time in four days on speculation that China’s demand for grain and oilseed will ease after the country took steps to curb inflation. CF Industries Holdings Inc. (CF US), the world’s second-largest maker of nitrogen fertilizer, lost 6.7 percent to $137.87. Mosaic Co. (MOS US) fell 4.3 percent to $83.02. Intrepid Potash Inc. (IPI US) declined 5 percent to $37.39.
Monsanto Co. (MON US), the world’s largest seed company, lost 2.4 percent to $72.39.
Acorda Therapeutics Inc. (ACOR US) declined 3.3 percent to $21.27 for the biggest drop since October 2009. The biotechnology company was cut was cut to “underweight” from “neutral” at Piper Jaffray Cos.
Alnylam Pharmaceuticals Inc. (ALNY US) surged 15 percent, the most since July 2007, to $11.37. The developer of drugs using a technology that inactivates genes was raised to “buy” from “neutral” at Roth Capital Partners LLC.
American Public Education Inc. (APEI US) gained 24 percent, the most since November 2007, to $43.49. The operator of the American Military University reported fourth-quarter profit of 52 cents a share, beating the average of analyst estimates in a Bloomberg by 11 percent.
Other education companies rallied. Career Education Corp. (CECO US) climbed 4.5 percent to $24.37. ITT Educational Services Inc. (ESI US) rallied 4.2 percent to $72.67. Strayer Education Inc. (STRA US) advanced 2.9 percent to $136.62.
Aruba Networks Inc. (ARUN US) rose 17 percent to $31.22, the highest price ever. The builder of wireless networks reported second-quarter profit excluding some items of 14 cents a share, topping the 13-cent average estimate of analysts in a Bloomberg survey.
Barnes Group Inc. (B US) fell 4.7 percent, the most since July 16, to $20.71. The auto-parts producer forecast 2011 earnings that would fall short of the average analyst estimate, according to data compiled by Bloomberg.
BioMarin Pharmaceutical Inc. (BMRN US) declined 3.8 percent, the most since June 29, to $27.23. The maker of treatments for rare genetic disorders was cut to “hold” from “buy” at Deutsche Bank AG.
Blue Coat Systems Inc. (BCSI US) fell 7.5 percent, the most since Aug. 20 to $28.24. The provider of Internet security for corporations forecast fourth-quarter sales of $128 million at most, trailing the average analyst estimate of $129.7 million in a Bloomberg survey.
Brocade Communications Systems Inc. (BRCD US) gained 6 percent, the most since Sept. 22, to $6.38. The biggest maker of switches for data-storage networks forecast fiscal second-quarter earnings of 10 cents a share excluding some items, beating the 9-cent average analyst estimate in a Bloomberg survey.
Campbell Soup Co. (CPB US) slipped 3.9 percent, the most since February 2009, to $33.58. The world’s largest soup maker forecast 2011 earnings will be no more than $2.45 a share, below the $2.51 projected by analysts on average.
Caterpillar Inc. (CAT US) climbed 2.4 percent, the most in the Dow Jones Industrial Average, to $105.86. The world’s largest maker of construction equipment said retail sales of machinery rose 49 percent worldwide in the three months ended in January.
Clearwire Corp. (CLWR US) climbed 8.3 percent to $5.64 for the biggest gain since Feb. 4. The fourth-generation wireless service provider predicted improving earnings that could eliminate the need for additional funding.
Compass Diversified Holdings (CODI US) declined 7.2 percent, the most since April 13, to $16.72. Chief Executive Officer Joe Massoud will take a leave of absence to focus on an informal regulatory inquiry on matters unrelated to the company. The Westport, Connecticut-based company was cut to “hold” from “buy” at BB&T Capital Markets.
EOG Resources Inc. (EOG US) climbed 4.5 percent, the most since Aug. 2, to $108.89. The natural gas and crude oil company reported fourth-quarter adjusted profit was 36 cents a share, beating the average analyst estimate of 26 cents.
Exelixis Inc. (EXEL US) rose 8.8 percent, the most since Jan. 26, to $10.76. The biotechnology company with no approved products said its lead drug, XL184, reduced bone tumors in prostate cancer patients and eased their pain.
Healthspring Inc. (HS US) advanced 8.6 percent to $37.06, the highest price ever. The health-care coverage provider forecast earnings in 2011 will be as much as $3.90 a share, topping the $3.67 average estimate of analysts.
Intuit Inc. (INTU US) gained 7.3 percent to $54.11, the biggest gain in the Standard & Poor’s 500 Index. The provider of tax and personal-finance software boosted its forecast for full-year profit excluding some items to as much as $2.48 a share from earlier outlook of $2.43 a share at most. The average analyst prediction in a Bloomberg survey is for earnings of $2.41 cents a share.
JDS Uniphase Corp. (JDSU US) fell 5.3 percent to $25.20, the third-biggest decline in the S&P 500. The biggest network-analysis company was cut to a “hold” from “buy” by Citigroup Inc. analyst Kevin Dennean.
Newpark Resources Inc. (NR US) advanced 4.8 percent to $6.81, the highest price since Oct. 28. The drilling-services company posted fourth-quarter earnings excluding some items of 15 cents a share, beating the average analyst estimate by 53 percent.
Patterson Cos Inc. (PDCO US) slumped 1.5 percent, the most since Dec. 6, to $33.85. The maker of medical devices for dental and veterinary clinics forecast third-quarter adjusted earnings will be no more than 47 cents a share, missing the 51-cent average estimate projected by analysts.
Red Robin Gourmet Burgers Inc. (RRGB US) rose 13 percent, the most since March 2009, to $23.76. The restaurant operator reported fourth-quarter profit excluding some items of 12 cents a share, almost three times the average analyst estimate, Bloomberg data showed.
Rogers Corp. (ROG US) gained 8.9 percent, the most since November 2009, to $46.90. The maker of components used by telephone, technology and defense companies forecast first-quarter sales and earnings that exceed the average analyst estimate, according to data compiled by Bloomberg.
Rosetta Stone Inc. (RST US) slid 17 percent, the most since August 2009, to $16.76. The language-software maker lowered its fourth-quarter adjusted earnings forecast to 27 cents, below the 36-cent average estimate by analysts.
Stryker Corp. (SYK US) rose 3.7 percent to $63, the highest price since September 2008. Zimmer Holdings Inc. (ZMH US) climbed 2.3 percent to $63.69, after earlier increasing to $65.22, the highest since October 2008. The medical device makers rallied after Robert W Baird & Co. said they may pick up market share this year.
SunPower Corp. (SPWRA US) advanced 3.5 percent to $18.04, the highest price since April 26. The second-largest U.S. solar module manufacturer forecast full-year 2011 earnings excluding some costs of as much as $2.20. The average analyst prediction in a Bloomberg survey is for earnings of $1.74 cents a share.
TechTarget Inc. (TTGT US) surged 19 percent, the most since May 2009, to $8.67. The operator of websites for technology professionals forecast first-quarter sales of as much as $23.5 million, beating the $23.2 million average estimate of two analysts surveyed by Bloomberg. The New Town, Massachusetts-based company was raised to a “buy” by Needham & Co. and Caris & Company.
Valmont Industries Inc. (VMI US) rallied 13 percent to $110.26, the largest advance in the Russell 1000 Index. The maker of light poles and irrigation equipment reported fourth-quarter adjusted earnings of $1.32 a share, beating the $1.13 average estimate of analysts.