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.
51job Inc. (JOBS US) climbed 12 percent, the most since May 6, to $50.64. The provider of human resource services in China reported fourth-quarter profit that exceeded analysts’ forecast.
Celldex Therapeutics Inc. (CLDX US) fell 12 percent, the most since Aug. 8, to $3.85. The biopharmaceutical company offered 10.5 million shares of common stock at $3.85 each.
Chelsea Therapeutics International Ltd. (CHTP US) surged 61 percent, the most in the Russell 2000 Index, to $3.88. The company’s drug to treat a condition that can cause dizziness in people with central nervous system disorders won the backing of a U.S. advisory panel.
Clearwire Corp. (CLWR US) dropped 6.8 percent to $2.11 for the third-biggest loss in the Russell 1000 Index. The wireless broadband provider’s third-largest investor, Google Inc. (GOOG US), said it plans to sell its stake. Google held 29.4 million shares as of Dec. 16.
Crocs Inc. (CROX US) fell 5 percent, the most since Dec. 28, to $19.41. The plastic-clogs maker forecast first-quarter earnings of no more than 26 cents a share, below the 30-cent profit estimated by analysts on average.
Deckers Outdoor Corp. (DECK US) slid 14 percent to $77.72 for the biggest decline in the Russell 1000 Index. The maker of Ugg boots and Teva sandals said earnings in 2012 will be unchanged from last year at $5.07 a share, missing the average analyst estimate of $5.80.
Gap Inc. (GPS US) lost 4 percent, the most since Aug. 18, to $22.57. The largest U.S. apparel chain forecast profit this year that was less than some analysts estimated as sales declined at its Old Navy stores.
Harsco Corp. (HSC US) slid 2.6 percent, the most since Jan. 4, to $22.57. The company, which provides gas control and scaffolding services, said Chairman and Chief Executive Officer Salvatore Fazzolari resigned.
Interpublic Group of Cos. (IPG US) rose 6.5 percent to $11.62, the highest price since July 27. The New York-based advertising company announced a $300 million share buyback program.
Jazz Pharmaceuticals Inc. (JAZZ US) gained 4.6 percent to $50.81, the highest price since its initial public offering in May 2007. The drugmaker had its price estimate raised to $61 from $52 at Piper Jaffray Cos., which cited greater confidence that its drug Prialt will gain “significant traction.”
Kenneth Cole Productions Inc. (KCP US) rose 19 percent to $15.49, the highest price since October 2010. Kenneth Cole is taking private the fashion company he created 30 years ago, offering to buy the shares he doesn’t own for $15 each.
Kindred Healthcare Inc. (KND US) fell 14 percent, the most since Aug. 1, to $10.69. The operator of nursing homes forecast 2012 earnings of no more than $1.55 a share, missing the average analyst estimate of $1.68 a share.
Merit Medical Systems Inc. (MMSI US) dropped 6.7 percent, the most since Aug. 10, to $12.46. The maker of medical devices reported fourth-quarter earnings that missed analysts’ estimates for the first time since 2010, according to data compiled by Bloomberg.
Molycorp Inc. (MCP US) fell 7.8 percent, the most since Dec. 28, to $26.81. The owner of the largest rare-earth deposit outside China had its share-price estimate cut to $27 from $39 by JPMorgan Chase & Co., which said rising supply will push rare-earth prices lower.
Nordson Corp. (NDSN US) rose 7.2 percent, the most since Oct. 4, to $54.46. The maker of adhesive equipment forecast second-quarter earnings of 83 cents a share at least, topping the average analyst estimate of 77 cents in a Bloomberg survey.
OmniVision Technologies Inc. (OVTI US) rose 6.5 percent to $17.13 for the biggest gain since Feb. 16. The primary supplier of camera sensors for Apple Inc.’s (AAPL US) iPhone 4S projected fourth-quarter earnings of at least 15 cents a share, exceeding the 12-cent profit predicted by analysts on average.
Orient-Express Hotels Ltd. (OEH US) gained 13 percent, the most since August 2010, to $10.05. The manager of luxury hotels, restaurants, tourist trains and river cruise properties reported a fourth-quarter loss that was smaller than analysts estimated.
Proto Labs Inc. (PRLB US) soared 81 percent to $29 on the first day of trading. The manufacturer of plastics products sold 4.3 million shares at $16 each in an initial public offering.
Rubicon Technology Inc. (RBCN US) fell 19 percent, the most since November 2008, to $9.84. The maker of crystalline products forecast a loss of 10 cents a share at least in the first quarter. That’s wider than the average 9-cent loss estimated by analysts in a Bloomberg survey.
Salesforce.com Inc. (CRM US) rallied 9 percent, the second-biggest gain in the S&P 500, to $143.64. The largest seller of online customer-management software reported profit and sales that topped analysts’ estimates after the company added features and pushed into social media.