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.
BioMimetic Therapeutics Inc. (BMTI US) fell the most in the Russell 2000 Index, slumping 35 percent to $8.66. U.S. regulators said the company’s synthetic bone product Augment may not be as safe or effective as the real thing for grafts during foot and ankle surgeries.
Boston Scientific Corp. (BSX US) fell the most in the Standard & Poor’s 500 Index, dropping 9 percent to $7.02. The second-biggest maker of heart devices said Ray Elliott will retire as president and chief executive officer on Dec. 31.
Callon Petroleum Co. (CPE US) climbed 22 percent, the most since January 2010, to $7.56. The developer of oil properties reported first-quarter earnings of 12 cents a share, beating the 2-cents average estimate by analysts.
CKX Inc. (CKXE US) rallied 23 percent to $5.46 for the biggest gain in the Russell 2000 Index. Apollo Global Management LLC, the private-equity firm headed by Leon Black, agreed to pay $5.50 a share in cash, or about $509 million, for the owner of the “American Idol” television show.
DealerTrack Holdings Inc. (TRAK US) climbed 20 percent, the most since it went public in December 2005, to $25.49. The maker of software for car dealerships increased its full-year forecast, saying it now expects to earn at least 78 cents a share. Analysts, on average, estimated profit of 71 cents, according to a Bloomberg Survey.
Dean Foods Co. (DF US) jumped 11 percent to $12.24 for the biggest rally in the Standard & Poor’s 500 Index. The biggest U.S. dairy processor boosted its forecast for full-year profit excluding some items to at least 67 cents a share, more than the average analyst estimate of 57 cents a share, according to Bloomberg data.
Dice Holdings Inc. (DHX US) fell 5.5 percent to $16.22, the lowest price since April 14. The online provider of career services announced the sale of 8 million shares by stockholders including General Atlantic LLC and Quadrangle Group LLC.
EBay Inc. (EBAY US) rose 2.5 percent, the most since April 27, to $33.93. Microsoft Corp. (MSFT US) said it will buy Skype Technologies SA, the world’s most popular international calling service, for $8.5 billion in cash. The companies said the agreement has been approved by both boards of directors. EBay, owner of e-commerce sites and the PayPal online payment service, owns a part of Skype after selling most of its stake for $2 billion in 2009.
Microsoft slipped 0.6 percent to $25.67 for the biggest retreat in the Dow Jones Industrial Average.
Fossil Inc. (FOSL US) rose 13 percent to $105.97, the highest price since it went public in April 1993. The Texas-based maker of watches and jewelry forecast full-year earnings of at least $4.44 a share on an adjusted basis, more than the average analyst estimate of $4.37, Bloomberg data show.
InterMune Inc. (ITMN US) fell 8.7 percent, the most since Oct. 29, to $39.46. Warburg Pincus LLC, which owns a 16.1 percent stake in the maker of a drug for a rare lung disease, may start selling the shares as early as this quarter, according to a regulatory filing.
MannKind Corp. (MNKD US) plunged 12 percent, the most since Feb. 11, to $3.86. The Valencia, California-based biotechnology company founded by billionaire inventor Alfred Mann reported a first-quarter loss of 34 cents a share, 18 percent wider than the average loss estimate from analysts in a Bloomberg survey.
Medifast Inc. (MED US) climbed 18 percent, the most since May 2009, to $24.03. The provider of weight-loss programs posted first-quarter profit excluding some items of 44 cents a share, beating the average analyst estimate by 6.5 percent, Bloomberg data show.
Nanosphere Inc. (NSPH US) slid 24 percent to $2.22, the lowest price since it went public in November 2007. The developer of tests to diagnose diseases by using tiny gold particles said it’s offering 13.6 million shares at $2.20 a share and expects to raise $27.9 million from the sale.
North American Palladium Ltd. (PAL US) slumped 26 percent, the most since November 1999, to $4.18. The precious-metals producer with operations in Ontario reported a first-quarter loss of 6 Canadian cents a share, excluding certain items. Analysts, on average, forecast a profit of 1 Canadian cent a share, according to a Bloomberg survey.
SmartHeat Inc. (HEAT US) plunged 24 percent, the most since December 2008, $2.38. The U.S.-traded Chinese provider of clean technology products and services cut its full-year revenue forecast to no more than $93 million from at least $120 million.
ServiceSource International Inc. (SREV US) climbed 29 percent to $19.26, the highest price since it went public in March. The provider of Internet-based revenue management services said that, excluding some items, it expects to break even in the second quarter.
Tornier NV (TRNX US) advanced 16 percent, the most since it went public in February, to $25.70. The provider of orthopedic products forecast second-quarter sales of $65 million at least, exceeding the average analyst estimate of $63 million in a Bloomberg survey.
Triumph Group Inc. (TGI US) rose 11 percent to $98.25, the highest price since it went public in 1996. The maker of aircraft parts said that excluding some items, it expects to earn at least $8.35 a share in fiscal 2012. Analysts, on average, estimated $7.70, according to a Bloomberg survey.
Universal Display Corp. (PANL US) decreased 18 percent, the most since August 2009, to $46.32. The developer of technologies used in flat-panel displays posted a first-quarter loss of 9 cents a share, missing the average forecast for a loss of 3 cents among analysts surveyed by Bloomberg. The stock was downgraded to “hold” from “buy” at Canaccord Genuity Corp.
Usana Health Sciences Inc. (USNA US) tumbled 12 percent to $33.01 for its biggest decline since Feb. 9. The vitamin maker said Chief Financial Officer Jeffrey A. Yates, President Fred W. Cooper and Mark H. Wilson, executive vice president of sales, all left the company.