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.
Amyris Inc. (AMRS US) dropped 21 percent to $1.99, the lowest price since its September 2010 initial public offering. The biotechnology company reported a bigger first-quarter loss than analysts estimated in a Bloomberg survey.
Arena Pharmaceuticals Inc. (ARNA US) increased 7 percent to $3.66, the highest price since September 2010. The biopharmaceutical company was raised to outperform from market perform at BMO Capital Markets. The rating means that Arena is forecast to beat the market.
Avon Products Inc. (AVP US) surged 9.3 percent, the most since April 2, to $21.60. JAB Holdings BV said it is selling 36 million shares of Reckitt Benckiser Group Plc to fund investments including its proposed acquisition of the door-to-door cosmetics seller.
Blue Nile Inc. (NILE US) gained 11 percent, the most since December 2010, to $30.20. The online retailer of diamonds and fine jewelry forecast 2012 revenue of $384 million to $417 million, compared with the average analyst estimate of $387.7 million.
Carrols Restaurant Group Inc. (TAST US) gained 14 percent to $5.08, the highest price since it went public in December 2006. The Burger King franchisee reported earnings that exceeded projections and said it estimates 2012 comparative sales to increase as much as 5 percent for Taco Cabana and as much as 7 percent for Pollo Tropical.
Chiquita Brands International Inc. (CQB US) fell the most in the Russell 2000 Index, slumping 29 percent to $5.70. The seller of bananas and other produce reported first-quarter earnings excluding some items of 4 cents a share, missing the average analyst estimate of 32 cents in a Bloomberg survey.
Cost Plus Inc. (CPWM US) rallied 22 percent to $21.93, the highest price since August 2005. The seller of international-themed food and casual furnishings agreed to be bought by Bed Bath & Beyond Inc. (BBBY US) for about $495 million, or $22 a share.
Dean Foods Co. (DF US) rose 11 percent, the second-most in the Standard & Poor’s 500 Index, to $14.15. The biggest U.S. dairy processor boosted its full-year forecast, saying it now expects to earn at least $1.10 a share. Analysts, on average, estimated 95 cents, according to a Bloomberg survey.
Demand Media Inc. (DMD US) climbed 8.1 percent, the most since April 30, to $8.57. The operator of eHow.com and domain-name business eNom.com forecast earnings in the second quarter of at least 7 cents a share, beating the average analyst estimate by 1 cent. The company also increased its annual earnings forecast to no more than 35 cents a share. The average analyst estimate is 28 cents.
Dynavax Technologies Corp. (DVAX US) plunged 23 percent to $3.94 for its biggest retreat since December 2008. The biopharmaceutical company priced an offer of 17.5 million shares at $4.25 a share.
Hilltop Holdings Inc. (HTH US) rallied 22 percent, the most since its February 2004 IPO, to $9.75. The Dallas-based fire and homeowners insurance company said it agreed to buy PlainsCapital Corp. (PCB US) for $15.18 a share, or $318 million total.
Interval Leisure Group Inc. (IILG US) rallied 2.5 percent to $17.97, the highest price since at least 2008. The provider of membership services to the vacation ownership industry reported first-quarter sales of $126.7 million, topping the average analyst estimate of $122.5 million.
Kronos Worldwide Inc. (KRO US) fell 12 percent, the most since Aug. 8, to $20.16. The maker of titanium dioxide pigments had quarterly sales that fell short of the average analyst estimate, according to data compiled by Bloomberg.
Macy’s Inc. (M US) sank 3.7 percent to $38.05, the lowest price since March 6. The second-biggest U.S. department-store chain repeated its 2012 earnings forecast of no more than $3.30 a share. The average analyst estimate is $3.39.
MetroPCS Communications Inc. (PCS US) gained 14 percent to $7.50 for the biggest gain in the S&P 500. Deutsche Telekom AG is discussing a merger of its T-Mobile USA unit with MetroPCS as it reviews options for the customer-losing business, according to people familiar with the matter.
MercadoLibre Inc. (MELI US) sank 12 percent, the most since Aug. 4, to $77.08. The Latin American online-auction site posted first-quarter earnings excluding some items of 45 cents a share, falling short of the average analyst estimate by 1 cent.
Pluristem Therapeutics Inc. (PSTI US) jumped 13 percent, the most since Oct. 19, to $2.65. The Haifa, Israel-based company said that its PLX cells saved the life of a 7-year-old girl with a bone marrow condition.
Quest Software Inc. (QSFT US) climbed 10 percent to $25.17, the highest price since May 2011. The provider of business software, which agreed in March to be bought by private-equity firm Insight Venture Partners for about $2 billion, said it received “multiple written proposals for potential alternative transactions” during a 60-day so-called “go-shop” period.
SodaStream International Ltd. (SODA US) surged 26 percent, the most since its November 2010 IPO, to $36.90. The producer of soda makers reported first-quarter earnings excluding some items of 55 cents per share, exceeding the average analyst estimate of 34 cents.
Walt Disney Co. (DIS US) advanced 1.6 percent to $45.02 for the biggest gain in the Dow Jones Industrial Average. The world’s largest entertainment company said second-quarter earnings rose 21 percent, beating analysts’ estimates on rising theme-park and cable-television profits.
W&T Offshore Inc. (WTI US) fell 9.4 percent, the most since Sept. 22, to $17.34. The oil and gas company with operations in the Gulf of Mexico reported first-quarter profit excluding some items of 40 cents a share, trailing the average analyst estimate of 50 cents in a Bloomberg survey.
XL Group Plc (XL US) gained 4.3 percent to $22.25, the highest price since Oct. 28. The insurer and reinsurer reported first-quarter operating earnings of 52 cents a share, exceeding the average analyst estimate of 40 cents.