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.
Advanced Micro Devices Inc. (AMD US) surged 19 percent to $7.75 for the biggest gain in the Standard & Poor’s 500 Index. The second-largest maker of processors for personal computers forecast third-quarter sales that exceeded analysts’ estimates, citing orders for new chips. The company also had its stock rating raised by analysts at Wells Fargo & Co. and Canaccord Adams Inc.
Micron Technology Inc. (MU US), another chipmaker, advanced 5.8 percent to $8.09.
Air Transport Services Group Inc. (ATSG US) dropped 8.5 percent to $5.39, the lowest price since Sept. 16. The aircraft leasing and cargo transportation provider said its second-largest customer, DB Schenker, plans to adopt a new operating model that phases out the dedicated air-cargo network supported by ATSG’s airline subsidiaries.
Amcol International Corp. (ACO US) declined 13 percent, the most since June 2009, to $31.09. The producer of clays reported second-quarter earnings before interest, taxes, depreciation and amortization that trailed the average analyst estimate in a Bloomberg survey.
Athenahealth Inc. (ATHN US) jumped 18 percent to $57.09, the highest price since it went public in September 2007. The provider of Internet-based services for physician practices said it earned 22 cents a share excluding some items in the second quarter, beating the average analyst estimate by 20 percent.
Avid Technology Inc. (AVID US) dropped the most in the Russell 2000 Index, slumping 25 percent to $13.74. The maker of software for digital audio and video production reported a loss excluding some items of 10 cents a share in the second quarter. Analysts had expected a profit of 9 cents, according to Bloomberg survey. JPMorgan Chase & Co. cut the stock’s rating to “neutral” from “overweight.”
Caterpillar Inc. (CAT US) slipped 5.8 percent, the most in the Dow Jones Industrial Average, to $105.15. The world’s largest maker of construction and mining equipment posted second-quarter earnings that missed the average analyst estimate after the Japanese earthquake and tsunami reduced sales and demand slowed in China.
Cepheid Inc. (CPHD US) climbed 29 percent to $40.77, the highest intraday price since it went public in June 2000. The maker of a rapid test for drug-resistant staph infections increased its earnings-per-share forecast for the fiscal year to as much as 11 cents a share, beating the average estimate of 5 cents a share by analysts.
Coinstar Inc. (CSTR US) fell 7.5 percent, the most since Feb. 4, to $54.23. The operator of the Redbox film-rental kiosks said preliminary second-quarter revenue rose to $434 million to $436 million, falling short of analysts’ projections of $445.6 million. Mitch Lowe resigned as head of the Redbox unit, from which Coinstar gets 85 percent of its sales.
Compuware Corp. (CPWR US) rose 7.1 percent, the most since Oct. 22, to $10.06. The business software maker reported first-quarter sales of $230 million, beating the average analyst estimate of $224.2 million in a Bloomberg survey.
C.R. Bard Inc. (BCR US) had the biggest loss in the S&P 500, sinking 12 percent to $99.58. The maker of medical devices such as catheters and drains reported a loss in the second quarter due to a legal settlement.
Flextronics International Ltd. (FLEX US) rose 9.4 percent, the most since Oct. 28, to $7.01. The supplier of cameras and battery chargers for Apple Inc. (AAPL US) said it may buy back up to $200 million of its outstanding shares.
McDonald’s Corp. (MCD US) gained 2.3 percent to $88.56, the highest price since at least 1980. The world’s largest restaurant chain said second-quarter earnings per share were $1.35 a share, beating the average analyst estimate of $1.28, as more consumers dined out and the McCafe line of beverages boosted sales.
Reynolds American Inc. (RAI US) fell 5.8 percent, the most since April 2009, to $36.26. The tobacco company posted second-quarter excluding some items of 67 cents a share, missing the average analyst estimate of 71 cents in a Bloomberg survey.
Ruby Tuesday Inc. (RT US) dropped 14 percent to $9.50, the lowest price since August. The casual-dining chain forecast first quarter earnings of 6 cents a share at the most, less than the average analyst estimate of 20 cents. It was cut to underperform at
SanDisk Corp. (SNDK US) climbed 9.6 percent, the most since May 2010, to $45.57. The maker of flash-memory cards reported second-quarter profit excluding some items of $1.14 a share, beating the average analyst estimate by 16 percent, Bloomberg data show.
Skyworks Solutions Inc. (SWKS US) rallied 19 percent to $26.98 for the second-biggest increase in the Russell 1000 Index. The wireless semiconductor company forecast fourth-quarter revenue of $400 million, beating the average analyst estimate of $371.3 million.
StanCorp Financial Group Inc. (SFG US) plunged 14 percent, the most since November 2008, to $35.50. The Portland, Oregon-based disability insurer fell said second-quarter earnings excluding some items were 61 cents a share missing the average estimate of $1.03.
Supervalu Inc. (SVU US) fell 7 percent, the most since Jan. 11, to $8.77. The supermarket chain may report “weak operating results” for the first quarter of 2012, Bob Summers, an analyst at Susquehanna Financial Group, said in a report. Supervalu is scheduled to post results on July 26.
Verizon Communications Inc. (VZ US) dropped 2.2 percent, the most since April 21, to $36.74. Verizon Wireless, the wireless carrier that’s co-owned by Verizon and Vodafone Group Plc, said today that it activated 2.3 million of Apple Inc.’s (AAPL US) iPhone devices in the second quarter, while AT&T Inc. (T US) said yesterday it switched on 3.6 million devices in the period.