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.
A123 Systems Inc. (AONE US) decreased 18 percent to $8.53, the most since it went public in September. The maker of lithium batteries for plug-in cars reported a second-quarter loss of 33 cents a share, wider than the 27-cent loss estimated by analysts in a Bloomberg survey.
Alpha & Omega Semiconductor Ltd. (AOSL US) slumped 24 percent, the most since it went public in April, to $9.94. The maker of chips that extend the battery life of laptops was cut to “hold” from “buy” at Deutsche Bank AG.
Ameristar Casinos Inc. (ASCA US) jumped 12 percent, the most since April 2009, to $16.27. The operator of casinos in the Midwest and Southwest hired Lazard to explore a possible sale, the New York Post reported, citing unidentified persons.
Broadcom Corp. (BRCM US) dropped 6.1 percent, the most since Oct. 23, to $33.79. The largest maker of chips for television set-top boxes may see a deceleration in orders in September, Robert W Baird & Co. analyst Tristan Gerra wrote in a note today. He also said Broadcom is unlikely to exceed its revenue forecast this quarter.
SanDisk Corp. (SNDK US), the biggest maker of flash-memory cards, fell 6.1 percent to $42.83.
CareFusion Corp. (CFN US) had the biggest gain in the S&P 500, rising 8.7 percent to $23.26. The maker of products to reduce hospital infections and monitor medical safety will cut about 700 jobs as part of a restructuring to eliminate layers of management and lower costs.
Cree Inc. (CREE US) slipped 13 percent, the biggest drop since September 2008, to $59.81. The maker of energy-efficient lighting products forecast first-quarter sales of $280 million at most. That missed the average estimate of $284.3 million from analysts in a Bloomberg survey.
Macy’s Inc. (M US) had the second-biggest gain in the S&P 500, jumping 5.9 percent to $20.52. The second-biggest U.S. department-store chain posted second-quarter profit of 35 cents a share. Analysts surveyed by Bloomberg had estimated 29 cents on average. The retailer also boosted its 2010 forecast.
Massey Energy Co. (MEE US) fell 6.4 percent, its biggest drop since July 27, to $30.99. Executives will be subpoenaed in the U.S. investigation of a deadly West Virginia coal mine explosion that a safety regulator today called “a preventable occurrence.” The April 5 blast at the Upper Big Branch Mine killed 29 people.