Shares of the following companies are having unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 11 a.m. in New York.

Alcoa Inc. (AA) rose the most in the Dow Jones Industrial Average, climbing 6.5 percent to $14.38. The largest U.S. aluminum producer had its stock-price estimate raised to $25 from $22 by JPMorgan Chase & Co., which said the company's earnings will increase more than previously projected next year as metal prices gain.

Century Aluminum Co. (CENX), whose price estimate was lifted to $13 from $9, gained 8.8 percent to $12.49.

Autoliv Inc. (ALV) jumped 4.7 percent to $42.37 after advancing earlier to $43.21, the highest intraday price since July 2008. The world's largest maker of automotive air bags increased its fourth-quarter sales forecast, saying revenue will increase 20 percent as developing car markets such as China's expand. The company had predicted sales growth of 10 percent.

Christopher & Banks Corp. (CBK) surged 28 percent to $7.71 for the biggest rally in Russell 2000 Index. The Minnesota-based women's clothing retailer said it probably earned at least 19 cents a share in the third quarter. Analysts, on average, estimated a loss of 5 cents, according to a Bloomberg survey.

Clearwire Corp. (CLWR) rose 4.1 percent to $6.08 and advanced earlier to $6.27, the highest intraday price since Nov. 17. The U.S. wireless carrier building a high-speed Internet network was upgraded to "buy" from "sell" by Soleil Securities, which cited potential for customer growth.

CVS Caremark Corp. (CVS) added 2.5 percent to $32.30 after climbing 3 percent earlier, the most intraday since Nov. 9. The pharmacy-benefits manager was selected over other bidders for a contract valued at almost $1 billion to provide pharmacy- benefits services to retired Texas teachers.

Deer Consumer Products Inc. (DEER) dropped 23 percent to $12.25 and erased as much as 25 percent, the most intraday since March 16. The maker of motor-driven kitchen appliances said it priced 6 million shares at $11 each and plans to expand in China. The creation of additional stock tends to dilute future earnings for existing shareholders.

Empresa Brasileira de Aeronautica SA (ERJ) rose 9.7 percent to $22.32 and jumped 10 percent earlier, the most intraday since Aug. 3. The world's fourth-largest aircraft maker, also known as Embraer, said it signed a memorandum of understanding for as much as $2.2 billion in aircraft financing and leasing from CDB Leasing Co., the lessor backed by China Development Bank Corp.

Esterline Technologies Corp. (ESL) rose 3.6 percent to $42.46. The manufacturer of jet-engine parts posted fourth- quarter profit excluding some items of $1.18 a share, topping the average analyst estimate by 23 percent.

Gamestop Corp. (GME) added 2.9 percent to $21.80 after climbing 6.2 percent earlier, the most intraday since Aug. 4. The world's largest video-game retailer said its new software sales increased 15 percent in U.S. last month. Herley Industries Inc. (HRLY) rose 6.3 percent to $12.94 and climbed 13 percent earlier, the most intraday since July 23. The maker of military communications equipment posted first- quartet profit excluding some items of 29 cents a share, exceeding both analysts' estimates in a Bloomberg survey.

IMS Health Inc. (RX) had the steepest decline in the S&P 500, tumbling 10 percent to $19.22. The provider of prescription data to drugmakers and analysts fell after the Associated Press reported that Democrats Herb Kohl of Wisconsin and Dick Durbin of Illinois proposed to ban the sale of prescribing records for marketing purposes under an amendment to the Senate health care bill.

Lockheed Martin Corp. (LMT) rose 1.8 percent to $77.33. The world's largest defense company won a contract valued at as much as $318 million to provide support services in Iraq and Afghanistan to the Joint Improvised Explosive Device Defeat Organization, the Pentagon said.

NCR Corp. (NCR) jumped 9 percent to $10.67 for the biggest advance in the Russell 1000 Index. The world's largest maker of automated-teller machines was raised to "overweight" from "neutral" at JPMorgan by equity analyst Paul Coster.

Sirona Dental Systems Inc. (SIRO) dropped 7.1 percent $32.44 and sank as much as 8.9 percent, the most intraday since Aug. 6. The maker of dental-imaging equipment said on its Web site it filed a prospectus supplement to its existing shelf registration as part of a sale of 7.4 million shares for holders. The New York-based company said it won't receive any proceeds from this sale.

Superior Energy Services Inc. (SPN) rose 9 percent to $22.13 and advanced 13 percent earlier, the most intraday since November 2008. The U.S. oil-services provider offered to buy Hallin Marine Subsea International Plc, a U.K. provider of underwater vehicles and technology, for 233 pence a share in cash. Capital One Southcoast Inc. boosted the stock's rating to "add" from "neutral," citing the acquisition.

Before it's here, it's on the Bloomberg Terminal. LEARN MORE