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.
Aeropostale Inc. (ARO US) rose 8.7 percent, the most since Aug. 21, to $25.61. The clothing retailer has hired Barclays Plc to fend off any buyout approach by private-equity firms, New York Post reported, citing a person close to the situation.
Axcelis Technologies Inc. (ACLS US) rallied 14 percent to $3.44 for the second-biggest advance in the Russell 2000 Index. The maker of plasma cleaning systems said it was selected as “the process tool of record by one of the world’s largest semiconductor manufacturers.”
Ciena Corp. (CIEN US) rose 8.1 percent to $20.86, the highest price since July 2008. The maker of network gear for the biggest U.S. phone companies was rated “buy” in new coverage at Deutsche Bank AG.
Discover Financial Services (DFS US) slid 3.1 percent to $18.53 for its biggest decline since Nov. 16. The payments processor posted fourth-quarter sales that missed the average estimate of 10 analysts surveyed by Bloomberg.
Energizer Holdings Inc. (ENR US) rose 6.4 percent, the most since July 27, to $74.34. Procter & Gamble Co.’s Duracell unit plans to match the first-quarter price increases planned by the maker of Energizer and Eveready batteries, analysts at BMO Capital Markets Corp. and Bank of America Corp. said.
Gentiva Health Services Inc. (GTIV US) gained 6.3 percent, the most since May 24, to $24.60. The home-nursing company forecast 2011 earnings of at least $2.70 a share, above the $2.69 average estimate of analysts.
Herman Miller Inc. (MLHR US) advanced 9.2 percent to $25.26, the highest price since September 2008. The maker of ergonomically designed furniture reported second-quarter adjusted earnings of 29 cents a share, beating the average analyst estimate by 1 cent.
InfoLogix Inc. (IFLG US) more than doubled to $4.64 for the biggest advance since Feb. 22. The producer of computer systems agreed to be bought by Stanley Black & Decker Inc. (SWK US) for $4.75 a share.
Las Vegas Sands Corp. (LVS US) rose 7.1 percent to $45.25, the biggest gain since Oct. 28. The U.S. casino company expanding in Asia is a buying opportunity after a decline, according to Morgan Stanley. The shares fell 18 percent from Dec. 1 through yesterday.
MasterCard Inc. (MA US) fell 10 percent, the most since October 2008, to $223.49. The world’s second-biggest payments network dropped after the Federal Reserve proposed rules that may slash debit card interchange fees by 90 percent. Visa Inc. (V US), the largest consumer payments network, declined 13 percent to $67.19.
Nasdaq OMX Group Inc. (NDAQ US) rose 4.1 percent to $23.46, the highest price since March 2009. The owner of the Nasdaq Stock Market said it plans to raise $370 million through a debt offering to help finance the repurchase of $497 million of common stock.
Neuralstem Inc. (CUR US) rallied 6.5 percent, the most since Sept. 29, to $2.31. The biotherapeutics company said it won approval from the U.S. Food and Drug Administration to start a trial on NSI-189, a compound for major depression.
Nordson Corp. (NDSN US) rose 3.9 percent to $90.60, the highest price in data going back to 1984. The maker of adhesive equipment forecast first-quarter earnings of at least $1.03 a share, exceeding the 94-cent average analyst estimate.
PURE Bioscience (PURE US) fell 9.2 percent to $2.38 for the third-biggest drop in the Russell 2000. The maker of antimicrobials said its first-quarter loss widened to 6 cents a share from 5 cents.
Regis Corp. (RGS US) fell 12 percent to $16.05 for the biggest decline in the Russell 2000. The board of the hair salon operator determined “the most appropriate” course to maximize shareholder value was to remain an independent public company after a review of strategic alternatives. The Edina, Minnesota-based company was cut to “hold” at Soleil Securities Corp.
Scholastic Corp. (SCHL US) declined 8.6 percent to $27.20 for its biggest retreat since December 2008. The children’s book publisher reduced the high end of its annual sales forecast, projecting $1.95 billion at most.
SciClone Pharmaceuticals Inc. (SCLN US) tumbled 6 percent, the most since Aug. 10, to $3.75. The drugmaker will end development of SCV-07 for the treatment of hepatitis C after a clinical trial didn’t meet its primary endpoint.
Swift Transportation Co. (SWFT US) rose 0.9 percent to $11.10 on the first day of trading. The biggest truckload carrier in North America raised $806 million after cutting the price for the second-largest U.S. initial public offering of 2010.
Transocean Ltd. (RIG US) dropped 3.6 percent to $69.31 for its biggest decline since Oct. 19. The owner of the rig that exploded in the Gulf of Mexico in April was cut to “equalweight” from “overweight” at Morgan Stanley after the U.S. government sued companies including Transocean over the oil spill.
Winnebago Industries Inc. (WGO US) rose the most in the Russell 2000 Index, rallying 14 percent to $14.96. The biggest U.S. maker of motor homes reported first-quarter profit and sales that beat analysts’ estimates.
Wynn Resorts Ltd. (WYNN US) gained 4.8 percent, the most since Oct. 11, to $105.59. The owner of the Wynn and Encore casinos was raised to “overweight” from “neutral” at JPMorgan Chase & Co.