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.
Arctic Cat Inc. (ACAT) surged 20 percent to $28.58, the highest price since March 2005. The snowmobile maker forecast earnings in 2012 of at least $1.60, surpassing the average analyst estimate of $1.22.
AT&T Inc. (T) fell the most in the Dow Jones Industrial Average, sinking 2.5 percent to $29.45. The largest U.S. phone company predicted 2012 earnings that trailed analysts’ estimates as record demand for smartphones such as the iPhone drive up subsidy costs.
Carbo Ceramics Inc. (CRR) fell 21 percent, the most since its 1996 initial public offering, to $104. The maker of ceramic granules used in oil drilling reported fourth-quarter sales and earnings that missed analysts’ estimates.
Caterpillar Inc. (CAT) gained 2.1 percent, the most in the Dow Jones Industrial Average, to $111.31. The world’s largest construction and mining-equipment maker reported fourth- quarter earnings and gave a full-year profit forecast that topped analysts’ estimates as demand rose for shovels and trucks.
Covance Inc. (CVD) slumped 8.1 percent, the most since July 2010, to $43.31. The contract research organization for pharmaceutical companies said it expects first-quarter per-share profit to be “in the low $0.60 range.” Analysts had forecast 67 cents, on average.
E*Trade Financial Corp. (ETFC) (ETFC US) declined 14 percent, the most in the Standard & Poor’s 500 Index, to $7.99. The online brokerage reported fourth-quarter revenue was $475 million, missing the average analyst estimate of $489.1 million. The company had its rating cut to “hold” from “buy” at Sandler O’Neill & Partners LP.
Greenhill & Co. (GHL US) rallied 12 percent, the most since November 2008, to $49.36. The advisory firm founded by Robert Greenhill reported fourth-quarter profit increased eightfold as advisory-fee revenue surged.
J.C. Penney Co. (JCP) rose 19 percent, the most since at least 1980, to $40.72. The fourth-largest U.S. department-store chain said cost reductions from new Chief Executive Officer Ron Johnson’s turnaround plan may boost 2012 profit more than analysts estimated.
Logitech International SA (LOGI) sank 12 percent to $7.20, the lowest price since August 2003. The world’s biggest maker of computer mice cut full-year forecasts for the third time, citing the weaker euro and declining demand.
LSI Corp. (LSI) gained 11 percent to $7.85, the highest price since July 2007. The maker of chips used in computer disk drives forecast first-quarter sales from continuing operations will be at least $550 million, exceeding the average analyst estimate of $508.7 million.
Medidata Solutions Inc. (MDSO) rose 3.5 percent, the most since Dec. 9, to $21.39. The provider of clinical data management software will replace RightNow Technologies Inc. (RNOW) in the Standard & Poor’s SmallCap 600 Index after the close of trading on Jan. 27. The change is being made because RightNow is being acquired by Oracle Corp. (ORCL) .
Mellanox Technologies Ltd. (MLNX) jumped 16 percent, the most since February 2007, to $36.24. The adapter maker reported revenue and profit that topped analysts’ estimates and forecast a 47 percent increase in first-quarter sales.
Micromet Inc. (MITI) surged 32 percent to $10.94, the highest price since August 2005. The biotechnology company agreed to be acquired by Amgen Inc. (AMGN US) for $11 a share in cash, a 33 percent premium to the stock’s close yesterday.
Momenta Pharmaceuticals Inc. (MNTA) dropped 21 percent to $15.13 for the biggest retreat in the Russell 2000 Index. A U.S. appeals court granted Amphastar Pharmaceuticals Inc. a stay pending appeal of a ruling involving generic forms of Lovenox. Momenta has won an order that prevented Amphastar from selling a copy of the blood-thinner.
Monster Worldwide Inc. (MWW) declined 20 percent, the most since January 2011, to $7.15. The world’s largest online- recruiting company predicted profit of 4 cents a share at most in the first quarter. That trailed the 9-cent average analyst estimate in a Bloomberg survey.
Netflix Inc. (NFLX) rallied the most in the S&P 500, rising 22 percent to $116.01. The online and mail-order video- rental service said it contained a subscriber revolt in the fourth quarter and forecast improving margins for its streaming business.
Parametric Technology Corp. (PMTC) surged 19 percent to $25.64, the highest price since July 2001. The maker of industrial software boosted its full-year earnings forecast.
SanDisk Corp. (SNDK) dropped 11 percent, the most since January 2010, to $46.39. The biggest maker of flash-memory cards gave a sales forecast that fell short of estimates, citing lower prices for chips that store data in mobile phones.
Time Warner Cable Inc. (TWC) rose 7.8 percent, the most since April 2009, to $74.51. The second-largest U.S. cable- television provider said it would buy back $4 billion of shares after reporting fourth-quarter profit that exceeded analysts’ estimates on added broadband subscriptions.
United Continental Holdings Inc. (UAL) rose 6.3 percent to $21.70, the highest price since July 13. The world’s largest carrier said fourth-quarter profit slid 32 percent, less than analysts anticipated, as higher fares helped mute fuel costs.
United Rentals Inc. (URI) gained 8.9 percent to $37.87, the highest price since 1998. The construction-equipment rental company reported fourth-quarter earnings excluding some items of 82 cents a share, surpassing the average forecast of 59 cents by analysts in a Bloomberg survey.
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