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.
Amylin Pharmaceuticals Inc. (AMLN US) surged 17 percent, the most since June 2010, to $14.26. The drugmaker and Alkermes Inc. (ALKS US) succeeded in their third attempt to gain U.S. clearance for Bydureon, a once-weekly version of Amylin’s diabetes shot. The Food and Drug Administration approved the drug for adults with Type 2 diabetes.
Bank of America Corp. (BAC US) decreased 3 percent to $7.07 for the biggest retreat in the Dow Jones Industrial Average. Goldman Sachs Group Inc. cut the lender’s rating to “neutral” from “buy,” saying it will be “challenging” for the company to reduce costs without weakening its earnings power.
Cell Therapeutics Inc. (CTIC US) fell 18 percent, the most since June 30, to $1.09. The company withdrew its new drug application for Pixuvri and said it plans to resubmit this year.
Emcore Corp. (EMKR US) dropped 12 percent, the most since Sept. 28, to $1.11. The solar-power company announced a 1-for-4 reverse stock split.
Gannett Co. (GCI US) had the biggest loss in the Standard & Poor’s 500 Index, sliding 6.9 percent to $14.17. The owner of 82 newspapers including USA Today reported its fourth straight drop in quarterly profit as advertising sales declined.
GTx Inc. (GTXI US) jumped 49 percent to $5.88 for the biggest increase in the Russell 2000 Index. The developer of a prostate-cancer drug had its share-price estimate increased to $19 from $8 by Citigroup Inc. on the expectation a clinical trial on Ostarine may succeed.
L&L Energy Inc. (LLEN US) climbed 7.6 percent, the most since Jan. 11, to $2.84. The U.S.-based company operating coal businesses in China said it is acquiring a 51 percent stake in the Weishe coal mine in China.
Nabors Industries Ltd. (NBR US) gained the most in the Standard & Poor’s 500 Index, adding 3.5 percent to $18.56. The world’s largest land-drilling contractor may be a takeover candidate after the departure of its 81-year-old chief executive officer, according to the options market. In the past two weeks, calls priced 10 percent above Nabors’ stock rose the most in 18 months versus puts on one-month contracts, signaling traders are anticipating an acquisition, said JonesTrading Institutional Services LLC.
Pep Boys -- Manny, Moe & Jack (PBY US) surged 24 percent. the most since May 2001, to $14.93. The Philadelphia-based automotive retailer agreed to be acquired by Gores Group for $1 billion including debt. The cash offer of $15 a share is 24 percent higher than Pep Boys’ closing price on Jan. 27.
PharMerica Corp. (PMC US) fell 12 percent to $12.61, the lowest price since Oct. 4. U.S. regulators sued Omnicare Inc. (OCR US) to block its $440.8 million takeover of the drug-supply company, a deal they said would increase prices for elderly nursing-home residents covered by Medicare.
St. Joe Co. (JOE US) slipped 5.8 percent, the most since Oct. 31, to $16.27. The largest landholder in northern Florida was cut to “market perform” from “outperform” at Raymond James Financial Inc.
Thomas & Betts Corp. (TNB US) surged 23 percent to $71.31 for the biggest gain in the Russell 1000 Index. ABB Ltd. agreed to buy the designer and maker of electrical components for $3.9 billion to expand its North American distribution network and boost sales of low-voltage gear. ABB offered $72 for each share of Thomas & Betts, 24 percent more than the close on Jan. 27.
US Airways Group Inc. (LCC US) advanced 4.2 percent to $8.52, the highest price since July 1. Delta Air Lines Inc. (DAL US) is weighing whether to make an offer for the smallest full-service domestic carrier, people familiar with the matter said.
U.S. Steel Corp. (X US) declined 3.9 percent, the most since Jan. 13, to $28.73. The steel company plans to sell U.S. Steel Serbia d.o.o. to Serbia for a nominal purchase price and take a non-cash charge of $400 million to $450 million in the first quarter.