NYSE Euronext, Stillwater, YRC Worldwide: U.S. Equity Movers

Shares of the following companies are having unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 1:40 p.m. in New York.

Arch Chemicals Inc. (ARJ) surged 12 percent to $47.10 for the second-biggest gain in the Russell 2000 Index. The Norwalk, Connecticut-based producer of dry chlorine for swimming pools agreed to be bought for $47.20 per share, or $1.2 billion by Lonza Group Ltd. (LONN VX).

Fabrinet (FN) fell 5.6 percent to $22.44 after dropping as much as 15 percent, the most intraday since March 9. Oclaro Inc. (OCLR) delivered a notice to the maker of optical telecommunications equipment to terminate a supply agreement, according to a regulatory filing.

Lam Research Corp. (LRCX) rose 2.3 percent to $45.20 and climbed 4.8 percent earlier, the most intraday since May 6. The maker of chip-manufacturing equipment was raised to “buy” from “sell” at Citigroup Inc. (C), which increased the price estimate to $62 a share from $43.

Micromet Inc. (MITI) gained 5.9 percent to $6.10 and climbed to $6.16 earlier, the highest intraday price since June 10. The biotechnology company said it entered into a collaboration agreement with Amgen Inc. (AMGN) , for research on BiTE antibodies against three undisclosed solid tumor targets, according to a statement. Amgen will have the right to pursue development and commercialization of BiTE antibodies against up to two of these targets selected by Amgen. Payments to Micromet may total as much as 695 million euros ($976 million), excluding development costs.

News Corp. (NWSA US) had the second-biggest retreat in the Standard & Poor’s 500 Index, sliding 7.3 percent to $15.54. U.K. political leaders pressed Rupert Murdoch to drop News Corp. (NWSA)’s bid to take full control of British Sky Broadcasting Group Plc (BSY) as the clamor over reports of phone hacking at the News of the World newspaper intensified.

NYSE Euronext (NYX) fell 5 percent to $33.66 after sliding 5.2 percent, the most intraday since May 16. The New York Stock Exchange owner that Deutsche Boerse AG (DBOEY) (DB1 GY) is buying in an all-stock deal slumped along with the Frankfurt- based company. Germany’s benchmark DAX Index slid 2.3 percent, its biggest drop since March 15, helping send Deutsche Boerse down 3.5 percent to 53.05 euros.

SonoSite Inc. (SONO) gained 3.1 percent to $36.34 and increased to $36.97 earlier, the highest intraday price since Feb. 23. The ultrasound-equipment maker will replace Kendle International Inc. (KNDL) in the Standard & Poor’s SmallCap 600 Index. Kendle, a contract researcher, is being acquired by Avista Capital Partners and Ontario Teachers Pension Plan.

Stillwater Mining Co. (SWC) tumbled 20 percent, the most intraday since December 2008, to $19.07. The Billings, Montana- based producer of platinum and palladium agreed to buy Peregrine Metals Ltd. (PGM CN) for $487.1 million.

YRC Worldwide Inc. (YRCW) surged 9.5 percent to $1.26 and jumped 23 percent earlier, the most intraday since June 27. The trucking company said it obtained commitments for a three- year $400 million asset-based loan to replace its existing asset-backed securitization facility.

To contact the reporter on this story: Cecile Vannucci in New York at cvannucci1@bloomberg.net

To contact the editor responsible for this story: Nick Baker at nbaker7@bloomberg.net