DreamWorks, SanDisk, Southern Copper, Yahoo!: 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 9:40 a.m. in New York.

ACI Worldwide Inc. (ACIW US) declined 2.8 percent to $30.55. The maker of electronic-transaction software said it received a request for additional information from the U.S. Justice Department regarding its takeover of S1 Corp. (SONE US), the Norcross, Georgia-based provider of Internet-based financial services. S1, which was also to submit information, slipped 1.4 percent to $9.76.

Cooper Tire & Rubber Co. (CTB US) declined 5.8 percent to $13.50. The tire maker had third-quarter profit from continuing operations of 27 cents a share, missing the average analyst estimate of 33 cents a share.

DreamWorks Animation SKG Inc. (DWA US) lost 8.5 percent to $18.41. The independent film studio’s “Puss in Boots” movie opened with $34 million this weekend, the lowest debut for the studio in five years, the Los Angeles Times reported.

Interactive Brokers Group Inc. (IBKR US) rose 2.5 percent to $15.60. MF Global Holdings Ltd. (MF US) is nearing a deal to file for chapter 11 bankruptcy protection as soon as today and to sell assets to Interactive Brokers Group, an electronic market maker and securities firm, the Wall Street Journal reported, citing an unnamed person familiar with the matter.

Momenta Pharmaceuticals Inc. (MNTA US) rallied 19 percent to $14.57. The Cambridge, Massachusetts-based biotechnology company said it obtained a preliminary injunction against Amphastar Pharmaceuticals Inc., Watson Pharmaceuticals Inc. (WPI US) and International Medical Systems Ltd., barring the companies from selling their generic Lovenox.

Newmont Mining Corp. (NEM US) slipped 1.9 percent to $67.20. The largest U.S. gold producer had its rating cut to “sector underperformer” from “sector perform” at Canadian Imperial Bank of Commerce.

SanDisk Corp. (SNDK US) lost 2.9 percent to $51.86. The maker of flash-memory cards was cut to “neutral” from “buy” at Sterne, Agee & Leach Inc., which said the potential for further gains in the stock is limited after a 65 percent rebound since Aug. 22.

Southern Copper Corp. (SCCO US) decreased 3.5 percent to $31.33. Grupo Mexico SAB (GMEXICOB MM) dropped its July 2010 proposal to merge its Southern Copper and Asarco units, citing “recent discussions” and other developments. Grupo Mexico owns 81 percent of Phoenix-based Southern Copper, the biggest producer of the metal in Peru.

Yahoo! Inc. (YHOO US) fell 4.94 percent to $15.75. The U.S. Web portal exploring strategic options is leaning toward selling its Asian assets and redistributing the proceeds to shareholders, rather than selling itself to a group of buyers, according to five people familiar with the situation.

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