Shares of the following companies may have unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 7:55 a.m. in New York.
Index changes: Varian Semiconductor Equipment Associates Inc. (VSEA) will replace J. Crew Group Inc. (JCG US) in the Standard & Poor’s MidCap 400 Index, and Prestige Brands Holdings Inc. (PBH) will replace Varian in the S&P SmallCap 600, S&P said.
Adobe Systems Inc. (ADBE) : The top maker of graphic- design programs was raised to “overweight” from “neutral” at Atlantic Equities LLP. The 12-month price estimate is $45 a share.
Amazon.com (AMZN US): The world’s largest online retailer threatened to sever ties with more than 10,000 affiliates in California over a dispute about proposed taxation of Internet purchases.
Apple Inc. (AAPL) : The maker of the iPad is expected to introduce a new version today at an event in San Francisco. The new model is expected to have a more powerful processor, a thinner body and front- and rear-facing cameras, according to Yankee Group, a research and consulting firm. The iPad is one of Apple’s top sellers.
Family Dollar Stores Inc. (FDO) : The discount store chain was cut to “neutral” from “overweight at JPMorgan Chase & Co.
Google Inc. (GOOG) : The owner of the world’s most popular search engine was rated ‘‘buy’’ in new coverage at B. Riley & Co.
Mako Surgical Corp. (MAKO) : The medical device company posted a fourth-quarter loss that was wider than analysts’ average estimate. Revenue also fell short of projections.
MBIA Inc. (MBI) : The company that backed some of Wall Street’s most toxic debt securities settled $19 billion in guarantees with five financial institutions since September, resolving the obligations with a one-time payment.
McDermott International Inc. (MDR) : The offshore oil and gas contractor posted fourth-quarter revenue that fell short of estimates, Bloomberg data show.
MetLife Inc. (MET) declined 4.6 percent to $43.90. The largest U.S. life insurer said 146.8 million of its shares will be sold in public offerings as the firm raises funds to redeem securities given to American International Group Inc. in the purchase of a non-U.S. life insurer.
Nektar Therapeutics (NKTR) : The biotechnology company posted a fourth-quarter loss that was 29 percent narrower than analysts estimated. Revenue exceeded their average forecast, Bloomberg data show.
NYSE Euronext (NYX) : The biggest operator of U.S. stock exchanges and Tokyo Stock Exchange, the biggest stock market operator in Japan, said they may allow their customers to trade shares listed on each other’s venues.
Scientific Games Corp. (SGMS) : The New York-based gaming company reported a fourth-quarter loss of $1.74 a share.
Sina Corp. (SINA US) declined 3.4 percent to $79.25. The owner of China’s third-most visited website posted a loss in the fourth quarter, missing analysts’ estimates, because of an investment writedown. The company also agreed to pay $66 million for a stake in Mecox Lane Ltd. (MCOX) , a Shanghai-based online apparel retailer.
Staples Inc. (SPLS) : The office supply retailer reported fourth-quarter earnings of 39 cents a share excluding certain items, missing the average analyst estimate of 40 cents, Bloomberg data show.
TiVo Inc. (TIVO) : The digital-video recording pioneer reported a fourth-quarter loss of 30 cents a share, 6 percent wider than the average analyst estimate, Bloomberg data show.
VeriFone Systems Inc. (PAY) : The second-largest maker of electronic payment equipment forecast annual earnings and revenue that beat the average analyst estimate. The company also said earnings for the first quarter were 43 cents a share, more than the projected 39 cents, according to Bloomberg data.
Weatherford International Ltd. (WFT) slumped 15 percent to $19.90. The oilfield-services provider delayed its annual report and expects to make about $500 million in adjustments from 2007 to 2010, according to a regulatory filing with the U.S. Securities and Exchange Commission.
WisdomTree Investments Inc. (WSDT) : The asset-management firm was rated ‘‘buy” in new coverage at Sterne, Agee & Leach Inc.
Yahoo! Inc. (YHOO US) advanced 3.9 percent to $16.72. The most-visited U.S. Web portal is in talks to dispose of its 35 percent stake in its Japanese joint venture with Softbank Corp., according to two people briefed on the matter.
To contact the editor responsible for this story: Nick Baker at email@example.com