Among the companies whose shares are expected to actively trade in Tuesday's session are Red Hat Inc. (RHT), AT&T Inc. (T) and Sprint Nextel Corp. (S).

Red Hat's fiscal third-quarter earnings rose a stronger-than-expected 47% as the software provider's margins continued to expand. But shares dropped 8.7% to $42.06 after hours as revenue rose in line with expectations rather than topping estimates, as it had in previous quarters.

AT&T bowed to U.S. antitrust authorities and withdrew its $39 billion acquisition of T-Mobile USA, ending a nine-month fight to complete a deal many saw as a long shot and leaving both carriers groping for a way forward. The high-profile defeat came after AT&T had already pulled its application from the Federal Communications Commission and put on hold efforts to fight the Justice Department's suit to block the deal. AT&T shares fell 0.4% to $28.64 after hours. Competitor Sprint, meanwhile, jumped 6% to $2.29 on the news. Clearwire Corp. (CLWR) a major Sprint partner, was up 5.4% at $2.14.

 
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AllianceBernstein Holding LP (AB) said the leader of its sell-side research subsidiary would assume the role of chief operating officer of the fund manager, as part of organizational changes to streamline management.

Amgen Inc. (AMGN) and Watson Pharmaceuticals Inc. (WPI) agreed to work together on several cancer antibody biosimilar products, which they expect to sell under a joint label. Under the deal, Amgen will lead the development, manufacturing and initial commercialization of the oncology antibody products. Watson will initially receive royalties and sales milestones from product revenues, and it will contribute up to $400 million in codevelopment costs as well as share product development risks.

Commercial Metals Co.'s (CMC) board recommended that shareholders reject Carl Icahn's unsolicited $1.73 billion tender offer as the scrap-metal processor also projected fiscal first-quarter earnings far above Wall Street estimates thanks to a tax benefit.

Moody's Investors Service put Constellation Energy Group Inc. (CEG) on review for a possible upgrade from the brink of junk after it and proposed merger partner Exelon Corp. (EXC) reached secured support from Maryland officials.

Standard & Poor's Ratings Services heightened the chance of an upgrade for Pall Corp. (PLL), citing solid credit metrics and good operating performance by the maker of filtration and purification products.

Sempra Energy (SRE) said it will likely meet or exceed the high end of its previous full-year earnings guidance following broad-based improvement in operating performance. The power company is slated to report its full-year results on Feb. 28.

Southwestern Energy Co. (SWN) said it plans to boost its capital investment to $2.3 billion in 2012, compared with this year's $2.1 billion outlay, as it looks to boost natural gas production in regions like Pennsylvania's Marcellus Shale region.

Vulcan Materials Co. (VMC) said it will streamline its business units and could cut about 200 jobs in a bid to lower costs amid a hostile takeover bid.

 
    -By Dow Jones Newswires; write to hotstocks@dowjones.com 
 
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