Among the companies with shares expected to actively trade in Monday's session are Citigroup Inc. (C), Riverbed Technology Inc. (RVBD) and Abbvie Inc. (ABBV).

Citigroup said its second-quarter profit plunged 96% from a year earlier, as the bank took a large charge tied to a $7 billion deal the Justice Department to settle allegations it sold shoddy mortgages before the financial crisis. But shares rose 3.9% to $48.82 in premarket trading as the company's results solidly beat the estimates of analysts polled by Thomson Reuters, while investors continued to show relief the bank had struck a deal with the Justice Department.

Riverbed Technology said it lowered its revenue guidance for the company's second quarter as sales fell short of company targets, especially in North America. Shares fell 4.8% to $19.38 premarket.

U.S. drug giant Abbvie is close to clinching a deal to buy Dublin-based Shire PLC (SHPG, SHP.LN) for more than $53 billion, in what would be one of the largest so-called inversion deals through which U.S. companies are seeking a lower corporate tax burden. Shire American depositary shares rose 1.7% to $253.17, while Abbvie shares slipped 2.7% to $53.50 premarket.

Abbott Laboratories (ABT) said it will sell a portion of its generics pharmaceuticals business to Mylan Inc. (MYL) in an all-stock transaction valued at $5.3 billion, another health-care deal driven in part by tax advantages. Mylan shares rose 4.1% to $52.25, while Abbott shares rose 1.9% to $42.10 premarket.

A U.S. Food and Drug Administration office has approved Salix Pharmaceuticals Ltd.'s (SLXP) appeal to gain approval for expanded usage of a constipation drug it licensed from Progenics Pharmaceuticals Inc. (PGNX), the companies said. Shares of Progenics climbed 12% to $4.75 premarket.

Harmonic Inc. (HLIT) lowered its guidance for the second quarter as the video infrastructure services company said it has seen decreased demand in its video business. Shares fell 13% to $6.21 premarket.

 
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Quebec-based drug company Duchesnay Inc. has sued Actavis PLC (ACT), seeking to block a generic version of morning-sickness drug Diclegis.

Alcoa Inc. (AA) filed a shelf registration to offer up to $5 billion in mixed securities from time to time. The New York-based aluminum company didn't disclose any other information, including the timing or underwriters of any possible future offerings in a filing on Friday with the Securities and Exchange Commission.

Allergan Inc. (AGN) raised doubts about Valeant Pharmaceuticals International Inc.'s (VRX) commitment to improving its transparency, as it reiterated its opposition to a $53 billion hostile takeover bid from Valeant and activist investor William Ackman.

ConAgra Foods Inc. (CAG) acquired Chinese potato processor TaiMei Potato Industry Ltd. for $93 million, as part of its ongoing effort to expand its international footprint.

Ebay Inc. (EBAY) and Sotheby's (BID) said they are building an online platform that will enable users to view and acquire art, antiques and collectibles online, as first reported by the New York Times. The partnership comes as more collectors are buying high-end items online and from mobile devices.

Exterran Partners L.P. (EXLP) will acquire natural-gas compression assets from MidCon Compression L.L.C., a subsidiary of Chesapeake Energy Corp. (CHK), for about $135 million.

Kindred Healthcare Inc. (KND) boosted its offer to about $589 million to buy a smaller stake in Gentiva Health Services Inc. (GTIV), as it tries to draw the home health-care company to the negotiating table.

Lexmark International Inc. (LXK) again increased its offer for Sweden's ReadSoft AB, returning fire in its bidding war with Hyland Software U.K.

Vulcan Materials Co. (VMC) said its board named J. Thomas Hill as the company's new chief executive, succeeding Douglas James.

Weatherford International PLC (WFT) agreed to sell its land rig operations in Russia and Venezuela to Russia's state-controlled oil giant Rosneft for $500 million in cash, as the oil-field services company continues to slim down and focus on its core businesses.

Yahoo Inc. (YHOO) acquired video-streaming startup RayV Inc. Financial terms weren't disclosed.

 
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Johnson Controls Inc.'s (JCI) joint venture with a unit of SAIC Motor, China's enormous state-owned car market, gives added credibility to the company's vow to manage its capital more aggressively, a commitment that could have a very favorable long-term effect on its share price, according to a recent report in Barron's. The deal gets Johnson Controls out of the day-to-day slough of operating in a low margin, slow-growth business and gives it a 30% stake in a SAIC division. The joint venture will have about $7.5 billion in annual revenues, margins of roughly 6%, and top-line growth of 8% once it gets underway in 2015. Johnson Controls shares rose 1% to $51.22 premarket.

French wireless carrier Orange (ORAN, ORA.FR), formerly known as France Telecom, has seen its American depositary shares climb 60% since its name change and could see more growth, according to Barron's. Despite various challenges, including falling revenue and the French government's 27% stake in the company, the shares look likely to continue their roll, and could return 30% over the next year. Competitive pressures are easing and industry pricing is stabilizing. The shares still look cheap and Orange could generate about $4.5 billion in annual free cash in the next five years. ADSs edged up 1.1% to $15.57 premarket.

Write to Anna Prior at anna.prior@wsj.com and Maria Armental at maria.armental@wsj.com

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