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Market Insider | What's Shaking | Earnings to Watch | Before the Bell

Check out which companies are making headlines before the bell on Monday:

Campbell Soup — The food maker reported fiscal third quarter profit of 62 cents per share, excluding certain items, six cents above estimates, with revenues also beating consensus. It also raised its full year forecast. Campbell CEO Denise Morrison said the company was generally pleased with the quarter, though she expressed disappointment with the performance of certain units such as beverages.

Yahoo — Sources tell CNBC the company's board has approved a deal to buy blogging service Tumblr for $1.1 billion. Yahoo would not immediately confirm the deal, saying it does not comment on rumors or speculation, but does have a media event scheduled for later today.

Warner Chilcott — The drug maker will be bought by Actavis (ACT) in an $8.5 billion stock transaction. Actavis itself has been trying to fend off takeover overtures from companies like Mylan and Valeant Pharmaceuticals.

Boeing — The company's 787 jets will return to service for United Airlines today, four months after being grounded for battery problems.

Elan — Elan has struck several deals as it continues to fend off a $5.7 billion takeover bid from U.S. based investor Royalty Pharma. Elan has bought two privately held drug makers, is spinning off an experimental Alzheimer's treatment into a private company, and is buying back more shares.

Acquity Group — Acquity will be acquired by Accenture for $13 per share in cash, more than double Acquity's Friday closing price. Accenture, a major U.S.consulting firm, wants to expand its digital marketing services.

Chesapeake Energy — The company has hired Anadarko Petroleum executive Robert Lawler as chief executive. He replaces interim CEO Steven Dixon, who took over for departed co-founder Aubrey McLendonon on April 1.

General Electric — The company's GE Capital unit plans to pay GE $6.5 billion in dividends this year, along with $4.5 billion in special dividends.

Bank of America —The bank's stock has been downgraded to "market perform" from "outperform" at Keefe, Bruyette & Woods. KBW also downgraded BlackRock, TD Ameritrade, and Charles Schwab to "market perform" from "outperform".

T-Mobile US — Deutsche Bank has upgraded the mobile carrier's shares to "buy" from "hold", saying the company's improved operating momentum looks sustainable.

Priceline.com —Deutsche Bank has upgraded the travel services site's shares to "buy" from "hold", citing stabilizing profit margins and calling Priceline the "clear global secular winner" in the online travel agent space.

(Read More: See CNBC's Market Insider Blog)

—By CNBC's Peter Schacknow

Questions? Comments? Email us at marketinsider@cnbc.com