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Chiquita Brands said it would merge with Fyffes in an all-stock deal that will create the world's biggest banana company in a move that sent shares of both firms jumping. 

Staples shares came under pressure after the office supply chain posted weak quarterly results, a disappointing current-quarter outlook and plans to shutter 225 stores. 

RadioShack shares nose-dived on Tuesday after the retailer posted a plunge in same-store sales.

Liberty Media dropped its bid to buy the rest of Sirius XM and unveiled plans to split into two tracking stocks, sending its shares jumping. 

Citigroup shares fell after the No. 3 U.S. bank said it would have to restate its fourth-quarter and full-year 2013 results after discovering fraud in its Mexico unit.

Citigroup shares fell after the No. 3 U.S. bank said it would have to restate its fourth-quarter and full-year 2013 results after discovering fraud in its Mexico unit.

TripAdvisor shares rallied in the pre-market as the online travel site's revenues surged.

Dreamworks shares came under pressure after its quarterly results ignited a selloff.

Office Depot shares plummeted Tuesday after the office-supply store posted an unexpected quarterly loss. 

Jos. A. Bank and Men's Wearhouse shares both got a boost after the clash between the two firms continued.

Groupon shares plummeted Friday on a grim current-quarter outlook. 

Forest Laboratories shares zipped higher in the pre-market on a buyout from Actavis.

Zale shares spiked after the company was bought out by rival Signet Jewelers. 

Weight Watchers shares nose dived after the firm cuts its forward outlook.

Time Warner Cable shares roared higher in early action after Comcast said it would buy the cable company for $45.2 billion. 

J.C. Penney shares zipped higher in pre-market action after the retailer posted upbeat holiday-season sales. 

Herbalife shares rallied ahead of the opening bell on a bright fourth-quarter outlook and bigger share buyback program.

Caterpillar shares rallied in the pre-market after the world's biggest heavy machinery maker revealed a fourth-quarter beat.

Microsoft shares rallied in the pre-market after the software giant posted better-than-expected quarterly results. 

Netflix shares surged on Thursday after the video-streaming service revealed much better-than-expected quarterly results.