Among the companies with shares expected to actively trade in Wednesday's session are Dow Chemical Co. (DOW), Tupperware Brands Corp. (TUP) and Yahoo Inc. (YHOO).

Air Methods Corp. (AIRM) issued a preliminary fourth-quarter profit outlook that missed Wall Street's expectations, due to flight volume weakness and poor weather that led to cancellations. Shares dropped 5.8% to $48.40 premarket.

Dow Chemical swung to a fourth-quarter profit on improved sales in most of its operating businesses. Results solidly topped expectations and the company disclosed plans to boost its quarterly dividend by 15% to 37 cents a share and increase its stock buyback authorization to $4.5 billion. Shares climbed 6.4% to $45.80 in premarket trading.

Electronic Arts Inc. (EA) executives are excited about new videogame consoles, but sales of games for older devices have dropped off more quickly than expected, causing pain in the latest quarter and dragging the company's revenue expectations lower. Shares edged up 1.7% to $25.30 premarket.

EMC Corp. (EMC) said its fourth-quarter earnings grew 17% as the data-storage provider benefited from strong growth in its emerging storage business. However, its stock declined 2.3% premarket to $24.81 after the company forecast 2014 results below market expectations.

Pawnshop operator EZCorp Inc. (EZPW) reported better-than-expected fiscal first-quarter results as sales in existing stores were strong despite a soft U.S. holiday shopping season. Shares surged 16% to $10.80 premarket.

Bio-technology company Fluidigm Corp. (FLDM) agreed to acquire DVS Sciences Inc. for about $208 million to expand its portfolio of single-cell technology products. DVS manufactures and distributes bioanalytical products for biological research and future clinical applications. Shares dropped 2.3% to $40.02 premarket.

Rockwell Automation Inc. (ROK) said its fiscal first-quarter earnings jumped 23% as operating margins widened and sales in both segments increased. Results topped estimates, pushing shares up 2.6% to $118 premarket.

Tupperware Brands said its fourth-quarter earnings rose 10% as sales improved in its emerging markets, offsetting weakness in established areas, but the results missed the company's own estimates and it offered an outlook below consensus estimates. Shares dropped 6.9% to $78.03 premarket.

Valero Energy Corp. (VLO) said its fourth-quarter profit rose 28% as the oil refiner got a boost from the spinoff of gas-station retailer CST Brands Inc. (CST). Results easily topped estimates.

Yahoo reported its revenue fell 1.7% in the fourth quarter, minus commissions paid to partners for Web traffic, the fourth straight quarter without growth. The company's closely watched display-ad revenue, which makes up about 41% of the company's total, fell another 5.6% even as the overall market grows quickly. Shares dropped 5% to $36.32 premarket.

 
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ACE Ltd.'s (ACE) fourth-quarter profit rose 30% as the global insurer benefited from premium revenue growth globally. Adjusted earnings topped analysts' expectations and the company said global property and casualty net premiums written, excluding agriculture, rose 13% in the quarter.

Amgen Inc. (AMGN) said its fourth-quarter earnings rose 30% as the biopharmaceutical company reported sales growth for most of its products.

Emerson Radio Corp. (MSN) said the consumer-electronics distributor said it has allowed a special committee to evaluate possible strategic alternatives to enhance shareholder value.

Energizer Holdings Inc. (ENR) said its fiscal first-quarter earnings fell 17% as sales at its household products business continued to decline and increased competition weighed on the personal-care segment. Energizer lowered its full-year earnings outlook and also increased the scope of its restucturing project.

Express Scripts Holding Co. (ESRX) named Tim Wentworth, an executive who joined the pharmacy-benefit manager when it merged with Medco Health Solutions in 2012, to serve as the company's president.

Flowserve Corp. (FLS) laid-out its targets for the recently started year, as the diversified manufacturer said it remains "cautiously optimistic" for the new year.

Hess Corp. (HES) said its fourth-quarter income soared as the oil and gas company benefited from recent asset sales. Earnings topped expectations.

JetBlue Airways Corp. (JBLU) said its fourth-quarter earnings surged on improved passenger traffic and stronger revenue that topped consensus views. Results from the year earlier were hurt by impacts from Superstorm Sandy.

Marathon Petroleum Corp. (MPC) said its fourth-quarter earnings fell 17% as the refining-and-marketing segment posted weaker results and higher costs overshadowed improved revenue. Results easily topped expectations.

Phillips 66 (PSX) said its fourth-quarter earnings rose 17%. "We ran well during the fourth quarter, allowing us to capitalize on favorable crude differentials while exporting a record volume of refined products," Chief Executive Greg Garland said. Results topped expectations.

Samsung Electronics Co. (005930.SE, SSNHZ) and Tessera Technologies Inc. (TSRA) said they reached new patent license agreements.

Southern Co. (SO) said its fourth-quarter earnings rose 8.1% as the electric-power company benefited from better weather patterns and an increase in industrial and residential energy sales. Chief Executive Thomas Fanning said the company saw stronger economic growth in the second half of 2013 compared with the first six months of the year.

VMware Inc. (VMW) warned it expects its operating margins to decline following its acquisition of AirWatch later this year. The virtualization-software maker estimated that margins in its second quarter, ending in June, would decline 1.5% to 2% sequentially.

Write to John Kell at john.kell@wsj.com and Lauren Pollock at lauren.pollock@wsj.com

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