Among the companies with shares expected to actively trade in Wednesday's session are Devon Energy Corp. (DVN) and Zale Corp. (ZLC).

CF Industries Holdings Inc.'s (CF) fourth-quarter profit slid 31% as the fertilizer producer's sales were stung by lower prices and higher natural gas costs. The results, while lower than last year, still exceeded Wall Street's expectations. Shares edged up 3.9% to $235 premarket.

Columbia Sportswear Co.'s (COLM) fourth-quarter profit slipped 7% as an asset impairment charge weighed on the active outdoor apparel maker's bottom line, masking a rise in revenue. Shares rose 6.4% to $83.70 premarket.

Devon Energy agreed to sell most of its conventional assets in Canada to Canadian Natural Resources Ltd. (CNQ, CNQ.T) for $2.8 billion. It also reported swinging to a fourth-quarter profit amid increased production and higher average selling prices for oil and natural gas. Shares edged up 1.9% to $64.10 premarket.

Eli Lilly & Co. (LLY) said Wednesday that its ramucirumab drug reached its primary endpoint in a Phase III study for lung cancer treatment. Shares rose 4.5% to $57.76 in recent premarket trading.

Herbalife Ltd. (HLF) raised its outlook for the current quarter and year, pointing to recent share repurchases, as the nutritional-supplements maker said its fourth-quarter profit grew 10%. Herbalife also posted higher sales across almost all markets it serves in the latest quarter. Shares edged up 2.1% to $70.36 premarket.

La-Z-Boy Inc.'s (LZB) fiscal third-quarter profit slipped 3.4% as the company posted a loss tied to the sale of its Bauhaus U.S.A. unit, and bad weather weighed on sales. The furniture company's results missed Wall Street's expectations, pushing shares down 9.6% to $24.50 premarket.

Mattress Firm Holding Corp. (MFRM) tempered expectations for 2013, as the company said results were hurt by poor winter weather and lower margins tied to efforts to drive sales and traffic during the final quarter of the year. Shares slumped 9.9% to $37.17 premarket.

Nabors Industries Ltd. (NBR) said fourth-quarter earnings surged despite only modest revenue growth as the oil-field services company had been hurt by big write-downs and other items a year earlier. Shares climbed 3.2% to $19.25 premarket.

Omnicare Inc. (OCR) swung to an unexpected fourth-quarter loss on write-downs related to its hospice pharmacy business and certain certain retail operations that have been classified as discontinued operations. Results missed expectations, sending shares down 5.5% to $61 premarket.

Potbelly Corp. (PBPB) swung to a loss in the fourth quarter as it posted higher overall expenses and a meager increase in company-operated same-store sales. Shares dropped 5.4% to $21.20 premarket.

Six Flags Entertainment Corp. (SIX) said its fourth-quarter revenue rose more than expected on higher admissions and an increase in in-park spending, sponsorships and accommodations. Shares edged up 3.3% to $39.50 premarket.

Terex Corp. (TEX) swung to a fourth-quarter profit as the construction-machinery maker reported higher sales across most business segments, led by its aerial-work-platforms segment. But shares slid 6% to $41.32 premarket on a disappointing earnings outlook for 2014.

Ultra Clean Holdings Inc. (UCTT) swung to a fourth-quarter profit as the company recorded a surge in revenue. The company also issued a rosy first-quarter outlook, pushing shares up 17% to $13.94 premarket.

Signet Jewelers Ltd. (SIG) agreed to buy smaller rival Zale for about $690 million, significantly expanding the jewelry retailer's presence in North America. Signet will offer $21 in cash for each Zale share, representing a 41% premium over Tuesday's closing price. Zale shares jumped to $20.87 premarket and Signet climbed 12% to $88.40.

 
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Analog Devices Inc. (ADI) said fiscal first-quarter earnings rose 16% as the chip maker benefited from a modest revenue increase, stronger margins and fewer restructuring-related expenses.

Broadcom Corp. (BRCM) said Tuesday that it will sell certain assets and non-exclusive licenses to QLogic Corp. (QLGC) for $147 million in cash.

Community Health Systems Inc. (CYH) said its fourth-quarter earnings fell 55% as the rural hospital operator reported a decline in revenue and lower admissions.

Crossroads Systems Inc. (CRDS) filed a complaint Tuesday against Cisco Systems Inc., NetApp Inc. and Quantum Corp., alleging patent infringement, the company said.

Group 1 Automotive Inc. (GPI) said severe winter weather and resulting lost sales will likely dent its first-quarter results by 15 cents to 20 cents a share.

InnerWorkings Inc. (INWK) posted fourth-quarter revenue growth that beat expectations with a boost from acquisitions and growth in its enterprise segment.

MGM Resorts International (MGM) said its fourth-quarter revenue improved more than expected as the casino operator continued to benefit from stronger demand in Macau.

Panera Bread Co.'s (PNRA) fourth-quarter profit rose 5.1% as higher checks helped same-store sales increase, though fewer transactions were rung up.

SWS Group Inc. (SWS) on Tuesday confirmed that it has received a competing offer for the company from Esposito Global, which values the financial services company at about $265 million.

Thor Industries Inc. (THO) has said strong demand for motorhomes has led the company to expand production capacity with the purchase of a Indiana facility that was previously used to produce Monaco vehicles.

Write to John Kell at john.kell@wsj.com

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