Among the companies with shares expected to actively trade in Monday's session are Coventry Health Care Inc. (CVH) and Corinthian Colleges Inc. (COCO).

Aetna Inc. (AET) plans to buy Coventry Health Care Inc. (CVH) for $5.7 billion in cash and stock, a move that will make Aetna one of the largest providers of government-financed health care. Coventry shares jumped 17% to $40.95 premarket; Aetna is offering $42.08 a share. Known more for commercial health insurance, Aetna has been interested in expanding government-based health plans--Medicare for the elderly and Medicaid for the poor--that are growing as baby boomers and states look for help managing Medicaid costs.

Corinthian Colleges Inc. (COCO) swung to a loss in its fiscal fourth quarter, hurt by discontinued operations. The company also pointed to looming challenges for fiscal 2013, including the loss of federal funding for students who lack a high school diploma or GED. Shares slumped 6.1% to $2.30.

Lowe's Cos.'s (LOW) fiscal second-quarter earnings fell 10% as the home-improvement retailer saw its margins squeezed and same-store sales slip. Shares were down 6.1% at $26.16.

Mobile-device accessory maker ZAGG Inc. (ZAGG) said its co-founder, Robert G. Pedersen II, resigned as chief executive and chairman. Shares fell 6.2% to $7.90 premarket.

 
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ATP Oil & Gas Corp. (ATPG) filed for Chapter 11 bankruptcy protection Friday, hit by the rising costs associated with its deepwater drilling projects in the Gulf of Mexico.

Women's clothing retailer bebe Stores Inc. (BEBE) said its president, Emilia Fabricant, resigned for personal reasons, effective Friday.

Carmike Cinemas Inc. (CKEC) said it received a "nonspecific on Thursday.

Energy Transfer Partners LP (ETP) filed plans to offer up to $1 billion in common units and debt securities, as the pipeline operator looks to raise funds for general partnership purposes.

Meta Financial Group Inc. (CASH) unveiled plans to sell about $34.2 million in stock at a 6.8% discount to Friday's closing price, as the company looks to further capitalize its MetaBank unit.

Pharmacyclics Inc. (PCYC) said the enrollment of a fifth patient in a clinical trial for a non-Hodgkins lymphoma treatment has triggered another $50 million milestone payment from Janssen Biotech Inc., a unit of Johnson & Johnson (JNJ).

Write to Mia Lamar at mia.lamar@dowjones.com

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