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Monday's biggest gaining and declining stocks

CHICAGO (MarketWatch) -- Here are some of Monday's biggest gaining and declining stocks in U.S. trading:

Gainers

Coventry Health Care Inc. (CVH) shares rose 20%. Aetna Inc. (AET) confirmed plans to buy Coventry for $5.7 billion in cash and stock, a move that will make Aetna one of the largest providers of government-financed health care. Shares of Aetna gained 5%. Read more about the Aetna-Coventry plan. .

M&A news led Western Liberty Bancorp shares (WLBC) to rise 34%, after Phoenix-based Western Alliance Bancorp. (WAL) announced it would buy Western Liberty for $55 million.

First Solar Inc. (FSLR) rose 6%, following gains made last week by the solar-energy-cell producer, among other energy stocks.

Decliners

ATP Oil And Gas Corp. shares (ATPG) fell 35% after the Gulf of Mexico oil company announced Monday a plan to file for Chapter 11 bankruptcy.

Lowe's Cos. (LOW) fell 6% after the home-improvement retailer posted financial results. The company said second-quarter earnings fell 10% as margins were squeezed, while same-store sales declined slightly. Lowe's also cut its projections for the year. Get more details about Lowe's second quarter.

Zagg Inc. (ZAGG) fell 13%. The company said Friday that co-founder Robert G. Pedersen II had resigned as chief executive and chairman. Chief Operating Officer Randall Hales was appointed interim chief while the board searches for a permanent replacement. See more on the latest developments at Zagg.