Take a look at some of Monday's midday movers:
American Airlines Group Shares of what is now the world's largest carrier rose after the U.S. Supreme Court late Saturday denied a last-ditch bid to stop the merger of American Airlines and US Airways.
Given Imaging Shares of the medical technology company rallied after Covidien said it would purchase the Israeli company's outstanding stock for $30 a share, or roughly $860 million.
McDonald's Shares declined after the fast-food chain reported sales at stores open at least 13 months climbed 0.5 percent in November, beneath Wall Street's expectations.
Sysco Shares of the food distributor rallied after it agreed to purchase rival US Foods for about $3.5 billion in cash and stock.
QEP Resources The oil-exploration company fell after saying it would
WhiteWave Foods Shares of the food-packaging company rose after it said it would buy organic-food brand Earthbound Farm for about $600 million.
Ruby Tuesday The restaurant chain gained after Debtwire reported on Friday that it had hired Goldman Sachs Group to explore options including a sale.
Gilead Sciences Shares advanced after the Food and Drug Administration said it approved the company's hepatitis-C pill.
Dean Foods Its shares fell after Morgan Stanley cut its rating on the food producer to equal weight from overweight.
Abercrombie & Fitch Shares of the teen-apparel retailer dropped after it said it would extend CEO Mike Jeffries' contract for at least a year after it expires in February.
Edwards Lifesciences Shares slipped after the manufacturer of artificial-heart values projected 2014 earnings below estimates.
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—By CNBC's Kate Gibson.
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