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.
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.
QEP Resources The oil-exploration company fell after saying it would pay about $950 million for assets in the Permian Basin in Texas.
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.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Kate Gibson.
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